☆ 4.4 Article

Data Analysis for Precision 21 cm Cosmology

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC (2020)

期刊

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC

卷 132, 期 1012, 页码 -

出版社

IOP Publishing Ltd

DOI: 10.1088/1538-3873/ab5bfd

关键词

dark ages; reionization; first stars; methods; statistical; techniques; interferometric

类别

Astronomy & Astrophysics

资金

National Science Foundation [1836019]
New Frontiers in Research Fund Exploration grant program
Natural Sciences and Engineering Research Council of Canada (NSERC)
Canadian Institute for Advanced Research (CIFAR) Azrieli Global Scholars program
Direct For Mathematical & Physical Scien
Division Of Astronomical Sciences [1836019] Funding Source: National Science Foundation

向作者/读者索取更多资源

Protocol

Reagent

摘要

The redshifted 21 cm line is an emerging tool in cosmology, in principle permitting three-dimensional surveys of our universe that reach unprecedentedly large volumes, previously inaccessible length scales, and hitherto unexplored epochs of our cosmic timeline. Large radio telescopes have been constructed for this purpose, and in recent years there has been considerable progress in transforming 21 cm cosmology from a field of considerable theoretical promise to one of observational reality. Increasingly, practitioners in the field are coming to the realization that the success of observational 21 cm cosmology will hinge on software algorithms and analysis pipelines just as much as it does on careful hardware design and telescope construction. This review provides a pedagogical introduction to state-of-the-art ideas in 21 cm data analysis, covering a wide variety of steps in a typical analysis pipeline, from calibration to foreground subtraction to map making to power spectrum estimation to parameter estimation.

作者

我是这篇论文的作者

点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.4

评分不足

次要评分

新颖性

-

重要性

-

科学严谨性

-

评价这篇论文

推荐

Article Astronomy & Astrophysics

The first molecules in the intergalactic medium and halos of the Dark Ages and Cosmic Dawn

B. Novosyadlyj, Yu. Kulinich, B. Melekh, V. Shulga

Summary: This study examines the formation and destruction of the first molecules during the Dark Ages and Cosmic Dawn, evaluating the luminosity of protogalaxy clumps (halos) in molecular lines. The impact of photodissociation processes on molecules like H-2 and HD is significant before full reionization, while the number density of helium hydride ions HeH+ shows complicated dependences on halo kinetic temperature and models of the first light. The brightness temperature evolution of individual halos in rotational lines of certain molecules does not exceed microkelvin, but detection could provide important insights into physical processes during the formation of the first stars and galaxies.

ASTRONOMY & ASTROPHYSICS (2022)

添加到收藏夹

Article Multidisciplinary Sciences

The nature of an ultra-faint galaxy in the cosmic dark ages seen with JWST

Guido Roberts-Borsani, Tommaso Treu, Wenlei Chen, Takahiro Morishita, Eros Vanzella, Adi Zitrin, Pietro Bergamini, Marco Castellano, Adriano Fontana, Karl Glazebrook, Claudio Grillo, Patrick L. Kelly, Emiliano Merlin, Themiya Nanayakkara, Diego Paris, Piero Rosati, Lilan Yang, Ana Acebron, Andrea Bonchi, Kit Boyett, Marusa Bradac, Gabriel Brammer, Tom Broadhurst, Antonello Calabro, Jose M. Diego, Alan Dressler, Lukas J. Furtak, Alexei V. Filippenko, Alaina Henry, Anton M. Koekemoer, Nicha Leethochawalit, Matthew A. Malkan, Charlotte Mason, Amata Mercurio, Benjamin Metha, Laura Pentericci, Justin Pierel, Steven Rieck, Namrata Roy, Paola Santini, Victoria Strait, Robert Strausbaugh, Michele Trenti, Benedetta Vulcani, Lifan Wang, Xin Wang, Rogier A. Windhorst

Summary: In the early universe, sources of ultraviolet photons played a crucial role in ionizing intergalactic hydrogen, making the universe transparent to UV radiation. Fainter galaxies that are surrounded by neutral gas were believed to dominate the photon budget. By using the James Webb Space Telescope and gravitational lensing, the ultra-faint galaxy JD1 was spectroscopically confirmed at a redshift of z = 9.79, showing a compact and complex morphology with low stellar mass and subsolar metallicity.

NATURE (2023)

添加到收藏夹

Article Astronomy & Astrophysics

Characterizing beam errors for radio interferometric observations of reionization

Ainulnabilah Nasirudin, David Prelogovic, Steven G. Murray, Andrei Mesinger, Gianni Bernardi

Summary: This study focuses on the impact of chromaticity due to coupling between the sky and instrument in 21-cm interferometric experiments. By characterizing beam uncertainties using PCA and KPCA, it is shown that the residual of the beam can be reduced significantly compared to assuming an ideal beam. Simulated observations demonstrate that using PCA/KPCA to characterize beam uncertainties can greatly improve the accuracy of the power spectrum in the epoch of reionization window and the wedge of the 2D power spectrum.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)

添加到收藏夹

Article Astronomy & Astrophysics

Stability and pulsation of the first dark stars

Tanja Rindler-Daller, Katherine Freese, Richard H. D. Townsend, Luca Visinelli

Summary: This study investigates the properties and pulsation modes of dark stars, showing that acoustic modes in smaller dark stars are excited by mechanisms in layers with partially ionized hydrogen or helium. It also reveals that mass-loss rates potentially induced by pulsations are negligible compared to accretion rates.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

添加到收藏夹

Article Astronomy & Astrophysics

A Bayesian approach to high-fidelity interferometric calibration - I. Mathematical formalism

Peter H. Sims, Jonathan C. Pober, Jonathan L. Sievers

Summary: This paper introduces BAYESCAL, a novel solution for addressing the sky-model incompleteness problem in interferometric calibration, enabling high-fidelity data calibration. The BAYESCAL data model combines a statistical model for missing and uncertain flux contributions with a prior on the power in the model. The paper demonstrates the analytical marginalization of the model parameters, the use of physically motivated priors to constrain the calibration solutions, and the significant power suppression in spurious spectral fluctuations compared to standard calibration approaches.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)

添加到收藏夹

Article Astronomy & Astrophysics

Small-scale primordial fluctuations in the 21 cm Dark Ages signal

Philippa S. Cole, Joseph Silk

Summary: The production and existence of primordial black holes can impact the primordial power spectrum and matter power spectrum, potentially leading to observable effects on the 21 cm power spectrum. It is crucial to include the contribution from primordial fluctuations in predicting the 21 cm signal in order to avoid underestimation.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

添加到收藏夹

Article Astronomy & Astrophysics

Characterization of inpaint residuals in interferometric measurements of the epoch of reionization

Michael Pagano, Jing Liu, Adrian Liu, Nicholas S. Kern, Aaron Ewall-Wice, Philip Bull, Robert Pascua, Siamak Ravanbakhsh, Zara Abdurashidova, Tyrone Adams, James E. Aguirre, Paul Alexander, Zaki S. Ali, Rushelle Baartman, Yanga Balfour, Adam P. Beardsley, Gianni Bernardi, Tashalee S. Billings, Judd D. Bowman, Richard F. Bradley, Jacob Burba, Steven Carey, Chris L. Carilli, Carina Cheng, David R. DeBoer, Eloy de Lera Acedo, Matt Dexter, Joshua S. Dillon, Nico Eksteen, John Ely, Nicolas Fagnoni, Randall Fritz, Steven R. Furlanetto, Kingsley Gale-Sides, Brian Glendenning, Deepthi Gorthi, Bradley Greig, Jasper Grobbelaar, Ziyaad Halday, Bryna J. Hazelton, Jacqueline N. Hewitt, Jack Hickish, Daniel C. Jacobs, Austin Julius, MacCalvin Kariseb, Joshua Kerrigan, Piyanat Kittiwisit, Saul A. Kohn, Matthew Kolopanis, Adam Lanman, Paul La Plante, Anita Loots, David Harold Edward MacMahon, Lourence Malan, Cresshim Malgas, Keith Malgas, Bradley Marero, Zachary E. Martinot, Andrei Mesinger, Mathakane Molewa, Miguel F. Morales, Tshegofalang Mosiane, Abraham R. Neben, Bojan Nikolic, Hans Nuwegeld, Aaron R. Parsons, Nipanjana Patra, Samantha Pieterse, Nima Razavi-Ghods, James Robnett, Kathryn Rosie, Peter Sims, Craig Smith, Hilton Swarts, Nithyanandan Thyagarajan, Pieter van Wyngaarden, Peter K. G. Williams, Haoxuan Zheng

Summary: In this paper, we examine the errors introduced into the visibilities and power spectrum due to inpainting RFI, and present a convolutional neural network capable of inpainting RFI corrupted data. We find that techniques incorporating high wavenumbers in delay space are best suited for narrowband RFI, and Gaussian progress regression and least squares spectral analysis provide the best performance for larger RFI gaps.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

添加到收藏夹

Article Astronomy & Astrophysics

A Bayesian approach to high fidelity interferometric calibration - II: demonstration with simulated data

Peter H. Sims, Jonathan C. Pober, Jonathan L. Sievers

Summary: This paper presents bayescal, a mathematical formalism for mitigating sky-model incompleteness in interferometric calibration, and demonstrates its application in calibrating degenerate gain parameters. The results show that bayescal provides calibration solutions with lower power in spurious gain amplitude fluctuations and higher accuracy compared to alternative approaches, allowing for calibration across all spectral scales.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)

添加到收藏夹

Article Astronomy & Astrophysics

A comparison of quasar emission reconstruction techniques for z ≥ 5.0 Lyman α and Lyman β transmission

Sarah E. Bosman, Dominika Durovcikova, Frederick B. Davies, Anna-Christina Eilers

Summary: The reconstruction techniques for intrinsic quasar continua are crucial for studying Lyman alpha and Lyman beta transmission at high redshifts. Evaluation of various techniques reveals biases and uncertainties, with power-law extrapolation and certain PCA methods showing significant deviations. New PCA methods demonstrate improved accuracy, emphasizing the importance of systematic testing and training of continuum reconstruction techniques.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

添加到收藏夹

Article Astronomy & Astrophysics

Patterns of primary beam non-redundancy in close-packed 21cm array observations

Samir Choudhuri, Philip Bull, Hugh Garsden

Summary: In this study, the impact of differences in the primary beam response between antennas on redundantly calibrated interferometric visibilities was investigated. It was found that additional temporal structure is induced in the gain solutions when bright point sources pass through the beam. Signal loss due to decoherence effects may occur, but redundant calibration helps mitigate its impact.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

添加到收藏夹

Article Astronomy & Astrophysics

Probing the initial mass function of the first stars with transients

Alexandres Lazar, Volker Bromm

Summary: The first generation of stars, known as Population III stars, played a crucial role in shaping the early universe, and their formation and evolution depend on the initial mass function (IMF). However, the detailed IMF remains elusive due to a lack of direct observational constraints. This paper presents a framework to probe the Pop III IMF using high-redshift pair-instability supernovae (PISNe) and gamma-ray bursts (GRBs). The combination of these observations can provide more accurate constraints on the IMF. Future observations have the potential to further enhance our understanding of the IMF.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)

添加到收藏夹

Article Astronomy & Astrophysics

Using the sample variance of 21 cm maps as a tracer of the ionisation topology

A. Gorce, A. Hutter, J. R. Pritchard

Summary: By analyzing the redshift-evolution of the local variance, insights into the reionisation history and ionisation morphology can be gained, providing a promising tool to constrain the midpoint of reionisation and understand the ionising properties of early galaxies.

ASTRONOMY & ASTROPHYSICS (2021)

添加到收藏夹

Article Astronomy & Astrophysics

Characterizing the true descendants of the first stars

Irene Vanni, Stefania Salvadori, Asa Skuladottir, Martina Rossi, Ioanna Koutsouridou

Summary: This study aims to investigate whether all metal-poor stars are formed in environments polluted by the first generation of supernovae and at what level. The chemical abundances of an environment imprinted by a single first-generation supernova are studied, including the dependence on the initial mass and mixing of these stars, as well as the explosion energy of the supernova. The study also examines how subsequent generations of normal supernovae affect the chemical signatures of the first generation stars.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

添加到收藏夹

Article Astronomy & Astrophysics

Constraints on dark matter-neutrino interaction from 21-cm cosmology and forecasts on SKA1-Low

Antara Dey, Arnab Paul, Supratik Pal

Summary: In this article, we have thoroughly investigated the effects of dark matter and neutrino interaction on reionization history. We have constrained the interaction strength using 21-cm cosmology and found deviations from the standard non-interacting scenario. Comparison with existing observational constraints reveals that 21-cm observations are more effective in constraining the interaction strength by several orders of magnitude. We have also assessed the prospects of detecting such interaction in the upcoming 21-cm mission SKA1-Low through forecast analysis and error estimation.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

添加到收藏夹

Article Astronomy & Astrophysics

Relative baryon-dark matter velocities in cosmological zoom simulations

Luke Conaboy, Ilian T. Iliev, Anastasia Fialkov, Keri L. Dixon, David Sullivan

Summary: Supersonic relative motion affects the growth of small-scale structures. The inclusion of relative velocities in zoom simulations reduces the halo baryon fraction and delays the formation of star particles. It also suppresses the final stellar mass.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

添加到收藏夹

Article Astronomy & Astrophysics

Data processing pipeline for Tianlai experiment

S. Zuo, J. Li, Y. Li, D. Santanu, A. Stebbins, K. W. Masui, R. Shaw, J. Zhang, F. Wu, X. Chen

Summary: The Tianlai project aims to detect dark energy through 21 cm intensity mapping experiment, facing challenges in data processing and signal extraction; The tlpipe software is developed for processing experiment data and includes various functions and new algorithms; Future developments of the publicly available code are outlined for further improvement.

ASTRONOMY AND COMPUTING (2021)

添加到收藏夹

Article Astronomy & Astrophysics

Systematic uncertainties in models of the cosmic dawn

Jordan Mirocha, Henri Lamarre, Adrian Liu

Summary: Models for the reionization and thermal histories of the intergalactic medium are becoming more sophisticated, but there are potential sources of systematic uncertainty that could bias upcoming measurements. Uncertainties in cosmology have a minor impact on optical depth and the amplitude of the global 21-cm signal, while differences in halo mass function and stellar population synthesis models have a more significant effect. Efforts are needed to reduce modeling uncertainties to enable precise inference with future data sets.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

添加到收藏夹

Article Astronomy & Astrophysics

Methods of Error Estimation for Delay Power Spectra in 21 cm Cosmology

Jianrong Tan, Adrian Liu, Nicholas S. Kern, Zara Abdurashidova, James E. Aguirre, Paul Alexander, Zaki S. Ali, Yanga Balfour, Adam P. Beardsley, Gianni Bernardi, Tashalee S. Billings, Judd D. Bowman, Richard F. Bradley, Philip Bull, Jacob Burba, Steven Carey, Christopher L. Carilli, Carina Cheng, David R. DeBoer, Matt Dexter, Eloy de Lera Acedo, Joshua S. Dillon, John Ely, Aaron Ewall-Wice, Nicolas Fagnoni, Randall Fritz, Steve R. Furlanetto, Kingsley Gale-Sides, Brian Glendenning, Deepthi Gorthi, Bradley Greig, Jasper Grobbelaar, Ziyaad Halday, Bryna J. Hazelton, Jacqueline N. Hewitt, Jack Hickish, Daniel C. Jacobs, Austin Julius, Joshua Kerrigan, Piyanat Kittiwisit, Saul A. Kohn, Matthew Kolopanis, Adam Lanman, Paul La Plante, Telalo Lekalake, David MacMahon, Lourence Malan, Cresshim Malgas, Matthys Maree, Zachary E. Martinot, Eunice Matsetela, Andrei Mesinger, Mathakane Molewa, Miguel F. Morales, Tshegofalang Mosiane, Steven G. Murray, Abraham R. Neben, Bojan Nikolic, Chuneeta D. Nunhokee, Aaron R. Parsons, Nipanjana Patra, Samantha Pieterse, Jonathan C. Pober, Nima Razavi-Ghods, Jon Ringuette, James Robnett, Kathryn Rosie, Peter Sims, Saurabh Singh, Craig Smith, Angelo Syce, Nithyanandan Thyagarajan, Peter K. G. Williams, Haoxuan Zheng

Summary: Researchers critically examine different methods for estimating error bars on the power spectrum, finding good agreement in the noise-dominated regime and consistent predicted probability distribution functions with simulated and real data. These findings will support the upcoming HERA upper limit and have broader applications.

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES (2021)

添加到收藏夹

Article Astronomy & Astrophysics

Lyman-alpha emitters and the 21 cm power spectrum as probes of density-ionization correlation in the epoch of reionization

Michael Pagano, Adrian Liu

Summary: This study investigates the morphology of the EoR through observations of LAEs at z = 6.6 and finds that additional information regarding number density and ACF can help distinguish between different density-ionization models. The research suggests that combining measurements of LAEs with 21 cm power spectrum data can rule out certain reionization models with high credibility.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

添加到收藏夹

Article Astronomy & Astrophysics

The importance of galaxy formation histories in models of reionization

Jordan Mirocha, Paul La Plante, Adrian Liu

Summary: This research explores how resolving and modeling individual galaxy formation histories impacts upcoming galaxy surveys and 21-cm experiments, finding biases in assuming galaxy luminosity is solely determined by halo mass. Diversity in galaxy formation histories also affects attempts to detect the 21-cm background via cross-correlation. Additionally, a hybrid approach is proposed as a viable way to generate large-volume simulations for wide-area surveys and current-generation 21-cm experiments targeting specific scales.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

添加到收藏夹

Article Engineering, Aerospace

Hydrogen Intensity and Real-Time Analysis Experiment: 256-element array status and overview

Devin Crichton, Moumita Aich, Adam Amara, Kevin Bandura, Bruce A. Bassett, Carlos Bengaly, Pascale Berner, Shruti Bhatporia, Martin Bucher, Tzu-Ching Chang, H. Cynthia Chiang, Jean-Francois Cliche, Carolyn Crichton, Romeel Dave, Dirk I. L. De Villiers, Matt Dobbs, Aaron M. Ewall-Wice, Scott Eyono, Christopher Finlay, Sindhu Gaddam, Ken Ganga, Kevin G. Gayley, Kit Gerodias, Tim B. Gibbon, Austine Gumba, Neeraj Gupta, Maile Harris, Heiko Heilgendorff, Matt Hilton, Adam D. Hincks, Pascal Hitz, Mona Jalilvand, Roufurd P. M. Julie, Zahra Kader, Joseph Kania, Dionysios Karagiannis, Aris Karastergiou, Kabelo Kesebonye, Piyanat Kittiwisit, Jean-Paul Kneib, Kenda Knowles, Emily R. Kuhn, Martin Kunz, Roy Maartens, Vincent MacKay, Stuart MacPherson, Christian Monstein, Kavilan Moodley, V Mugundhan, Warren Naidoo, Arun Naidu, Laura B. Newburgh, Viraj Nistane, Amanda Di Nitto, Deniz Olcek, Xinyu Pan, Sourabh Paul, Jeffrey B. Peterson, Elizabeth Pieters, Carla Pieterse, Aritha Pillay, Anna R. Polish, Liantsoa Randrianjanahary, Alexandre Refregier, Andre Renard, Edwin Retana-Montenegro, Ian H. Rout, Cyndie Russeeawon, Alireza Vafaei Sadr, Benjamin R. B. Saliwanchik, Ajith Sampath, Pranav Sanghavi, Mario G. Santos, Onkabetse Sengate, J. Richard Shawa, Jonathan L. Sievers, Oleg M. Smirnov, Kendrick M. Smith, Ulrich Armel Mbou Sob, Raghunathan Srianand, Pieter Stronkhorst, Dhaneshwar D. Sunder, Simon Tartakovsky, Russ Taylor, Peter Timbie, Emma E. Tolley, Junaid Townsend, Will Tyndall, Cornelius Ungerer, Jacques van Dyk, Gary van Vuuren, Keith Vanderlinde, Thierry Viant, Anthony Walters, Jingying Wang, Amanda Weltman, Patrick Woudt, Dallas Wulf, Anatoly Zavyalov, Zheng Zhang

Summary: HIRAX is a radio interferometer array that conducts a cosmological survey of the distribution of large-scale structure through intensity mapping of the 21 cm emission line of neutral hydrogen. It provides constraints on the dark energy equation of state parameter and enables studies on radio transient and HI absorber science.

JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS (2022)

添加到收藏夹

Article Astronomy & Astrophysics

On the Use of CHIME to Detect Long-duration Radio Transients from Neutron Star Mergers

Minori Shikauchi, Kipp Cannon, Haoxiang Lin, Tomonori Totani, J. Richard Shaw

Summary: This study considers a more sophisticated detection algorithm for short gamma-ray burst (SGRB) afterglows and provides an estimate of the trials factors for a realistic search using the Canadian Hydrogen Intensity Mapping Experiment (CHIME). The research suggests that CHIME can detect 893 and 312 afterglows per year using different jet models, with a majority of the afterglows being off axis.

ASTROPHYSICAL JOURNAL (2022)

添加到收藏夹

Article Astronomy & Astrophysics

A galaxy-free phenomenological model for the 21-cm power spectrum during reionization

Jordan Mirocha, Julian B. Munoz, Steven R. Furlanetto, Adrian Liu, Andrei Mesinger

Summary: This paper investigates the inference of the Epoch of Reionization (EoR) models using the 21-cm signal. The authors propose a simplified phenomenological model for the intergalactic medium (IGM) properties and validate its effectiveness through simulated data. The results suggest that comparable constraints on the IGM can be obtained using models with very different assumptions.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)

添加到收藏夹

Article Astronomy & Astrophysics

Using the Sun to Measure the Primary Beam Response of the Canadian Hydrogen Intensity Mapping Experiment

Mandana Amiri, Kevin Bandura, Anja Boskovic, Jean-Francois Cliche, Meiling Deng, Matt Dobbs, Mateus Fandino, Simon Foreman, Mark Halpern, Alex S. Hill, Gary Hinshaw, Carolin Hofer, Joseph Kania, T. L. Landecker, Joshua MacEachern, Kiyoshi Masui, Juan Mena-Parra, Laura Newburgh, Anna Ordog, Tristan Pinsonneault-Marotte, Ava Polzin, Alex Reda, J. Richard Shaw, Seth R. Siegel, Saurabh Singh, Keith Vanderlinde, Haochen Wang, James S. Willis, Dallas Wulf

Summary: This study presents a beam pattern measurement of the CHIME instrument using the Sun as a calibration source. By relying on the motion of the Sun, the authors were able to measure the beam at different elevations without moving the telescope. The data obtained near solar minimum showed minimal impact from solar variability, making it highly complementary to other CHIME beam measurements.

ASTROPHYSICAL JOURNAL (2022)

添加到收藏夹

Article Astronomy & Astrophysics

An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment

Mandana Amiri, Kevin Bandura, Anja Boskovic, Tianyue Chen, Jean-Francois Cliche, Meiling Deng, Nolan Denman, Matt Dobbs, Mateus Fandino, Simon Foreman, Mark Halpern, David Hanna, Alex S. Hill, Gary Hinshaw, Carolin Hofer, Joseph Kania, Peter Klages, T. L. Landecker, Joshua MacEachern, Kiyoshi Masui, Juan Mena-Parra, Nikola Milutinovic, Arash Mirhosseini, Laura Newburgh, Rick Nitsche, Anna Ordog, Ue-Li Pen, Tristan Pinsonneault-Marotte, Ava Polzin, Alex Reda, Andre Renard, J. Richard Shaw, Seth R. Siegel, Saurabh Singh, Rick Smegal, Ian Tretyakov, Kwinten Van Gassen, Keith Vanderlinde, Haochen Wang, Donald Wiebe, James S. Willis, Dallas Wulf

Summary: The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a drift scan radio telescope designed to map neutral hydrogen and constrain the expansion history of the universe. CHIME consists of four parallel cylindrical reflectors and a 256-element dual-polarization linear feed array. It utilizes an FX correlator to digitize and correlate signals, generating different correlation products for various purposes. The instrument's performance has been evaluated based on three years of science data, and progress has been made in characterizing CHIME's primary beam response.

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES (2022)

添加到收藏夹

Article Multidisciplinary Sciences

Sub-second periodicity in a fast radio burst

Bridget C. Andersen, Kevin Bandura, Mohit Bhardwaj, P. J. Boyle, Charanjot Brar, Daniela Breitman, Tomas Cassanelli, Shami Chatterjee, Pragya Chawla, Jean-Francois Cliche, Davor Cubranic, Alice P. Curtin, Meiling Deng, Matt Dobbs, Fengqiu Adam Dong, Emmanuel Fonseca, B. M. Gaensler, Utkarsh Giri, Deborah C. Good, Alex S. Hill, Alexander Josephy, J. F. Kaczmarek, Zarif Kader, Joseph Kania, Victoria M. Kaspi, Calvin Leung, D. Z. Li, Hsiu-Hsien Lin, Kiyoshi W. Masui, Ryan Mckinven, Juan Mena-Parra, Marcus Merryfield, B. W. Meyers, D. Michilli, Arun Naidu, Laura Newburgh, C. Ng, Anna Ordog, Chitrang Patel, Aaron B. Pearlman, Ue-Li Pen, Emily Petroff, Ziggy Pleunis, Masoud Rafiei-Ravandi, Mubdi Rahman, Scott Ransom, Andre Renard, Pranav Sanghavi, Paul Scholz, J. Richard Shaw, Kaitlyn Shin, Seth R. Siegel, Saurabh Singh, Kendrick Smith, Ingrid Stairs, Chia Min Tan, Shriharsh P. Tendulkar, Keith Vanderlinde, D. V. Wiebe, Dallas Wulf, Andrew Zwaniga

Summary: This study reports the detection of the multicomponent FRB 20191221A and identifies a periodic separation of 216.8 ms between its components, providing strong evidence for a neutron-star origin of the event. The results also support the hypothesis of emission arising from the neutron-star magnetosphere.

NATURE (2022)

添加到收藏夹

Article Astronomy & Astrophysics

Signatures of reionization feedback in the near-infrared background

Jordan Mirocha, Adrian Liu, Paul La Plante

Summary: The reionization of the intergalactic medium has a lasting impact on galaxies in low-mass dark matter haloes, causing a turnover in the galaxy luminosity function. This impact can be constrained by measuring the cosmic near-infrared background (NIRB).

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)

添加到收藏夹

Article Astronomy & Astrophysics

Impact of instrument and data characteristics in the interferometric reconstruction of the 21cm power spectrum

Adelie Gorce, Samskruthi Ganjam, Adrian Liu, Steven G. Murray, Zara Abdurashidova, Tyrone Adams, James E. Aguirre, Paul Alexander, Zaki S. Ali, Rushelle Baartman, Yanga Balfour, Adam P. Beardsley, Gianni Bernardi, Tashalee S. Billings, Judd D. Bowman, Richard E. Bradley, Philip Bull, Jacob Burba, Steven Carey, Chris L. Carilli, Carina Cheng, David R. DeBoer, Eloy de Lera Acedo, Matt Dexter, Joshua S. Dillon, Nico Eksteen, John Ely, Aaron Ewall-Wice, Nicolas Fagnoni, Randall Fritz, Steven R. Furlanetto, Kingsley Gale-Sides, Brian Glendenning, Deepthi Gorthi, Bradley Greig, Jasper Grobbelaar, Ziyaad Halday, Bryna J. Hazelton, Jacqueline N. Hewitt, Jack Hickish, Daniel C. Jacobs, Austin Julius, MacCalvin Kariseb, Nicholas S. Kern, Joshua Kerrigan, Piyanat Kittiwisit, Saul A. Kohn, Matthew Kolopanis, Adam Lanman, Paul La Plante, Anita Loots, David Harold Edward MacMahon, Lourence Malan, Cresshim Malgas, Keith Malgas, Bradley Marero, Zachary E. Martinot, Andrei Mesinger, Mathakane Molewa, Miguel E. Morales, Tshegofalang Mosiane, Abraham R. Neben, Bojan Nikolic, Hans Nuwegeld, Aaron R. Parsons, Nipanjana Patra, Samantha Pieterse, Jonathan C. Pober, Nima Razavi-Ghods, James Robnett, Kathryn Rosie, Peter Sims, Hilton Swarts, Nithyanandan Thyagarajan, Pieter van Wyngaarden, Peter K. G. Williams, Haoxuan Zheng

Summary: Combining visibilities measured by an interferometer to form a cosmological power spectrum is a complicated process. The mapping between instrumental and cosmological space is not one-to-one, with neighbouring modes contributing to the measured power and their contributions encoded in window functions. This study assesses how instrument characteristics and analysis choices impact these window functions, focusing on the Hydrogen Epoch of Reionization Array (HERA). The results show the importance of long-baseline observations and informed choices of bandwidth and frequency taper in reducing foreground leakage and accurately reconstructing the power spectrum.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

添加到收藏夹

Article Astronomy & Astrophysics

Characterization of inpaint residuals in interferometric measurements of the epoch of reionization

Michael Pagano, Jing Liu, Adrian Liu, Nicholas S. Kern, Aaron Ewall-Wice, Philip Bull, Robert Pascua, Siamak Ravanbakhsh, Zara Abdurashidova, Tyrone Adams, James E. Aguirre, Paul Alexander, Zaki S. Ali, Rushelle Baartman, Yanga Balfour, Adam P. Beardsley, Gianni Bernardi, Tashalee S. Billings, Judd D. Bowman, Richard F. Bradley, Jacob Burba, Steven Carey, Chris L. Carilli, Carina Cheng, David R. DeBoer, Eloy de Lera Acedo, Matt Dexter, Joshua S. Dillon, Nico Eksteen, John Ely, Nicolas Fagnoni, Randall Fritz, Steven R. Furlanetto, Kingsley Gale-Sides, Brian Glendenning, Deepthi Gorthi, Bradley Greig, Jasper Grobbelaar, Ziyaad Halday, Bryna J. Hazelton, Jacqueline N. Hewitt, Jack Hickish, Daniel C. Jacobs, Austin Julius, MacCalvin Kariseb, Joshua Kerrigan, Piyanat Kittiwisit, Saul A. Kohn, Matthew Kolopanis, Adam Lanman, Paul La Plante, Anita Loots, David Harold Edward MacMahon, Lourence Malan, Cresshim Malgas, Keith Malgas, Bradley Marero, Zachary E. Martinot, Andrei Mesinger, Mathakane Molewa, Miguel F. Morales, Tshegofalang Mosiane, Abraham R. Neben, Bojan Nikolic, Hans Nuwegeld, Aaron R. Parsons, Nipanjana Patra, Samantha Pieterse, Nima Razavi-Ghods, James Robnett, Kathryn Rosie, Peter Sims, Craig Smith, Hilton Swarts, Nithyanandan Thyagarajan, Pieter van Wyngaarden, Peter K. G. Williams, Haoxuan Zheng

Summary: In this paper, we examine the errors introduced into the visibilities and power spectrum due to inpainting RFI, and present a convolutional neural network capable of inpainting RFI corrupted data. We find that techniques incorporating high wavenumbers in delay space are best suited for narrowband RFI, and Gaussian progress regression and least squares spectral analysis provide the best performance for larger RFI gaps.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

添加到收藏夹

Article Astronomy & Astrophysics

Joint constraints on reionization: A framework for combining the global 21 cm signal and the kinetic Sunyaev-Zel'dovich effect

Joelle-Marie Begin, Adrian Liu, Adelie Gorce

Summary: Combining the 21 cm global signal and kinetic Sunyaev-Zel'dovich effect for reconstructing the ionization history provides more precise results compared to individual constraints. Carefully chosen, physically motivated priors are crucial in obtaining bias-free reconstruction. The two probes are complementary and can be used to detect systematics in each other, safeguarding against biases.

PHYSICAL REVIEW D (2022)

添加到收藏夹

暂无数据

© Peeref 2019-2024. All rights reserved.