Article
Astronomy & Astrophysics
Zachary Hafen, Jonathan Stern, James Bullock, Alexander B. Gurvich, Sijie Yu, Claude-Andre Faucher-Giguere, Drummond B. Fielding, Daniel Angles-Alcazar, Eliot Quataert, Andrew Wetzel, Tjitske Starkenburg, Michael Boylan-Kolchin, Jorge Moreno, Robert Feldmann, Kareem El-Badry, T. K. Chan, Cameron Trapp, Dusan Keres, Philip F. Hopkins
Summary: The study suggests that a key factor in the formation of thin stellar discs in Milky Way-mass galaxies is the aligned angular momentum distribution of accreting gas before joining the galaxy; galaxies with a thick disc or irregular morphology lack gas angular momentum alignment. Simulation results indicate a strong correlation between rotating cooling flow accretion mode and thin disc galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Cesar Hernandez-Aguayo, Christian Arnold, Baojiu Li, Carlton M. Baugh
Summary: In this study, 'full-physics' hydrodynamical simulations of galaxy formation in the nDGP braneworld model were conducted to investigate the impact of baryonic physics on galactic scales and make predictions on the stellar content of dark matter haloes and galaxy evolution. Significant differences between general relativity and nDGP models were found in the power spectra and correlation functions of gas, stars, and dark matter, with baryonic effects influencing the overall matter distribution clustering. The study also revealed that the effects of modified gravity and galactic feedback on matter clustering can be distinctly separated, allowing for accurate prediction of the matter power spectrum with baryonic effects included.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Daniele Sorini, John A. Peacock
Summary: The revised and extended analytical model for cosmic star formation, with modifications to make it more general, successfully reproduces observed features and history of star formation in the universe. The simplified apparatus not only has pedagogical value but also serves as a means for rapid exploration of non-standard cosmological models.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Fred Angelo Batan Garcia, Massimo Ricotti, Kazuyuki Sugimura, Jongwon Park
Summary: Using radiation-hydrodynamic cosmological simulations, the study presents a detailed description of a typical-mass dwarf galaxy before the epoch of reionization, revealing the formation and evolution of star clusters into individual star particles. The galaxy has an irregular morphology dominated by light emitted from numerous, compact, and gravitationally-bound star clusters. The study also discusses the star-forming gas clouds in the galaxy and their potential to produce globular cluster progenitors.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Antonios Katsianis, Haojie Xu, Xiaohu Yang, Yu Luo, Weiguang Cui, Romeel Dave, Claudia Del P. Lagos, Xianzhong Zheng, Ping Zhao
Summary: The study presents the corrected specific star formation rate function (sSFRF) at different stellar mass scales and explores the distribution of passive/star-forming galaxies, finding a bimodality in sSFRF that is not replicated in some cosmological simulations. The findings reflect the necessity to reconsider the quenching schemes in state-of-the-art models, suggesting the need for prescriptions that allow quenched galaxies to exhibit some level of star formation activity.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Daniel Montenegro-Taborda, Vicente Rodriguez-Gomez, Annalisa Pillepich, Vladimir Avila-Reese, Laura V. Sales, Aldo Rodriguez-Puebla, Lars Hernquist
Summary: We investigate the formation of brightest cluster galaxies (BCGs) in the TNG300 cosmological simulation of the IllustrisTNG project. Our simulated BCGs are in good agreement with observations in terms of stellar masses and star formation rates at z ? 0.4, and have experienced multiple major mergers since z = 1 (z = 2). The majority of the stellar mass of BCGs, BCG + ICL, and ICL at z = 0 is contributed by ex situ (accreted) stars, with approximately 70%, 80%, and 90% respectively. The stellar mass profiles of BCGs are dominated by ex situ stars at all radii, with major merger stars closer to the center and tidally stripped stars from other galaxies dominating the outer regions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Qirong Zhu, Yuexing Li, Yiting Li, Moupiya Maji, Hidenobu Yajima, Raffaella Schneider, Lars Hernquist
Summary: By conducting zoom-in simulations on black hole seeds in star systems, it is found that abundant gas supply and efficient angular momentum transport through gravitational torques are crucial for black hole accretion. The final black hole mass depends on the seed mass and radiative efficiency, and seeds with a mass of at least 10^4 solar masses can rapidly grow to become supermassive black holes in both thin and slim disc accretion models.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Steven R. Furlanetto, Jordan Mirocha
Summary: In recent years, analytic models have shown that simple assumptions about halo growth and feedback-regulated star formation can match existing observational data on galaxies at z >= 6. By extending these models, it has been demonstrated that stellar feedback time delay caused by supernova explosions leads to burstiness in small galaxies. However, these burst cycles damp out quickly in massive galaxies due to their ability to resist feedback.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Boon Kiat Oh, John A. Peacock, Sadegh Khochfar, Britton D. Smith
Summary: The study presents interesting phenomena in cosmological simulations extended to redshift z approximately -0.99 or beyond, including the freeze out in the halo mass function, evolution of the equation of state of the intergalactic medium, and future behavior of cosmic star formation history. Predictions were also made about the partition of baryons within a Milky Way-sized galaxy in the future.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Boon Kiat Oh, John A. Peacock, Sadegh Khochfar, Britton D. Smith
Summary: This study compares the standard Lambda cold dark matter cosmology with counterfactual universes through simulations and explores the effects of Lambda and fluctuation amplitude on the evolution of the halo mass function, intergalactic medium, and star formation history. The results show that the peak and decline in star formation rate density are both influenced by the interplay between gravitational attraction and the accelerating effects of Lambda. The cooling of the intergalactic medium is faster in models with larger Lambda and lower sigma(8), resulting in reduced star formation rate density.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Hakim Atek, Lukas J. Furtak, Pascal Oesch, Pieter van Dokkum, Naveen Reddy, Thierry Contini, Garth Illingworth, Stephen Wilkins
Summary: We investigate the burstiness of star formation and the ionizing efficiency of a large sample of galaxies at 0.7 < z < 1.5 using HST grism spectroscopy and deep ultraviolet (UV) imaging. Our findings suggest that the burstiness parameters of these strong emission-line galaxies may differ from previous observations and simulations. We also observe an increase of ionizing photon production efficiency with redshift, further confirming similar results at higher redshifts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Robert J. McGibbon, Sadegh Khochfar
Summary: We present a novel machine learning method for predicting the baryonic properties of dark matter only subhaloes. Our new model outperforms previous models and reveals the different importance of input features for predicting various properties. We also find that nurture plays a more significant role than nature in determining the physical properties of galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Mengtao Tang, Daniel P. Stark, Richard S. Ellis
Summary: As the James Webb Space Telescope approaches scientific operation, there is much interest in exploring the redshift range beyond that accessible with Hubble Space Telescope imaging. Currently, the only means to gauge the presence of such early galaxies is to age-date the stellar population of systems in the reionisation era. However, a spectroscopic study reveals that the previously believed genuinely young systems may have higher dynamical masses than expected.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Antonios Katsianis, Xiaohu Yang, Matthew Fong, Jie Wang
Summary: We propose a physical model that explains the mass accretion histories of haloes based on the observed cosmic star formation rate density. Our model uses a Gamma functional form to describe the mass histories and considers parameters such as halo mass, time, and the percentage of mass at present time with respect to the final mass. We validate our model using cosmological simulations and analytical models of halo mass histories. Our results indicate that smaller haloes have already reached a significant portion of their final mass, and the average parameter suggests that the cosmic mass accretion history/cosmic star formation rate density is saturated at our present era. Finally, we estimate that the co-evolution/growth of galaxies and haloes occurred between 150-300 million years after the Big Bang.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Alejandra Aguirre-Santaella, Miguel A. Sanchez-Conde, Go Ogiya, Jens Stucker, Raul E. Angulo
Summary: This study utilized specially designed numerical simulations to explore the survival of dark matter subhaloes in the Milky Way, finding that most subhaloes survive until present but losing significant amounts of their initial mass. The presence of baryons in the host leads to greater mass-loss in subhaloes, especially when the orbit is more parallel to the Galactic disc.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Cathryn M. Trott, C. H. Jordan, S. Midgley, N. Barry, B. Greig, B. Pindor, J. H. Cook, G. Sleap, S. J. Tingay, D. Ung, P. Hancock, A. Williams, J. Bowman, R. Byrne, A. Chokshi, B. J. Hazelton, K. Hasegawa, D. Jacobs, R. C. Joseph, W. Li, J. L. B. Line, C. Lynch, B. McKinley, D. A. Mitchell, M. F. Morales, M. Ouchi, J. C. Pober, M. Rahimi, K. Takahashi, R. B. Wayth, R. L. Webster, M. Wilensky, J. S. B. Wyithe, S. Yoshiura, Z. Zhang, Q. Zheng
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
Madeline A. Marshall, Simon J. Mutch, Yuxiang Qin, Gregory B. Poole, J. Stuart B. Wyithe
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
Yisheng Qiu, Simon J. Mutch, Pascal J. Elahi, Rhys J. J. Poulton, Chris Power, J. Stuart B. Wyithe
Summary: This article discusses the importance of resolving faint galaxies in large volumes for accurate cosmic reionization simulations. It introduces the extension of mass resolution in N-body simulations using a Monte Carlo algorithm and proposes a method to evolve positions of Monte Carlo haloes. The results show improvements in predictions on stellar mass functions, star formation rate densities, and volume-weighted neutral fractions in the semi-analytic reionization model with extended halo catalogues.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Madeline A. Marshall, J. Stuart B. Wyithe, Rogier A. Windhorst, Tiziana Di Matteo, Yueying Ni, Stephen Wilkins, Rupert A. C. Croft, Mira Mechtley
Summary: The study investigates the detectability of host galaxies of high-redshift quasars using mock images and PSF modeling, predicting that JWST NIRCam imaging can detect around 50% of quasar host galaxies. Different observational strategies are explored, with NIRCam wide-band imaging in long-wavelength filters showing the highest fraction of successful quasar host detections. Longer exposure times are required for detecting the majority of host galaxies, with 5 ks exposures being optimal for NIRCam wide-band filters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
C. M. Trott, C. H. Jordan, J. L. B. Line, C. R. Lynch, S. Yoshiura, B. McKinley, P. Dayal, B. Pindor, A. Hutter, K. Takahashi, R. B. Wayth, N. Barry, A. Beardsley, J. Bowman, R. Byrne, A. Chokshi, B. Greig, K. Hasegawa, B. J. Hazelton, E. Howard, D. Jacobs, M. Kolopanis, D. A. Mitchell, M. F. Morales, S. Murray, J. C. Pober, M. Rahimi, S. J. Tingay, R. L. Webster, M. Wilensky, J. S. B. Wyithe, Q. Zheng
Summary: This study uses neutral hydrogen mapping to constrain the brightness temperature of the Universe at the end of the Epoch of Reionization, providing prior information not available through other methods. By using observations from MWA and data on detected LAEs, the study successfully predicts the neutral hydrogen signal, demonstrates the ability to detect brightness temperature fluctuations, and places constraints on Hii bubble sizes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. Rahimi, B. Pindor, J. L. B. Line, N. Barry, C. M. Trott, R. L. Webster, C. H. Jordan, M. Wilensky, S. Yoshiura, A. Beardsley, J. Bowman, R. Byrne, A. Chokshi, B. J. Hazelton, K. Hasegawa, E. Howard, B. Greig, D. Jacobs, R. Joseph, M. Kolopanis, C. Lynch, B. McKinley, D. A. Mitchell, S. Murray, M. F. Morales, J. C. Pober, K. Takahashi, S. J. Tingay, R. B. Wayth, J. S. B. Wyithe, Q. Zheng
Summary: This study focuses on analyzing the EoR1 field and deals with challenges posed by the presence of the bright radio galaxy Fornax-A. By improving source models, analysis algorithms, and data quality metrics, the study has successfully enhanced the upper limit measurements of the EoR power spectrum, demonstrating promising results for future research.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Yuxiang Qin, J. Stuart B. Wyithe, Pascal A. Oesch, Garth D. Illingworth, Ecaterina Leonova, Simon J. Mutch, Rohan P. Naidu
Summary: This study investigates the Ly alpha IGM transmission and environment of bright galaxies during the epoch of reionization. It reveals that brighter galaxies are less affected by damping-wing absorption, while the transmission of fainter galaxies depends on UV luminosity. The brightest sources are located in the largest ionized regions, leading to a lower incidence of Ly alpha detection in fainter galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Rogier A. Windhorst, Seth H. Cohen, Rolf A. Jansen, Jake Summers, Scott Tompkins, Christopher J. Conselice, Simon P. Driver, Haojing Yan, Dan Coe, Brenda Frye, Norman Grogin, Anton Koekemoer, Madeline A. Marshall, Rosalia O'Brien, Nor Pirzkal, Aaron Robotham, Russell E. Ryan, Christopher N. A. Willmer, Timothy Carleton, Jose M. Diego, William C. Keel, Paolo Porto, Caleb Redshaw, Sydney Scheller, Stephen M. Wilkins, S. P. Willner, Adi Zitrin, Nathan J. Adams, Duncan Austin, Richard G. Arendt, John F. Beacom, Rachana A. Bhatawdekar, Larry D. Bradley, Tom Broadhurst, Cheng Cheng, Francesca Civano, Liang Dai, Herve Dole, Jordan C. J. D'Silva, Kenneth J. Duncan, Giovanni G. Fazio, Giovanni Ferrami, Leonardo Ferreira, Steven L. Finkelstein, Lukas J. Furtak, Hansung B. Gim, Alex Griffiths, Heidi B. Hammel, Kevin C. Harrington, Nimish P. Hathi, Benne W. Holwerda, Rachel Honor, Jia-Sheng Huang, Minhee Hyun, Myungshin Im, Bhavin A. Joshi, Patrick S. Kamieneski, Patrick Kelly, Rebecca L. Larson, Juno Li, Jeremy Lim, Zhiyuan Ma, Peter Maksym, Giorgio Manzoni, Ashish Kumar Meena, Stefanie N. Milam, Mario Nonino, Massimo Pascale, Andreea Petric, Justin D. R. Pierel, Maria del Carmen Polletta, Huub J. A. Roettgering, Michael J. Rutkowski, Ian Smail, Amber N. Straughn, Louis-Gregory Strolger, Andi Swirbul, James A. A. Trussler, Lifan Wang, Brian Welch, J. Stuart B. Wyithe, Min Yun, Erik Zackrisson, Jiashuo Zhang, Xiurui Zhao
Summary: This paper provides an overview and details the rationale, methods, and initial findings of the PEARLS project, which utilizes NIRCam images to survey extragalactic areas. The project aims to study galaxy assembly, AGN growth, and First Light, and is expected to contribute significant insights to the field of astronomy.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
William C. C. Keel, Rogier A. A. Windhorst, Rolf A. A. Jansen, Seth H. H. Cohen, Jake Summers, Benne Holwerda, Sarah T. T. Bradford, Clayton D. D. Robertson, Giovanni Ferrami, Stuart Wyithe, Haojing Yan, Christopher J. J. Conselice, Simon P. P. Driver, Aaron Robotham, Norman A. A. Grogin, Christopher N. A. Willmer, Anton M. M. Koekemoer, Brenda L. L. Frye, Nimish P. P. Hathi, Russell E. E. Ryan Jr, Nor Pirzkal, Madeline A. A. Marshall, Dan Coe, Jose M. M. Diego, Thomas J. J. Broadhurst, Michael J. J. Rutkowski, Lifan Wang, S. P. Willner, Andreea Petric, Cheng Cheng, Adi Zitrin
Summary: We measured the spatial and wavelength behavior of dust attenuation in the multiple-armed spiral galaxy VV 191b using backlighting by the superimposed elliptical system VV 191a. The imaging data revealed the attenuation profiles and coverage statistics in different wavelength bands, showing a stronger reddening behavior and a power-law extinction behavior with different slopes at different wavelengths. These results indicate a different grain population compared to our vicinity.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
G. Ferrami, J. Stuart B. Wyithe
Summary: We study the effect of finite source size on the magnification bias of high-redshift galaxies and find that it significantly suppresses the magnification bias, resulting in a steeper decline of the observed bright end of the luminosity function compared to the assumption of point sources. By comparing with observational data, we show that the UVLF can provide constraints on the intrinsic size of galaxies, favoring smaller galaxies compared to the fiducial luminosity-size relation. Wide surveys with Euclid and Roman Space Telescope will provide stronger constraints in the future. We also determine the maximum possible magnification as a function of source size and lens ellipticity.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
James E. Davies, Rupert A. C. Croft, Tiziana Di-Matteo, Bradley Greig, Yu Feng, J. Stuart B. Wyithe
Summary: The study uses BLUETIDES simulation to investigate the measurement of ionized regions around bright galaxies at the beginning of reionization. They find that with proper foreground subtraction, a 5 sigma detection of these regions can be made with 30 images around some of the brightest galaxies in the simulation. Additionally, the study shows that reducing foreground contamination in Fourier space can significantly improve the detection of ionized regions at redshift z=9.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Bradley Greig, Cathryn M. Trott, Nichole Barry, Simon J. Mutch, Bart Pindor, Rachel L. Webster, J. Stuart B. Wyithe
Summary: By utilizing the latest multiredshift upper limits on the 21-cm signal from the Murchison Widefield Array, disfavoured astrophysical models have been explored, with the majority found to be inconsistent with existing observational constraints. Interestingly, some models inconsistent with the MWA seem to align with other constraints, excluding X-ray emissivity, indicating the unique information provided by the current MWA limits. The study also presents the first limits on the soft-band X-ray emissivity from galaxies at high redshifts, as well as disfavoured limits on the IGM spin temperature.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Adi Zitrin, Ana Acebron, Dan Coe, Patrick L. Kelly, Anton M. Koekemoer, Mario Nonino, Rogier A. Windhorst, Brenda Frye, Massimo Pascale, Tom Broadhurst, Seth H. Cohen, Jose M. Diego, Steven L. Finkelstein, Rolf A. Jansen, Rebecca L. Larson, Haojing Yan, Mehmet Alpaslan, Rachana Bhatawdekar, Christopher J. Conselice, Alex Griffiths, Louis-Gregory Strolger, J. Stuart B. Wyithe
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
M. A. Marshall, M. Mechtley, R. A. Windhorst, S. H. Cohen, R. A. Jansen, L. Jiang, V. R. Jones, J. S. B. Wyithe, X. Fan, N. P. Hathi, K. Jahnke, W. C. Keel, A. M. Koekemoer, V Marian, K. Ren, J. Robinson, H. J. A. Rottgering, R. E. Ryan, E. Scannapieco, D. P. Schneider, G. Schneider, B. M. Smith, H. Yan
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
Cathryn M. Trott, Catherine A. Watkinson, Christopher H. Jordan, Shintaro Yoshiura, Suman Majumdar, N. Barry, R. Byrne, B. J. Hazelton, K. Hasegawa, R. Joseph, T. Kaneuji, K. Kubota, W. Li, J. Line, C. Lynch, B. McKinley, D. A. Mitchell, M. F. Morales, S. Murray, B. Pindor, J. C. Pober, M. Rahimi, J. Riding, K. Takahashi, S. J. Tingay, R. B. Wayth, R. L. Webster, M. Wilensky, J. S. B. Wyithe, Q. Zheng, David Emrich, A. P. Beardsley, T. Booler, B. Crosse, T. M. O. Franzen, L. Horsley, M. Johnston-Hollitt, D. L. Kaplan, D. Kenney, D. Pallot, G. Sleap, K. Steele, M. Walker, A. Williams, C. Wu
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2019)
