Article
Astronomy & Astrophysics
Khee-Gan Lee, Ilya S. Khrykin, Sunil Simha, Metin Ata, Yuxin Huang, J. Xavier Prochaska, Nicolas Tejos, Jeff Cooke, Kentaro Nagamine, Jielai Zhang
Summary: This paper presents the observations of FRB 20190520B and discovers two large galaxy clusters intersected by the FRB sight line, explaining the anomalous high dispersion measure observed. This result highlights the significance of incorporating foreground data for understanding the nature of FRBs and utilizing them as a cosmological probe.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Computer Science, Artificial Intelligence
Ming-Ming Cheng, Deng-Ping Fan
Summary: The evaluation of foreground maps is crucial for object segmentation algorithms, especially in salient object detection. The S-measure proposed in this study demonstrates superiority over existing measures by simultaneously evaluating region-aware and object-aware structural similarity. Behavioral studies suggest that subjects prefer saliency maps chosen by the S-measure over those chosen by state-of-the-art measures.
INTERNATIONAL JOURNAL OF COMPUTER VISION
(2021)
Article
Astronomy & Astrophysics
Ketan R. Sand, Daniela Breitman, Daniele Michilli, Victoria M. Kaspi, Pragya Chawla, Emmanuel Fonseca, Ryan Mckinven, Kenzie Nimmo, Ziggy Pleunis, Kaitlyn Shin, Bridget C. Andersen, Mohit Bhardwaj, P. J. Boyle, Charanjot Brar, Tomas Cassanelli, Amanda M. Cook, Alice P. Curtin, Fengqiu Adam Dong, Gwendolyn M. Eadie, B. M. Gaensler, Jane Kaczmarek, Adam Lanman, Calvin Leung, Kiyoshi W. Masui, Mubdi Rahman, Ayush Pandhi, Aaron B. Pearlman, Emily Petroff, Masoud Rafiei-Ravandi, Paul Scholz, Vishwangi Shah, Kendrick Smith, Ingrid Stairs, David C. Stenning
Summary: This study presents the morphological properties of the repeating fast radio burst (FRB) FRB 20180916B, which exhibits a periodicity of 16.3 days. The variation in dispersion measure (DM) is found to be small, and there is no discernible trend in scattering time estimates with activity phase. The study also shows that FRB 20180916B has not displayed heightened activity periods and its burst count follows a Poissonian process. The results do not support the idea of a massive binary companion star as the origin of the 16.3 day periodicity.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
G. H. Hilmarsson, D. Michilli, L. G. Spitler, R. S. Wharton, P. Demorest, G. Desvignes, K. Gourdji, S. Hackstein, J. W. T. Hessels, K. Nimmo, A. D. Seymour, M. Kramer, R. Mckinven
Summary: Monitoring of the RM variations of FRB 121102 shows a decreasing trend, although not linear. Additionally, significant short-term RM fluctuations were observed, potentially explained by the presence of a neutron star in a supernova remnant or near a massive black hole.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
Article
Astronomy & Astrophysics
Bridget Andersen, Kevin Bandura, Mohit Bhardwaj, P. J. Boyle, Charanjot Brar, Tomas Cassanelli, S. Chatterjee, Pragya M. Chawla, Amanda P. Cook, Alice Curtin, Matt Dobbs, Fengqiu Adam T. Dong, Jakob Faber, Mateus Fandino, Emmanuel Fonseca, B. M. Gaensler, Utkarsh Giri, Antonio S. Herrera-Martin, Alex Hill, Adaeze Ibik, Alexander F. Josephy, Jane Kaczmarek, Zarif Kader, Victoria Kaspi, T. L. E. Landecker, Adam Lanman, Mattias Lazda, Calvin Leung, Hsiu-Hsien W. Lin, Kiyoshi Masui, Ryan Mckinven, Juan W. Mena-Parra, Bradley Meyers, D. Michilli, Cherry Ng, Ayush B. Pandhi, Aaron Pearlman, Ue-Li Pen, Emily Petroff, Ziggy Pleunis, Masoud Rafiei-Ravandi, Mubdi M. Rahman, Scott Ransom, Andre R. Renard, Ketan Sand, Pranav Sanghavi, Paul Scholz, Vishwangi Shah, Kaitlyn Shin, Seth Siegel, Kendrick Smith, Ingrid Stairs, Jianing P. Su, Shriharsh Tendulkar, Keith Vanderlinde, Haochen Wang, Dallas Wulf, Andrew Zwaniga
Summary: We have discovered 25 new repeating fast radio burst (FRB) sources using a clustering algorithm that identifies colocated events with similar dispersion measures (DMs). The repeaters have DMs ranging from approximately 220 to 1700 pc cm(-3), with as few as two bursts and as many as twelve. We observe a significant difference in DM and extragalactic DM distributions between repeating and nonrepeating sources, with repeaters showing lower mean values. The repeater fraction tends to stabilize at 2.6% over our total time-on-sky.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Kaitlyn Shin, Kiyoshi W. W. Masui, Mohit Bhardwaj, Tomas Cassanelli, Pragya Chawla, Matt Dobbs, Fengqiu Adam Dong, Emmanuel Fonseca, B. M. Gaensler, Antonio Herrera-Martin, Jane Kaczmarek, Victoria Kaspi, Calvin Leung, Marcus Merryfield, Daniele Michilli, Moritz Munchmeyer, Aaron B. B. Pearlman, Masoud Rafiei-Ravandi, Kendrick Smith, Ingrid Stairs, Shriharsh P. P. Tendulkar
Summary: Fast radio bursts (FRBs) are brief, energetic, typically extragalactic flashes of radio emission whose progenitors are largely unknown. We used a catalog of 536 FRBs from the CHIME/FRB collaboration to study the FRB population and calibrate for selection effects. Our results provide insights into the energy distribution, density, and redshift distribution of FRBs, and can help constrain models for FRB progenitors. The upcoming CHIME/FRB Outriggers project will further validate our findings by providing localizations and redshifts of FRBs.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Alice P. Curtin, Shriharsh P. Tendulkar, Alexander Josephy, Pragya Chawla, Bridget Andersen, Victoria M. Kaspi, Mohit Bhardwaj, Tomas Cassanelli, Amanda Cook, Fengqiu Adam Dong, Emmanuel Fonseca, B. M. Gaensler, Jane F. Kaczmarek, Adam E. Lanmnan, Calvin Leung, Aaron B. Pearlman, Emily Petroff, Ziggy Pleunis, Masoud Rafiei-Ravandi, Scott M. Ransom, Kaitlyn Shin, Paul Scholz, Kendrick Smith, Ingrid Stairs
Summary: Fast radio bursts (FRBs) are high-energy radio transients lasting milliseconds, whose origins are uncertain. This study used CHIME/FRB to search for coincident FRB-like radio emissions with 81 GRBs observed between July 2018 and July 2019. No significant overlap was found within 3 sigma of spatial localization or within a week of time difference. The study also placed limits on FRB-like radio emissions before, during, and after high-energy bursts for SGRBs and LGRBs.
ASTROPHYSICAL JOURNAL
(2023)
Article
Limnology
James T. Price, Rowan H. McLachlan, Christopher P. Jury, Robert J. Toonen, Andrea G. Grottoli
Summary: By using stable isotopes, researchers assessed the proportionate contribution of different nutrient sources to Hawaiian corals, finding variations in heterotrophic contributions among species and sites. Bayesian mixing models and isotopic niche overlap provided differing estimates, with implications that the usefulness of each approach may vary depending on factors such as coral health and region. These findings suggest a diverse range of trophic strategies in Hawaiian corals, with heterotrophic feeding not always leading to incorporation into tissues.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Astronomy & Astrophysics
Daniele Michilli, Mohit Bhardwaj, Charanjot Brar, B. M. Gaensler, Victoria M. Kaspi, Aida Kirichenko, Kiyoshi W. Masui, Ryan Mckinven, Cherry Ng, Chitrang Patel, Ketan R. Sand, Paul Scholz, Kaitlyn Shin, Seth R. Siegel, Ingrid Stairs, Tomas Cassanelli, Amanda M. Cook, Matt Dobbs, Fengqiu Adam Dong, Emmanuel Fonseca, Adaeze Ibik, Jane Kaczmarek, Calvin Leung, Aaron B. Pearlman, Emily Petroff, Ziggy Pleunis, Masoud Rafiei-Ravandi, Pranav Sanghavi, J. Richard Shaw, Shriharsh P. Tendulkar
Summary: We present improved sky localizations of 13 repeating fast radio bursts (FRBs) discovered by CHIME/FRB using interferometric techniques on channelized voltages from the telescope. These baseband localizations significantly reduce the localization uncertainty area reported in previous studies. The improved localizations provide valuable information for further follow-up studies of these FRBs. By analyzing the localization uncertainties and dispersion measures, we are able to identify likely host galaxies for two of the FRBs.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Yasuo Doi, Tetsuo Hasegawa, Pierre Bastien, Mehrnoosh Tahani, Doris Arzoumanian, Simon Coude, Masafumi Matsumura, Sarah Sadavoy, Charles L. H. Hull, Yoshito Shimajiri, Ray S. Furuya, Doug Johnstone, Rene Plume, Shu-ichiro Inutsuka, Jungmi Kwon, Motohide Tamura
Summary: Optical stellar polarimetry in the Perseus molecular cloud direction reveals a mixed bimodal distribution of position angles across the cloud, which can be traced to two different dust clouds along the line of sight. Gaia trigonometric distances to the stars show that one component primarily traces the Perseus molecular cloud at a distance of 300 pc, while the other component traces a foreground cloud at a distance of 150 pc, identified as the outer edge of the Taurus molecular cloud. Between the two molecular clouds, a lower-density ellipsoidal dust cavity is identified, located at specific coordinates and associated with the Per OB2 association.
ASTROPHYSICAL JOURNAL
(2021)
Article
Multidisciplinary Sciences
Daniel B. Reeves, Charline Bacchus-Souffan, Mark Fitch, Mohamed Abdel-Mohsen, Rebecca Hoh, Haelee Ahn, Mars Stone, Frederick Hecht, Jeffrey Martin, Steven G. Deeks, Marc K. Hellerstein, Joseph M. McCune, Joshua T. Schiffer, Peter W. Hunt
Summary: The persistence of HIV in people on suppressive antiretroviral therapy is linked to physiological mechanisms of CD4+ T cells. This study investigates the longitudinal kinetics of HIV DNA and cell turnover rates in different CD4 cell subsets. The results indicate that HIV clears faster in more proliferative/differentiated CD4 cell subsets and therapies targeting proliferation and differentiation may reduce HIV DNA levels.
NATURE COMMUNICATIONS
(2023)
Article
Astronomy & Astrophysics
Stefan Heimersheim, Nina S. Sartorio, Anastasia Fialkov, Duncan R. Lorimer
Summary: In this study, we apply a model-independent approach to measure reionization using Fast Radio Burst (FRB) data, which can provide more accurate constraints on cosmological parameters such as the CMB optical depth and the shape of reionization.
ASTROPHYSICAL JOURNAL
(2022)
Article
Mathematics, Applied
Wei Dong, Shuqing Zhang, Xiaowen Zhang, Wanlu Jiang, Liguo Zhang
Summary: In this study, a novel method, called Reverse Transition Entropy (RTE), is proposed to characterize and identify different complex time series. This method combines RTE with refined composite multi-scale analysis and generalized fractional-order entropy to construct the refined composite multi-scale reverse transition generalized fractional-order complexity-entropy curve (RCMS-RT-GFOCEC). Experimental results demonstrate that the RCMS-RT-GFOCEC method can effectively characterize and identify various complex temporal systems with high accuracy.
Article
Plant Sciences
Shuangwei Li, Wopke van Der Werf, Junqi Zhu, Yan Guo, Baoguo Li, Yuntao Ma, Jochem B. Evers
Summary: The study found that intercropped maize performed better in light capture, while intercropped soybean performed worse. Compared to sole crops, intercrop configuration increased maize's light capture rate and reduced soybean's light capture rate.
JOURNAL OF EXPERIMENTAL BOTANY
(2021)
Article
Computer Science, Artificial Intelligence
Antonio Francisco Roldan Lopez de Hierro, Humberto Bustince, Maria del Mar Rueda, Concepcion Roldan, Laura De Miguel, Carlos Guerra
Summary: In this paper, a fuzzy dispersion measure associated with a finite set of data given by fuzzy numbers is introduced based on the analysis of the most widely used dispersion measure in the real context. This measure is implemented as a fuzzy number, so no information loss is caused by defuzzification. The proposed concept satisfies the usual properties in a genuinely fuzzy sense and removes limitations in terms of geometric shape or analytical properties, allowing negative values in its support. The new notion is a way of fusing information in a fuzzy dataset to make decisions based on dispersion.
INFORMATION FUSION
(2023)
Article
Astronomy & Astrophysics
M. T. Miles, R. M. Shannon, M. Bailes, D. J. Reardon, M. J. Keith, A. D. Cameron, A. Parthasarathy, M. Shamohammadi, R. Spiewak, W. van Straten, S. Buchner, F. Camilo, M. Geyer, A. Karastergiou, M. Kramer, M. Serylak, G. Theureau, V. Venkatraman Krishnan
Summary: We present the first 2.5 yr of data from the MeerKAT Pulsar Timing Array (MPTA), aiming to measure pulse arrival times from 88 pulsars with the goal of contributing to the study of gravitational waves. The data release includes arrival times, noise models, and timing archives for 78 pulsars with high precision. The study also introduces a novel method for clock correction waveform recovery solely from pulsar timing residuals.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
L. S. Oswald, S. Johnston, A. Karastergiou, S. Dai, M. Kerr, M. E. Lower, R. N. Manchester, R. M. Shannon, C. Sobey, P. Weltevrede
Summary: This study examines the broadband polarization of 271 young radio pulsars, with a focus on circular polarization. Through defining categories for frequency- and phase-dependent polarization evolution, the researchers investigate the relationship between deviations of linear polarization position angle, circular polarization features, and frequency evolution of polarization. The study also demonstrates the evolution of polarization fraction, circular polarization contribution, and profile complexity with spin-down energy (E?).
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ken Mawatari, Akio K. K. Inoue, Toru Yamada, Tomoki Hayashino, J. Xavier Prochaska, Khee-Gan Lee, Nicolas Tejos, Nobunari Kashikawa, Takuya Otsuka, Satoshi Yamanaka, David J. J. Schlegel, Yuichi Matsuda, Joseph F. F. Hennawi, Ikuru Iwata, Hideki Umehata, Shiro Mukae, Masami Ouchi, Yuma Sugahara, Yoichi Tamura
Summary: We conducted a deep spectroscopic survey using the DEIMOS instrument on the Keck telescope to map high-z H i gas in the SSA22 field through Ly alpha absorption analysis. We confirmed the spectra of 198 galaxies in the 26 x 15 arcmin(2) area, with a redshift range of 2.5 < z < 6, including 148 newly determined galaxies. Our compiled catalog of 730 galaxies at z > 2 in the SSA22 field is comparable to other major extragalactic survey fields. Our data set allows us to create a tomographic map of H i gas at z greater than or similar to 3.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Yuan Qi Ni, Dae-Sik Moon, Maria R. Drout, Abigail Polin, David J. Sand, Santiago Gonzalez-Gaitan, Sang Chul Kim, Youngdae Lee, Hong Soo Park, D. Andrew Howell, Peter E. Nugent, Anthony L. Piro, Peter J. Brown, Lluis Galbany, Jamison Burke, Daichi Hiramatsu, Griffin Hosseinzadeh, Stefano Valenti, Niloufar Afsariardchi, Jennifer E. Andrews, John Antoniadis, Rachael L. Beaton, K. Azalee Bostroem, Raymond G. Carlberg, S. Bradley Cenko, Sang-Mok Cha, Yize Dong, Avishay Gal-Yam, Joshua Haislip, Thomas W. -S. Holoien, Sean D. Johnson, Vladimir Kouprianov, Yongseok Lee, Christopher D. Matzner, Nidia Morrell, Curtis McCully, Giuliano Pignata, Daniel E. Reichart, Jeffrey Rich, Stuart D. Ryder, Nathan Smith, Samuel Wyatt, Sheng Yang
Summary: SN 2018aoz is a Type Ia SN with unique light curves, and the nature and origin of the SN are constrained by the distribution of iron-peak elements and spectroscopic features. The possible origin and explosion mechanisms are related to the interaction between the binary companion and circumstellar material.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Chenze Dong, Khee-Gan Lee, Metin Ata, Benjamin Horowitz, Rieko Momose
Summary: We report the discovery of a galaxy protocluster (COSTCO-I) at z=2.30 in the COSMOS field, where the Ly alpha forest does not exhibit significant absorption, contrary to the expected fluctuating Gunn-Peterson approximation (FGPA). By comparing with mock Ly alpha forest maps, we find that the observed Ly alpha forest in COSTCO-I is consistently more transparent, suggesting that the gas in this protocluster is being heated above the expectations of the FGPA. This has implications for the growth of the intracluster medium (ICM) and AGN feedback mechanisms.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Rowina S. Nathan, Matthew T. Miles, Gregory Ashton, Paul D. Lasky, Eric Thrane, Daniel J. Reardon, Ryan M. Shannon, Andrew D. Cameron
Summary: Precision pulsar timing is crucial for detecting nanohertz stochastic gravitational-wave background and understanding neutron star physics. The conventional method of fixed-time and frequency-averaged templates can lead to reduced accuracy due to the evolution of pulse shape over time. We propose a dynamic timing method that fits each observing epoch separately using basis functions, allowing for pulse shape evolution. Applying this method to PSR J1103-5403, we find evidence of mode changing and improve the timing solution by 1.78 times compared to template fitting. The reduction in white noise boosts the signal-to-noise ratio of gravitational-wave background signal by 32 percent for this pulsar.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Anjasha Gangopadhyay, Keiichi Maeda, Avinash Singh, A. J. Nayana, Tatsuya Nakaoka, Koji S. Kawabata, Kenta Taguchi, Mridweeka Singh, Poonam Chandra, Stuart D. Ryder, Raya Dastidar, Masayuki Yamanaka, Miho Kawabata, Rami Z. E. Alsaberi, Naveen Dukiya, Rishabh Singh Teja, Bhavya Ailawadhi, Anirban Dutta, D. K. Sahu, Takashi J. Moriya, Kuntal Misra, Masaomi Tanaka, Roger Chevalier, Nozomu Tominaga, Kohki Uno, Ryo Imazawa, Taisei Hamada, Tomoya Hori, Keisuke Isogai
Summary: This article presents the optical, near-infrared, and radio observations of the supernova SN IIb 2022crv. The observations reveal that it underwent a transition from an SN IIb to an SN Ib and retained a thin H envelope. The light curve evolution and spectral modeling provide insights into the nature of this supernova.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Griffin Hosseinzadeh, David J. Sand, Sumit K. Sarbadhicary, Stuart D. Ryder, Saurabh W. Jha, Yize Dong, K. Azalee Bostroem, Jennifer E. Andrews, Emily Hoang, Daryl Janzen, Jacob E. Jencson, Michael Lundquist, Nicolas E. Meza Retamal, Jeniveve Pearson, Manisha Shrestha, Stefano Valenti, Samuel Wyatt, Joseph Farah, D. Andrew Howell, Curtis McCully, Megan Newsome, Estefania Padilla Gonzalez, Craig Pellegrino, Giacomo Terreran, Muzoun Alzaabi, Elizabeth M. Green, Jessica L. Gurney, Peter A. Milne, Kaycee I. Ridenhour, Nathan Smith, Paulina Soto Robles, Lindsey A. Kwok, Michaela Schwab, Mariusz Gromadzki, David A. H. Buckley, Koichi Itagaki, Daichi Hiramatsu, Laura Chomiuk, Peter Lundqvist, Joshua Haislip, Vladimir Kouprianov, Daniel E. Reichart
Summary: We present early observations of supernova 2023bee, which show excess in the optical and UV bands during the first few days after the explosion. These observations provide insights into the nature of the binary companion and the conditions leading to ignition. The Kasen model of a main-sequence companion star causing shock on the ejecta matches our data well, while other models like double detonations and interaction with circumstellar material do not. Our radio nondetections suggest that the companion is likely a main-sequence star.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
P. Kumar, R. Luo, D. C. Price, R. M. Shannon, A. T. Deller, S. Bhandari, Y. Feng, C. Flynn, J. C. Jiang, P. A. Uttarkar, S. Q. Wang, S. B. Zhang
Summary: As the sample size of repeating fast radio bursts (FRBs) has increased, we have gained a better understanding of the diversity of these phenomena. Through long-term monitoring, we have found that different sources of repeating FRBs have both common and unique characteristics. In this study, we observed the repeating FRB source 20180301A using the ultra-wideband low (UWL) receiver and detected 46 bursts. We found that none of the repeat bursts displayed radio emission in the range of 1.8-4 GHz, while the burst emission peak occurred at 1.1 GHz. We also discovered evidence for trends in burst dispersion measure and significant variation in Faraday rotation measure, as well as polarization properties consistent with other repeating FRB sources.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
P. Gitika, M. Bailes, R. M. Shannon, D. J. Reardon, A. D. Cameron, M. Shamohammadi, M. T. Miles, C. M. L. Flynn, A. Corongiu, M. Kramer
Summary: This study presents a flux density analysis of 89 millisecond pulsars (MSPs) monitored as part of the MeerKAT Pulsar Timing Array (MPTA). The analysis reveals that most MSPs have spectra that can be described by a simple power law, and their intrinsic radio luminosities are stable. Observations of refractive scintillation lead to recommendations for improved efficiency in timing arrays and prioritization of highly scintillating regions for 20 cm Fast Radio Burst (FRB) surveys.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. E. Lower, S. Johnston, A. Karastergiou, P. R. Brook, M. Bailes, S. Buchner, A. T. Deller, L. Dunn, C. Flynn, M. Kerr, R. N. Manchester, A. Mandlik, L. S. Oswald, A. Parthasarathy, R. M. Shannon, C. Sobey, P. Weltevrede
Summary: We conducted a comprehensive study on PSR J0738-4042, analyzing rotational and emission properties using observations from various observatories over a span of 50 years. We developed continuous models using Gaussian process regression to track spin-down rate and pulse profile evolution, finding similarities in profile variations across different observing frequencies and polarizations. No new spin-down or profile events were observed, but the disappearance of a bright emission component was noted without a substantial change in spin-down rate. Possible explanations include interactions with asteroids or magnetospheric state-switching.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Pravir Kumar, Ryan M. Shannon, Marcus E. Lower, Adam T. Deller, J. Xavier Prochaska
Summary: The study of impulsive astrophysical radio emission allows us to investigate the plasma between the emission source and the Earth. The circular propagating wave modes in cold electron-ion plasmas affect the linear polarization plane, while in relativistic plasmas, the wave modes can convert linearly polarized emission into circular and vice versa. Fast radio bursts (FRBs) provide an opportunity to study the intergalactic and magneto-ionic medium. This article presents the polarimetric analysis of a repeat burst from the FRB 20201124A source, which displays a unique frequency-dependent circular polarization. The observed circular polarization can be explained by the propagation of a linearly polarized burst signal through a relativistic plasma along the line of sight from the progenitor.
Article
Astronomy & Astrophysics
Karen Lee-Waddell, Clancy W. James, Stuart D. Ryder, Elizabeth K. Mahony, Arash Bahramian, Barbel S. Koribalski, Pravir Kumar, Lachlan Marnoch, Freya O. North-Hickey, Elaine M. Sadler, Ryan Shannon, Nicolas Tejos, Jessica E. Thorne, Jing Wang, Randall Wayth
Summary: The potential host galaxy of FRB 20171020A was identified as ESO 601-G036 in 2018, but confirmation is still lacking. Recent developments have led to a re-examination, resulting in a new association confidence level of 98%. The ESO 601-G036 system shows signs of ongoing minor merger events, and detailed multi-wavelength analysis reveals it to be a typical star-forming galaxy.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2023)
Article
Astronomy & Astrophysics
N. D. R. Bhat, N. A. Swainston, S. J. McSweeney, M. Xue, B. W. Meyers, S. Kudale, S. Dai, S. E. Tremblay, W. van Straten, R. M. Shannon, K. R. Smith, M. Sokolowski, S. M. Ord, G. Sleap, A. Williams, P. J. Hancock, R. Lange, J. Tocknell, M. Johnston-Hollitt, D. L. Kaplan, S. J. Tingay, M. Walker
Summary: In Paper I, an overview of the Southern-sky MWARapid Two-metre (SMART) survey, including its design and search pipeline, was presented. The survey has progressed to 75% of the planned sky coverage through the utilization of the compact configuration of the Phase II array during multiple windows of opportunity. The ongoing analysis has resulted in new pulsar discoveries, as well as the re-detection of previously incorrectly characterized pulsars.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2023)
