Article
Astronomy & Astrophysics
M. Cruces, D. J. Champion, D. Li, M. Kramer, W. W. Zhu, P. Wang, A. D. Cameron, Y. T. Chen, G. Hobbs, P. C. C. Freire, E. Graikou, M. Krco, Z. J. Liu, C. C. Miao, J. Niu, Z. C. Pan, L. Qian, M. Y. Xue, X. Y. Xie, S. P. You, X. H. Yu, M. Yuan, Y. L. Yue, Y. Zhu
Summary: We report the follow-up of 10 pulsars discovered by FAST during its commissioning, showing interesting features like a young, energetic pulsar and a wide WD binary system. Discrepancies were found between estimations based on different electron density models.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Yuanming Wang, Tara Murphy, Emil Lenc, Louis Mercorelli, Laura Driessen, Joshua Pritchard, Baoqiang Lao, David L. Kaplan, Tao An, Keith W. Bannister, George Heald, Shuoying Lu, Artem Tuntsov, Mark Walker, Andrew Zic
Summary: We conducted a radio survey for variable and transient sources on 15-min time-scales using the Australian SKA Pathfinder (ASKAP) pilot surveys. A total of 38 variable and transient sources were detected, including known pulsars, stars, and active galactic nuclei or galaxies. This is the first large-scale radio survey for variables and transient sources on minute time-scales at a sub-mJy sensitivity level.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
B. Posselt, A. Karastergiou, S. Johnston, A. Parthasarathy, M. J. Keith, L. S. Oswald, X. Song, P. Weltevrede, E. D. Barr, S. Buchner, M. Geyer, M. Kramer, D. J. Reardon, M. Serylak, R. M. Shannon, R. Spiewak, V. Venkatraman Krishnan
Summary: In this study, pulse width measurements of a sample of radio pulsars observed with the MeerKAT telescope were presented. The relationship between width and rotation period was investigated, revealing interesting findings regarding the width changes over frequency. The study also included population-based estimates of the obliquity of the magnetic axis and attempted to explain the width changes using a qualitative model of Gaussian pulse components.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Che-Yen Chu, C-Y Ng, Albert K. H. Kong, Hsiang-Kuang Chang
Summary: By investigating the radio spectra of two magnetars, it was found that the radio flux density significantly increased during the X-ray outburst, and different spectral features were observed at different frequency ranges. This suggests potential differences in the emission mechanism between the cm and the submm bands.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
F. F. Kou, W. M. Yan, B. Peng, J. G. Lu, K. Liu, C. M. Zhang, R. G. Strom, L. Wang, J. P. Yuan, Rai Yuen, Y. Z. Yu, J. M. Yao, B. Liu, J. Yan, P. Jiang, C. J. Jin, D. Li, L. Qian, Y. L. Yue, Y. Zhu
Summary: The study analyzed single pulses from PSR B1929+10 using FAST and found that both main pulse and interpulse exhibit periodic modulation, challenging current pulsar models. The specific modulation patterns observed suggest a phase-locked relationship between the main pulse and interpulse, with delayed modulation in certain components, providing new insights into pulsar emission structure and neutron star magnetosphere.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
M. Caleb, L. N. Driessen, A. C. Gordon, N. Tejos, L. Bernales, H. Qiu, J. O. Chibueze, B. W. Stappers, K. M. Rajwade, F. Cavallaro, Y. Wang, P. Kumar, W. A. Majid, R. S. Wharton, C. J. Naudet, M. C. Bezuidenhout, F. Jankowski, M. Malenta, V Morello, S. Sanidas, M. P. Surnis, E. D. Barr, W. Chen, M. Kramer, W. Fong, C. D. Kilpatrick, J. Xavier Prochaska, S. Simha, C. Venter, I Heywood, A. Kundu, F. Schussler
Summary: We discovered FRB 20210410D using the MeerKAT radio interferometer in South Africa within the MeerTRAP commensal project. The FRB has a dispersion measure of DM = 578.78 +/- 2 pc cm(-3) and was localized accurately in the 2 s images. It was found to be associated with an optical galaxy at z = 0.1415, indicating a significant DM contribution from the host galaxy.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Wenbin Lu, Paz Beniamini, Pawan Kumar
Summary: A repeated source of fast radio bursts has been discovered in a globular cluster in M81. The study suggests that strongly magnetized neutron stars responsible for FRBs may not only be born during the core-collapse of young massive stars, but also through mergers of old white dwarfs. The activity time of the M81-FRB source is estimated to be around 10^5 years, and older stellar populations contribute at least a few percent to the total FRB rate.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Yun-Wei Yu, Yuan-Chuan Zou, Zi-Gao Dai, Wen-Fei Yu
Summary: The study suggests that the XRB emission is produced in the magnetosphere and the FRB emission may be generated by shock-powered synchrotronmaser. Observational constraints indicate that the model can in principle be consistent with FRB observations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Zhengli Wang, Jiguang Lu, Jinchen Jiang, Jie Lin, Kejia Lee, Enwei Liang, Renxin Xu
Summary: This study analyzes the radiation characteristics of the nearby pulsar PSR B0950 + 08 using data observed by the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The results show that the radiation of PSR B0950 + 08 can be detected over the entire pulse period, and suggest that the weak emission known as the "bridge emission" may come from the upper magnetosphere. The findings have implications for understanding the magnetospheric geometry of this pulsar.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
O. M. Boersma, J. van Leeuwen, E. A. K. Adams, B. Adebahr, A. Kutkin, T. Oosterloo, W. J. G. de Blok, R. van den Brink, A. H. W. M. Coolen, L. Connor, S. Damstra, H. Denes, K. M. Hess, J. M. van der Hulst, B. Hut, M. Ivashina, G. M. Loose, D. M. Lucero, Y. Maan, A. Mika, V. A. Moss, H. Mulder, L. C. Oostrum, M. Ruiter, D. van der Schuur, R. Smits, N. J. Vermaas, D. Vohl, J. Ziemke
Summary: A search for a radio counterpart to the gravitational-wave source GW190425, a binary neutron star merger, identified 25 afterglow candidates and 55 transient afterglow candidates. However, none of these could be associated with a possible host galaxy at the luminosity distance of GW190425. The study validates methods for future searches of radio afterglows.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Chen-Ming Chang, Jun-Jie Wei, Song-Bo Zhang, Xue-Feng Wu
Summary: By analyzing the arrival time differences of photons with different frequencies from the same astrophysical source, tight limits on the photon mass have been set. However, these constraints have relied on the first-order Taylor expansion. In this study, the dispersion of the nonzero photon mass is analyzed using the second-order derivative of Taylor series. The dedispersed pulses from the Crab pulsar and the fast radio burst FRB 180916B provide strict limits on the photon mass, indicating the possibility of a second-order photon mass effect for the first time.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Abdujappar Rusul, Xiao-Ping Zheng, Ali Esamdin, Liang Guo, Li-Xin Xia
Summary: The study reveals that the polar-cap parameters of intermittent pulsars almost reach their maximum values, consistent with the main prediction of the pulsar polar-cap theory regarding the breaking of radio emission. Additionally, intermittent pulsars are distributed near the dipole death line in the P-(P)over dot diagram, in line with their emission features and calculated polar-cap parameters.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Xia Zhou, Ang Li, Bao-An Li
Summary: The secondary component of GW190814 is believed to possibly be a supermassive and superfast pulsar, with its r-mode stability depending on its rotational frequency and temperature.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
G. Voisin
Summary: This study investigates the constraints applied by geometry on the morphology and polarization of fast radio bursts (FRBs), assuming they are produced by ultra-relativistic matter in a localized region of smooth streamlines. By expressing the problem in terms of the local properties of direction and curvature, the results can be applied to any desired geometry. The study illustrates two geometries inspired by pulsar and magnetar magnetospheres, and proposes a relationship between burst morphologies and the properties of the source based on geometrical considerations.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Stella Koch Ocker, James M. Cordes, Shami Chatterjee, Di Li, Chen-Hui Niu, James W. McKee, Casey J. Law, Reshma Anna-Thomas
Summary: Fast radio bursts (FRBs) are millisecond-time-scale radio transients originated from highly magnetized compact objects primarily detected in extragalactic sources and undergo scattering due to plasma density fluctuations. We report the observation of variable scattering times in the repeating FRB 20190520B, which can deviate from the typical power law. These scattering variations are likely caused by inhomogeneous plasma in the circumsource medium and can provide insights into small-scale processes within FRB environments.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Chen Deng, Yong-Feng Huang, Fan Xu
Summary: The X-ray afterglow of many gamma-ray bursts (GRBs) exhibits a plateau phase before the normal power-law decay stage, which may be related to continued activities of the central engine. Tang et al. collected 174 such GRBs and confirmed the L-T-E correlation involving three key parameters. The correlation is updated and then applied to derive the pseudo-redshift of other 130 plateau GRBs.
ASTROPHYSICAL JOURNAL
(2023)
Article
Physics, Multidisciplinary
Bo-Jun Wang, Heng Xu, Jin-Chen Jiang, Jiang-Wei Xu, Jia-Rui Niu, Ping Chen, Ke-Jia Lee, Bing Zhang, Wei-Wei Zhu, Su-Bo Dong, Chun-Feng Zhang, Hai Fu, De-Jiang Zhou, Yong-Kun Zhang, Pei Wang, Yi Feng, Ye Li, Dong-Zi Li, Wen-Bin Lu, Yuan-Pei Yang, R. N. Caballero, Ce Cai, Mao-Zheng Chen, Zi-Gao Dai, A. Esamdin, Heng-Qian Gan, Jin-Lin Han, Long-Fei Hao, Yu-Xiang Huang, Peng Jiang, Cheng-Kui Li, Di Li, Hui Li, Xin-Qiao Li, Zhi-Xuan Li, Zhi-Yong Liu, Rui Luo, Yun-Peng Men, Chen-Hui Niu, Wen-Xi Peng, Lei Qian, Li-Ming Song, Jing-Hai Sun, Fa-Yin Wang, Min Wang, Na Wang, Wei-Yang Wang, Xue-Feng Wu, Shuo Xiao, Shao-Lin Xiong, Yong-Hua Xu, Ren-Xin Xu, Jun Yang, Xuan Yang, Rui Yao, Qi-Bin Yi, You-Ling Yue, Dong-Jun Yu, Wen-Fei Yu, Jian-Ping Yuan, Bin-Bin Zhang, Song-Bo Zhang, Shuang-Nan Zhang, Yi Zhao, Wei-Kang Zheng, Yan Zhu, Jin-Hang Zou
Summary: In this paper, a collection of 1863 burst dynamic spectra of FRB 20201124A measured with the FAST telescope is presented. This dataset represents the largest sample of pulses detected for any FRB so far.
Article
Astronomy & Astrophysics
Fan Xu, Yong-Feng Huang, Jin-Jun Geng, Xue-Feng Wu, Xiu-Juan Li, Zhi-Bin Zhang
Summary: Empirical correlations between key parameters of gamma-ray bursts (GRBs), such as the Amati relation and Yonetoku relation, have been extensively explored. Most GRBs follow these correlations well, but a theoretical interpretation is lacking. This study provides simple analytical derivations for the Amati and Yonetoku relations, and confirms their correctness through numerical simulations. The results reveal the intrinsic physics behind GRBs' radiation processes and emphasize the importance of viewing angles in empirical correlations.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Jianwei Zhang, Chengmin Zhang, Di Li, Wuming Yang, Xianghan Cui, ChangQing Ye, Dehua Wang, Yiyan Yang, Shaolan Bi, Xianfei Zhang
Summary: The CHIME/FRB project recently published its first catalog of fast radio bursts (FRBs), which includes 536 unique bursts. Using the latest set of FRBs in this catalog, the study aims to investigate the distribution of dispersion measure (DM) or redshift (z) in the FRB population, which could provide insights into the origin of FRBs. The study adopts the M&E 2018 model and focuses on the Phi(z) function, representing the number of bursts per proper time per comoving volume, and its power-law index (n). The estimated value of n suggests that the FRB population evolves with redshift consistent with or faster than the star formation rate (SFR), supporting the hypothesis of FRBs originating from young magnetars.
Article
Astronomy & Astrophysics
Derek Ward-Thompson, Janik Karoly, Kate Pattle, Anthony Whitworth., Jason Kirk., David. Berry, Pierre Bastien, Tao-Chung Ching, Simon Coude, Jihye Hwang, Woojin Kwon, Archana Soam, Jia-Wei Wang, Tetsuo Hasegawa, Shih-Ping Lai, Keping Qiu, Doris Arzoumanian, Tyler L. Bourke, Do-Young Byun, Huei-Ru Vivien Chen, Wen Ping Chen, Mike Chen, Zhiwei Chen, Jungyeon Cho, Minho Choi, Youngwoo Choi, Yunhee Choi, Antonio Chrysostomou, Eun Jung Chung, Sophia Dai, Victor Debattista, James Di Francesco, Pham Ngoc Diep, Yasuo Doi, Hao-Yuan Duan, Yan Duan, Chakali Eswaraiah, Lapo Fanciullo, Jason Fiege, Laura M. Fissel, Erica Franzmann, Per Friberg, Rachel Friesen, Gary Fuller, Ray Furuya, Tim Gledhill, Sarah Graves, Jane Greaves, Matt Griffin, Qilao Gu, Ilseung Han, Saeko Hayashi, Thiem Hoang, Martin Houde, Charles L. H. Hull, Tsuyoshi Inoue, Shu-ichiro Inutsuka, Kazunari Iwasaki, Il-Gyo Jeong, Doug Johnstone, Vera Koenyves, Ji-hyun Kang, Miju Kang, Akimasa Kataoka, Koji Kawabata, Francisca Kemper, Jongsoo Kim, Shinyoung Kim, Gwanjeong Kim, Kyoung Hee Kim, Mi-Ryang Kim, Kee-Tae Kim, Hyosung Kim, Florian Kirchschlager, Masato I. N. Kobayashi, Patrick M. Koch, Takayoshi Kusune, Jungmi Kwon, Kevin Lacaille, Chi-Yan Law, Chang Won Lee, Hyeseung Lee, Yong-Hee Lee, Chin-Fei Lee, Jeong-Eun Lee, Sang-Sung Lee, Di Li, Di Li, Guangxing Li, Hua-bai Li, Sheng-Jun Lin, Hong-Li Liu, Tie Liu, Sheng-Yuan Liu, Junhao Liu, Steven Longmore, Xing Lu, A-Ran Lyo, Steve Mairs, Masafumi Matsumura, Brenda Matthews, Gerald Moriarty-Schieven, Tetsuya Nagata, Fumitaka Nakamura, Hiroyuki Nakanishi, Nguyen Bich Ngoc, Nagayoshi Ohashi, Takashi Onaka, Geumsook Park, Harriet Parsons, Nicolas Peretto, Felix Priestley, Tae-Soo Pyo, Lei Qian, Ramprasad Rao, Jonathan Rawlings, Mark Rawlings, Brendan Retter, John Richer, Andrew Rigby, Sarah Sadavoy, Hiro Saito, Giorgio Savini, Masumichi Seta, Yoshito Shimajiri, Hiroko Shinnaga, Mehrnoosh Tahani, Motohide Tamura, Ya-Wen Tang, Xindi Tang, Kohji Tomisaka, Le Ngoc Tram, Yusuke Tsukamoto, Serena Viti, Hongchi Wang, Jintai Wu, Jinjin Xie, Meng-Zhe Yang, Hsi-Wei Yen, Hyunju Yoo, Jinghua Yuan, Hyeong-Sik Yun, Tetsuya Zenko, Guoyin Zhang, Yapeng Zhang, Chuan-Peng Zhang, Jianjun Zhou, Lei Zhu, Ilse de Looze, Philippe Andre, C. Darren Dowell, David Eden, Stewart Eyres, Sam Falle, Valentin J. M. Le Gouellec, Frederick Poidevin, Jean-Francois Robitaille, Sven van Loo
Summary: We conducted BISTRO Survey observations of the L1495A-B10 region in the Taurus molecular cloud and found a triangular network of dense filaments. Within these filaments, we identified nine starless cores in polarization, and observed that the core-scale magnetic field orientation is nearly perpendicular to the filaments. Furthermore, we discovered a transitional stage in early prestellar evolution and observed the sheet-like structure and its fragmentation into filaments, providing valuable insights into the transition from field-dominated to matter-dominated evolution.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Yan Duan, Di Li, Paul F. Goldsmith, Laurent Pagani, Tao-Chung Ching, Shu Liu, Jinjin Xie, Chen Wang
Summary: Star formation can create bubbles and outflows that inject momentum and energy into the interstellar medium, affecting the overall energy balance of the molecular cloud. The study reports the identification of a new molecular bubble with an outflow, along with a Herbig-Haro object. Through the analysis of multiwavelength data, the spatial structure, energy injection, and dynamical timescale of the bubble have been investigated. This discovery provides additional observational evidence for the theory of stellar wind from T Tauri stars and enhances our understanding of stellar feedback in molecular clouds.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Ziping Guo, Zhigang Wen, Jianping Yuan, Feifei Kou, Qingdong Wu, Na Wang, Weiwei Zhu, Di Li, Mengyao Xue, Pei Wang, Chenchen Miao, De Zhao, Yue Hu, Wenming Yan, Jiarui Niu, Rukiye Rejep, Zhipeng Huang
Summary: We investigated the single-pulse emission variations of PSRs J0211+4235 and J0553+4111 observed with the Five-hundred-meter Aperture Spherical radio Telescope. The pulse profiles of PSR J0211+4235 showed a weak pulse component following the main one, while PSR J0553+4111 displayed a bimodal profile with a bridge component. PSR J0211+4235 exhibited significant nulling phenomenon, with varying nulling and burst durations. The study also analyzed the modulation characteristics and polarization properties of these pulsars.
RESEARCH IN ASTRONOMY AND ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Yutong Chen, Pei Wang, Di Li, Erbil Guegercinoglu, Rushuang Zhao, Lingqi Meng, Jianping Yuan, Jiarui Niu, Weiwei Zhu, Yi Feng, Chenchen Miao, Chenhui Niu, Qingdong Wu, Na Wang, Shen Wang, Xiaoyao Xie, Mengyao Xue, Jumei Yao, Mao Yuan, Shanping You, Xuhong Yu, Youling Yue, Jie Zhang, Junshuo Zhang, Lei Zhang, Yabiao Wang, Zhenye Gan, Yuxi Li, Zhongyi Sun, Chengjie Wang
Summary: We report the discovery of PSR J1909+0122 by FAST, which is part of the Commensal Radio Astronomy FAST Survey. The pulsar has a spin period of 1.257 s and a dispersion measure of 186.2 pc cm-3. Analysis of the pulse profile reveals two distinct components, and a single-pulse study shows a periodic nulling behavior with a period of 30 rotation periods. Comparison with other pulsars suggests that PSR J1909+0122 has the second largest nulling fraction in the population. Long-term timing observations provide insights into the pulsar's emission mechanism and its temporal evolution.
RESEARCH IN ASTRONOMY AND ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Zong-Hao Chen, Shan-Ping You, Xu-Hong Yu, Pei Wang, Di Li, Xiao-Yao Xie, Zhi-Jie Liu, Chun-Qing Wang, Peng Zeng, Bin Zhang
Summary: RFI interference is a well-recognized issue in radio astronomy research, and we propose an intuitive and powerful RFI mitigation pipeline (CCF-ST) to improve the quality of data in pulsar and fast radio burst searches. The CCF-ST is a spatial filter constructed using the cross-correlation function (CCF) and Sum-Threshold (ST) algorithm. The performance of CCF-ST is evaluated using data from CRAFTS, and it outperforms other methods such as PRESTO's rfifind and ArPLS-ST in terms of reducing data loss rate and improving signal-to-noise ratio.
RESEARCH IN ASTRONOMY AND ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Q. J. Zhi, J. T. Bai, L. H. Shang, X. Xu, S. J. Dang, D. Li, L. Zhang, P. Wang, X. Y. Xie, R. S. Zhao, A. J. Dong, G. J. Qiao
Summary: We observed periodic nulling in PSR B2111+46 at 1250 MHz using the FAST telescope. The nulling fractions and nulling period were calculated to be 17% ± 1% and 62.49 ± 0.99 P (1), respectively, showing variations in periodicity with time. We investigated the durations of consecutive bursts and nulling, finding power-law distributions with indices of -1.11 ± 0.04 and -2.08 ± 0.23. The width of the profile narrowed with increasing frequency, while the degree of polarization showed no obvious trend. Additionally, we discovered a weak emission component in front of the leading component of this pulsar. By fitting the rotation vector model, we determined the angles of the magnetic inclination and the line of sight to be approximately 13.0° and 11.6°, respectively. The sensitive observations with FAST improved our understanding of the pulsar's emission.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Jinjin Xie, Juan Li, Junzhi Wang, Shu Liu, Kai Yang, Donghui Quan, Siqi Zheng, Yuqiang Li, Jingwen Wu, Yan Duan, Di Li
Summary: In this study, the first imaging results of HNCO (4-3) line wings towards nine sources in a sample of 23 massive star-forming regions are presented. The spatial distributions of HNCO (4-3) emission are found to nicely associate with those of HCO+ (1-0) in most sources, indicating that HNCO can trace outflows in massive star-forming regions. The high-intensity ratios and column density ratios of HNCO to HCO+ obtained in the line wings further support this conclusion.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Renzhi Su, Minfeng Gu, S. J. Curran, Elizabeth K. Mahony, Ningyu Tang, James R. Allison, Di Li, Ming Zhu, J. N. H. S. Aditya, Hyein Yoon, Zheng Zheng, Zhongzu Wu
Summary: In this letter, the authors report the discovery of a fast neutral hydrogen outflow in a merging radio galaxy, potentially driven by a radio jet. The study suggests that the AGN radiation may not be powerful enough to provide negative feedback, while the radio jet shows the potential for negative feedback.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Chen-Ran Hu, Yong-Feng Huang
Summary: This study investigates the key parameters and time evolution of a sample of 16 repeating FRBs, exploring potential correlations between them. The study finds that the DM of FRB 20121102A seems to increase continuously, while FRB 20190520B exhibits a larger variation range. The RM shows a more chaotic behavior in different repeaters. A linear correlation between absolute mean RM and DMHost is discovered, which could provide a method to estimate the redshift of FRBs. Additionally, the waiting time of active repeaters shows a similar bimodal distribution.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2023)
Article
Astronomy & Astrophysics
Shu Liu, Junzhi Wang, Fei Li, Jingwen Wu, Zhi-Yu Zhang, Di Li, Ningyu Tang, Pei Zuo
Summary: Spatial variations of optical depths have been detected in Galactic massive star-forming regions. In this study, we mapped 51 Galactic massive star-forming regions using the SMT telescope and obtained reliable measurements of spatially resolved optical depths for 30 regions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
X. F. Dong, Z. B. Zhang, Q. M. Li, Y. F. Huang, K. Bian
Summary: The event rate of long gamma-ray bursts exceeds the star formation rate at low redshifts, especially for low-luminosity bursts. This suggests that there may be new origins for low-luminosity bursts that are not connected to star formation, independent of sample size and completeness.
ASTROPHYSICAL JOURNAL
(2023)
