An X-Ray Burst from a Magnetar Enlightening the Mechanism of Fast Radio Bursts
M. Tavani, C. Casentini, A. Ursi, F. Verrecchia, A. Addis, L. A. Antonelli, A. Argan, G. Barbiellini, L. Baroncelli, G. Bernardi, G. Bianchi, A. Bulgarelli, P. … 展开作者
M. Tavani, C. Casentini, A. Ursi, F. Verrecchia, A. Addis, L. A. Antonelli, A. Argan, G. Barbiellini, L. Baroncelli, G. Bernardi, G. Bianchi, A. Bulgarelli, P. Caraveo, M. Cardillo, P. W. Cattaneo, A. W. Chen, E. Costa, E. Del Monte, G. Di Cocco, G. Di Persio, I. Donnarumma, Y. Evangelista, M. Feroci, A. Ferrari, V. Fioretti, F. Fuschino, M. Galli, F. Gianotti, A. Giuliani, C. Labanti, F. Lazzarotto, P. Lipari, F. Longo, F. Lucarelli, A. Magro, M. Marisaldi, S. Mereghetti, E. Morelli, A. Morselli, G. Naldi, L. Pacciani, N. Parmiggiani, F. Paoletti, A. Pellizzoni, M. Perri, F. Perotti, G. Piano, P. Picozza, M. Pilia, C. Pittori, S. Puccetti, G. Pupillo, M. Rapisarda, A. Rappoldi, A. Rubini, G. Setti, P. Soffitta, M. Trifoglio, A. Trois, S. Vercellone, V. Vittorini, P. Giommi, F. D' Amico
Fast radio bursts (FRBs) are short (millisecond) radio pulses originating from enigmatic sources at extragalactic distances so far lacking a detection in other energy bands. Magnetized neutron stars (magnetars) have been considered as the sources powering the FRBs, but the connection is controversial because of differing energetics and the lack of radio and X-ray detections with similar characteristics in the two classes. We report here the detection by the AGILE satellite on April 28, 2020 of an X-ray burst in coincidence with the very bright radio burst from the Galactic magnetar SGR 1935+2154. The burst detected by AGILE in the hard X-ray band (18-60 keV) lasts about 0.5 seconds, it is spectrally cutoff above 80 keV, and implies an isotropically emitted energy ~ $10^{40}$ erg. This event is remarkable in many ways: it shows for the first time that a magnetar can produce X-ray bursts in coincidence with FRB-like radio bursts; it also suggests that FRBs associated with magnetars may emit X-ray bursts of both magnetospheric and radio-pulse types that may be discovered in nearby sources. Guided by this detection, we discuss SGR 1935+2154 in the context of FRBs, and especially focus on the class of repeating-FRBs. Based on energetics, magnetars with fields B ~ $10^{15}$ G may power the majority of repeating-FRBs. Nearby repeating-FRBs offer a unique occasion to consolidate the FRB-magnetar connection, and we present new data on the X-ray monitoring of nearby FRBs. Our detection enlightens and constrains the physical process leading to FRBs: contrary to previous expectations, high-brightness temperature radio emission coexists with spectrally-cutoff X-ray radiation.
A Coherent Search for New Galactic Magnetars using Fermi/GBM and follow-up Swift/BAT: 7 Candidates and a Large Burst Catalog
Weizmann Institute of Science（魏茨曼科学研究所）；University of California at Santa Barbara（加州大学圣塔芭芭拉分校）；International Centre for Theoretical Sciences, Tata Institute of Fundamental Research（印度基本研究学院国际理论科学中心）
National Changhua University of Education（国立彰化师范大学）；Kyoto University（京都大学）；RIKEN Center for Advanced Photonics (RAP)（理化学研究所先进光子学中心）；NASA Goddard Space Flight Center（美国国家航空航天局戈达德太空飞行中心）；University of Maryland, Baltimore County（马里兰大学巴尔的摩县分校）；The George Washington University（乔治华盛顿大学）；Haverford College（哈弗福德学院）；University of Maryland, College Park（马里兰大学帕克分校）；Center for Research and Exploration in Space Science and Technology, NASA/GSFC（NASA/戈达德太空飞行中心空间科学与技术探索研究中心）；University of Cagliari（卡利亚里大学）；Institut de Recherche en Astrophysique et Planétologie, UPS-OMP, CNRS, CNES（天体物理学与行星学研究所以）
Eclipsed X-ray Bursts from Magnetar SGR J1935+2154 and the Fireball Measurements
Central China Normal University（华中师范大学）；Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）；National Astronomical Data Center（国家天文数据中心）；University of Chinese Academy of Sciences（中国科学院大学）
GECAM Observations of the Galactic Magnetar SGR J1935+2154 during the 2021 and 2022 Burst Active Episodes. I. Burst Catalog
Central China Normal University（华中师范大学）；Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）；Hebei Normal University（河北师范大学）；Beijing Normal University（北京师范大学）；Dezhou University（德州学院）
Modeling magnetar outbursts: Flux enhancements and the connection with short bursts and glitches
最近从磁星爆发中收集到的大量观测数据的可用性要求对爆发特征进行完整的理论研究。在这封信（一系列致力于模型磁星爆发的第一封）中，我们解决了长期存在的公开问题，即短爆发和故障是否总是与长期辐射爆发有关。我们表明，最近检测到的短爆发和故障似乎无关的爆发只是误导我们对这些事件的理解。我们表明，在星震模型的框架内，中微子发射过程中的磁星地壳限制的温度，因此光度。这种对最大亮度的自然限制使得与明亮的持久磁星相关的爆发几乎无法检测到。这些事件被简单地看作是在已经明亮的静止状态上的一个小的光度增加，然后快速返回到静止状态。特别是1 RXS J1708-4009，1 E 1841-045，SGR 1806-20和其他明亮的持久磁星。另一方面，在较暗的源中，类似的事件（具有相同的能量）将导致更极端的光度变化和更长的冷却时间，如XTE J1810-197，1 E 1547-5408和SGR 1627-41。我们的结论是，没有检测到大的辐射爆发与故障和爆发从明亮的持久磁星本身并不奇怪，也不需要任何修改的故障和爆发机制解释目前的理论模型。
The First Day in the Life of a Magnetar: Evolution of the Inclination Angle, Magnetic Dipole Moment and Braking Index of Millisecond Magnetars During Gamma-Ray Burst Afterglows
17 Yr of Magnetar Bursts Observed with the Fermi Gamma-ray Burst Monitor
University of Alabama in Huntsville（亨茨维尔阿拉巴马大学）；Sabancı University, Faculty of Engineering and Natural Sciences（萨班哲大学工程与自然科学学院）；Beijing Normal University（北京师范大学）；Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University（北京师范大学天文与前沿科学研究院）；Universities Space and Research Association（大学空间研究协会）；University of Galway（高威大学）；Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville（亨茨维尔阿拉巴马大学空间等离子体与高空大气研究中心）；Rice University（莱斯大学）
