We present our broadband (2 - 250 keV) time-averaged spectral analysis of 388 bursts from SGR J1550-5418, SGR 1900+14 and SGR 1806-20 detected with the Rossi X-ray Timing Explorer (RXTE) here and as a database in a companion web-catalog. We find that two blackbody functions (BB+BB), sum of two modified blackbody functions (LB+LB), sum of blackbody and powerlaw functions (BB+PO) and a power law with a high energy exponential cut-off (COMPT) all provide acceptable fits at similar levels. We performed numerical simulations to constrain the best fitting model for each burst spectrum and found that 67.6% burst spectra with well-constrained parameters are better described by the Comptonized model. We also found that 64.7% of these burst spectra are better described with LB+LB model, which is employed in SGR spectral analysis for the first time here, than BB+BB and BB+PO. We found a significant positive lower bound trend on photon index, suggesting a decreasing upper bound on hardness, with respect to total flux and fluence. We compare this result with bursts observed from SGR and AXP sources and suggest the relationship is a distinctive characteristic between the two. We confirm a significant anti-correlation between burst emission area and blackbody temperature and find that it varies between the hot and cool blackbody temperatures differently than previously discussed. We expand on the interpretation of our results in the framework of strongly magnetized neutron star case.
Broadband X-ray Spectral Investigations of Magnetars, 4U 0142+61, 1E 1841-045, 1E 2259+586, and 1E 1048.1-5937
我们已经产生了一个扩展版本,而简化,但物理上面向三维磁星发射模型,STEMS 3D,允许光谱调查高达100千电子伏。然后,我们将其应用到四个磁星的宽带光谱:4U 0142+61,1 E 1841-045,1 E 2259+586和1 E 1048.1-5937,使用的数据在软X射线Swift/XRT或XMM-牛顿,和核光谱望远镜阵列在硬X射线波段。我们发现,4U 0142+61的硬X射线发射与早期的探测相比在光谱上是硬的,这表明该源可能处于向更硬的状态或从更硬的状态转变的过程中。我们发现,这四个磁星的表面性质是一致的,我们已经得到了只使用软X射线数据与STEMS 3D,这意味着我们的物理动机的磁星发射模型是一个强大的工具。基于我们的宽带光谱调查,我们得出结论,磁层中的表面光子的共振散射单独不能占硬X射线发射磁星,因此,一个额外的非热过程,或人口的相对论电子是必需的。我们还讨论了在1 E 1048.1-5937中未检测到持续硬X射线发射的含义。
A Broadband Emission Model of Magnetar Wind Nebulae
等离子体风引起的角动量损失被认为是孤立中子星(包括磁星)的普遍特征。由磁星提供动力的风星云使我们能够比较磁星与旋转动力磁星(RPPs)的风特性和自旋演化。本文建立了一个磁星风星云的宽带辐射模型。该模型是类似于过去的研究年轻的脉冲星风星云(PWNe)周围的RPP,但修改的应用程序MWNe的观测信息远远少于年轻的PWNe。我们应用该模型的MWN周围的最年轻的($\sim$ 1 kyr)磁星1 E 1547.0-5408,具有最大的自旋功率$L_{\rm spin}$在所有的磁星。然而,与年轻的RPP相比,MWN是微弱的,因为1 E 1547.0-5408的低$L_{\rm spin}$。由于大多数参数仅受MWN的X射线通量上限的约束,因此我们采用PSR J1846-0258附近的年轻PWN Kes 75的模型参数,这是一个特殊的RPP,表现出类似磁星的行为。该模型预测了$γ$射线通量,该通量将在未来的TeV $γ$射线观测中被{ \it CTA}探测到。MWN光谱不允许我们检验1 E 1547.0-5408在其诞生时具有毫秒周期的假设,因为注入演化早期阶段的粒子遭受严重的绝热和同步加速器损失。进一步的观测和理论研究磁星周围的风星云需要约束磁星的风和自旋的属性。
Low-energy Radio Bursts from Magnetar XTE J1810$-$197: Implications for Fast Radio Bursts
National Centre for Radio Astrophysics, Tata Institute of Fundamental Research(国家射电天文中心,塔塔基础研究所);Center for Astrophysics & Space Science (CASS), NYU Abu Dhabi(天体物理学与空间科学中心,纽约大学阿布扎比分校);Department of Physics, New York University(物理系,纽约大学);Center for Cosmology and Particle Physics (CCPP, Affiliate), New York University(宇宙学与粒子物理中心(附属),纽约大学)
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。
INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano(意大利国家天体物理研究所空间与宇宙物理学米兰研究所);INAF, Osservatorio Astronomico di Cagliari(意大利国家天体物理研究所卡利亚里天文台)
INTEGRAL IBIS仪器分析了20余年的数据,发现了1349次磁星爆发,揭示了爆发流量分布和能量特征,特别是SGR 1806-20的峰值能量与流量反相关性。
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)