Universal detection of high-temperature emission in X-ray isolated neutron stars
Universal detection of high-temperature emission in X-ray isolated neutron stars
复制标题
X射线孤立中子星高温发射的通用检测
DOI：
10.1093/pasj/psy135
复制
发表时间：
2019
影响因子：
2.3
通讯作者：
Matsumoto Hironori
中科院分区：
文献类型：
--
作者：
Yoneyama Tomokage;Hayashida Kiyoshi;Nakajima Hiroshi;Matsumoto Hironori
强磁化孤立中子星（NSs）主要根据其磁场强度分为两类。具有较高磁场（1014-1015G）的称为磁星，其特征是重复的短爆发，其他是具有1013G的x射线隔离中子星（XINSs）。磁星和XINSs在x射线中都有热辐射，但一直认为磁星的热谱可以用双温黑体（2BB）再现，而XINSs的热谱只能用单温黑体（1BB）再现，而且温度低于磁星。根据磁场和温度，人们经常推测XINSs可能是古老的冷却磁星。在这里，我们报告说，除了1BB模型之外，所有七个已知的XINSs都显示出一个高能成分。用最高的统计数据分析XMM-Newton对XINSs的所有数据，我们发现它们的x射线光谱都是用2BB模型再现的，类似于磁星。它们的辐射半径和温度比也与磁星相似，但有两个XINSs的辐射半径明显小于其他的。XINSs和磁星在x射线光谱上的惊人相似性表明它们的发射源是相同的。如果新星星比磁星更古老，就可以解释新星星的较低温度。因此，这些结果是一个观测指示，支持关于高磁化NSs分类的标准假设。
Strongly magnetized isolated neutron stars (NSs) are categorized into two families, according mainly to their magnetic field strength. Those with a higher magnetic field of 1014–1015G are called magnetars, characterized by repeated short bursts, and the others are X-ray isolated neutron stars (XINSs) with 1013G. Both magnetars and XINSs show thermal emission in X-rays, but it has been considered that the thermal spectrum of magnetars can be reproduced with a two-temperature blackbody (2BB), while that of XINSs shows only a single-temperature blackbody (1BB) and the temperature is lower than that of magnetars. On the basis of the magnetic field and temperature, it is often speculated that XINSs may be old and cooled magnetars. Here we report that all seven known XINSs show a high-energy component in addition to the 1BB model. Analyzing all the XMM-Newton data for the XINSs with the highest statistics ever achieved, we find that their X-ray spectra are all reproduced with a 2BB model, similar to magnetars. Their emission radii and temperature ratios are also similar to those of magnetars except for two XINSs, which show significantly smaller radii than the others. The remarkable similarity in the X-ray spectra between XINSs and magnetars suggests that the origins of their emissions are the same. The lower temperature in XINSs can be explained if XINSs are older than magnetars. Therefore, these results are an observational indication that supports the standard hypothesis on the classification of highly magnetized NSs.
登录
查看更多内容
使用 HST/ACS 成像重新审视孤立中子星 RX J185635−3754 的视差
DOI：
10.1088/0004-637x/724/1/669
发表时间：
2010
期刊：
The Astrophysical Journal
影响因子：
--
作者：
F. Walter;T. Eisenbeiss;J. Lattimer;B. Kim;V. Hambaryan;R. Neuhaeuser
通讯作者：
R. Neuhaeuser
影响因子：
6.5
作者：
D. Götz;S. Mereghetti;A. Tiengo;P. Esposito;P. Esposito
通讯作者：
D. Götz;S. Mereghetti;A. Tiengo;P. Esposito;P. Esposito
DOI：
10.1093/pasj/psx025
发表时间：
2017-03
期刊：
arXiv: High Energy Astrophysical Phenomena
影响因子：
--
作者：
T. Yoneyama;K. Hayashida;H. Nakajima;S. Inoue;H. Tsunemi
通讯作者：
T. Yoneyama;K. Hayashida;H. Nakajima;S. Inoue;H. Tsunemi
影响因子：
6.5
作者：
A. Pires;F. Haberl;V. Zavlin;C. Motch;S. Zane;M. Potsdam;M. F. Physik;NASA's Goddard Space Flight Center;Cnrs;U. Strasbourg;Observatoire Astronomique;Mullard Space Science Laboratory;A. Jena
通讯作者：
A. Pires;F. Haberl;V. Zavlin;C. Motch;S. Zane;M. Potsdam;M. F. Physik;NASA's Goddard Space Flight Center;Cnrs;U. Strasbourg;Observatoire Astronomique;Mullard Space Science Laboratory;A. Jena
将 HZ43 A、Sirius B 和 RX J185635-3754 建立为软 X 射线标准：Chandra LETG HRC-S、EUVE 光谱仪和 ROSAT PSPC 之间的交叉校准
DOI：
--
发表时间：
2006
期刊：
影响因子：
--
作者：
K. Beuermann;V. Burwitz;T. Astrophysik;U. Goettingen;H Germany;M. F. Physik;I. F. Astrophysik;U. Tuebingen
通讯作者：
U. Tuebingen