论文标题
从钱德拉档案数据发现了三个候选磁铁供电的快速X射线瞬变
Discovery of Three Candidate Magnetar-powered Fast X-ray Transients from Chandra Archival Data
论文作者
论文摘要
有人提出，可以在二进制中子星级合并中形成残余稳定磁力，从而导致快速X射线瞬态（FXT）可以持续数千秒。最近，Xue等。提出CDF-SX2完全是一种来源。如果得到确认，则可以使用这种发射来寻找来自二进制中子星形合并的引力波事件的电磁对应物，这些合并的脉冲脉冲合并较短，伽马射线爆发短，并且相应的余滴离轴离轴较弱，因此太弱而无法检测到。在这里，我们从Chandra Archival数据的初步搜索中报告了三个新的FXTS，XRT 170901，XRT 030511和XRT 110919的发现。与CDF-S XT2相似，这些新的FXT的增长非常快（不到几秒钟）和X射线助焊剂$ \ sim $ \ sim $$ 1.0 \ times10^{ - 12} $ erg s $^{ - 1} $ cm $ cm $^{ - 2} $持续的1-2 ks，随后是一个陡峭的decay。他们的光学/红外线（如果存在）非常薄弱，反对这些FXT的出色耀斑起源。对于XRT 170901，我们在郊区确定了一个带有源的微弱的主机星系，与CDF-S XT2非常相似。因此，我们新发现的FXT也是由二进制中子星合并导致的磁力动力X射线瞬变的强大候选者。
It was proposed that a remnant stable magnetar could be formed in a binary neutron-star merger, leading to a fast X-ray transient (FXT) that can last for thousands of seconds. Recently, Xue et al. suggested that CDF-S XT2 was exactly such a kind of source. If confirmed, such emission can be used to search for electromagnetic counterparts to gravitational wave events from binary neutron-star mergers that have short gamma-ray bursts and the corresponding afterglows seen off-axis and thus too weak to be detected. Here we report the discovery of three new FXTs, XRT 170901, XRT 030511, and XRT 110919, from preliminary search over Chandra archival data. Similar to CDF-S XT2, these new FXTs had a very fast rise (less than a few ten seconds) and a plateau of X-ray flux $\sim$$1.0\times10^{-12}$ erg s$^{-1}$ cm$^{-2}$ lasting for 1-2 ks, followed by a steep decay. Their optical/IR counterparts, if present, are very weak, arguing against a stellar flare origin for these FXTs. For XRT 170901, we identified a faint host galaxy with the source at the outskirts, very similar to CDF-S XT2. Therefore, our newly discovered FXTs are also strong candidates for magnetar-powered X-ray transients resulting from binary neutron star mergers.
