论文标题
大麦芽云中的三个新的高质量X射线二进制
Three new high-mass X-ray binaries in the Large Magellanic Cloud
论文作者
论文摘要
麦哲伦云的高质量X射线二进制（HMXB）系统拥有大量，但尽管大型麦哲伦云（LMC）的数量级比小的麦哲伦云高，但已知的HMXB较少。我们在XMM-Newton观测中搜索了新的HMXB，我们进行了研究，以研究超级壳LMC5和LMC7中的Supernova Remnant候选者。这三个观察到的字段位于区域中，这在X射线之前很少探索。我们分析了XMM-Newton数据，以寻找具有硬X射线频谱的来源，以及具有光学色和典型的HMXBS亮度的对应物。我们报告了三个新的BE/X射线二进制文件的发现，其中两个在其X射线通量中显示出脉动。 LMC7中的XMMU J045315.1-693242的发光度为6.5e34 erg/s，相对X射线相对微弱。 V = 15.5 mag的长期OGLE I波段光线曲线表明，二进制系统的49.6天或24.8天的轨道周期。 XMMU J045736.9-692727，也位于LMC7中的XMMU J045736.9-692727亮度更明亮，亮度为5.6e35 erg/s，硬谱和硬谱为0.63，幂律光子指数为0.63。 X射线通量显示出明显的脉动，周期为317.7 s。我们使用盐-HRS光谱仪从V = 14.2 MAG对应物获得了光学高分辨率光谱。在发射中观察到HALPHA和HBETA，其复杂线曲线和等效宽度分别为-8.0 A和-1.3 A。从Ogle获得的I带光曲线显示了一系列四个强烈的爆发，然后在73-165天内突然下降了超过1个MAG，并在爆发前恢复到水平。 RX J0524.2-6620先前被归类为X射线二进制候选者，位于LMC5的东部。我们报告了360.7 S脉动的发现。 （简略）
The Magellanic Clouds host a large population of high-mass X-ray binary (HMXB) systems, but although the Large Magellanic Cloud (LMC) is an order of magnitude more massive than the Small Magellanic Cloud, significantly fewer HMXBs are known. We conducted a search for new HMXBs in XMM-Newton observations, which we performed to investigate supernova remnant candidates in the supergiant shells LMC5 and LMC7. The three observed fields are located in regions, which were little explored in X-rays before. We analysed the XMM-Newton data to look for sources with hard X-ray spectrum and counterparts with optical colours and brightness typical for HMXBs. We report the discovery of three new Be/X-ray binaries, two of them showing pulsations in their X-ray flux. With a luminosity of 6.5e34 erg/s, XMMU J045315.1-693242 in LMC7 was relatively X-ray faint. The long-term OGLE I-band light curve of the V = 15.5 mag counterpart suggests a 49.6 day or 24.8 day orbital period for the binary system. XMMU J045736.9-692727, also located in LMC7 was brighter with a luminosity of 5.6e35 erg/s and hard spectrum with a power-law photon index of 0.63. The X-ray flux revealed clear pulsations with a period of 317.7 s. We obtained optical high resolution spectra from the V = 14.2 mag counterpart using the SALT-HRS spectrograph. Halpha and Hbeta were observed in emission with complex line profiles and equivalent widths of -8.0 A and -1.3 A, respectively. The I-band light curve obtained from OGLE shows a series of four strong outbursts followed by a sudden drop in brightness by more than 1 mag within 73-165 days and a recovery to the level before the outbursts. RX J0524.2-6620, previously classified as X-ray binary candidate, is located at the eastern part of LMC5. We report the discovery of 360.7 s pulsations. (abridged)
