论文标题
一项深度Chandra X射线天文台研究对球状群集Terzan 5
A Deep Chandra X-ray Observatory Study of the Millisecond Pulsar Population in the Globular Cluster Terzan 5
论文作者
论文摘要
我们介绍了745.6 ks的档案X射线观测站高级CCD成像光谱仪的数据，该数据在2000年至2016年之间在丰富的银河球群Terzan 5中的毫秒Pulsar（MSP）种群中累积了，发现具有精确位置的37个MSP中的8个。 Despite the deep exposure, the remaining MSPs are either marginally detected or have no obvious X-ray counterparts, which can be attributed to the typically soft thermal spectra of rotation-powered MSPs, which are strongly attenuated by the high intervening absorbing column (~$10^{22}$ cm$^{-2}$) towards the cluster, and in some instances severe source crowding/blending.对于“红back” MSP二进制文件，PSRS J1748-2446P和J1748-2446AD以及“黑寡妇”二进制PSRS J1748-2446O，我们发现在轨道上与内部震动的大量时期一致的大亮度X射线可变性的明确证据。群集中的第三个红带MSP PSR J1748-2446A在时间尺度上显示出大量的幅度变化，这是由于状态过渡或次级恒星的强烈耀斑发作而引起的。
We present an analysis of 745.6 ks of archival Chandra X-ray Observatory Advanced CCD Imaging Spectrometer data accumulated between 2000 and 2016 of the millisecond pulsar (MSP) population in the rich Galactic globular cluster Terzan 5. Eight of the 37 MSPs with precise positions are found to have plausible X-ray source matches. Despite the deep exposure, the remaining MSPs are either marginally detected or have no obvious X-ray counterparts, which can be attributed to the typically soft thermal spectra of rotation-powered MSPs, which are strongly attenuated by the high intervening absorbing column (~$10^{22}$ cm$^{-2}$) towards the cluster, and in some instances severe source crowding/blending. For the "redback" MSP binaries, PSRs J1748-2446P and J1748-2446ad, and the "black widow" binary PSRs J1748-2446O, we find clear evidence for large-amplitude X-ray variability at the orbital period consistent with an intrabinary shock origin. The third redback MSP in the cluster, PSR J1748-2446A, shows large amplitude variations in flux on time scales of years, possibility due to state transitions or intense flaring episodes from the secondary star.
