论文标题
M28中的中子星人口：Chandra/GBT联合观察Pulsar Paradise
The neutron star population in M28: a joint Chandra/GBT look at pulsar paradise
论文作者
论文摘要
我们使用整个330-KS 2002-2015 ACIS数据集对球形群集M28（NGC 6626）中中性恒星（NS）人群进行深入研究的结果，并从Chandra X射线观测和协调的无线电观察结果与绿色银行望远镜（GBT）进行了协调的无线电观察。簇中的7个已知的紧凑型二进制二进制脉冲星（MSP）。我们报告了两个同时检测REDBECK PSR J1824-2452I（M28i）及其X射线对应物。我们在其脉冲星状态下发现了M28i中的双峰X射线轨道通量调制，围绕脉冲星下部连接。我们分析了静态中子恒星低质量X射线二进制的光谱，以限制其质量和半径。使用氢和氦气大气模型，我们发现NS半径为r = 9.5-11.5 km和r = 13.5-16.7 km，中子星质量为1.4 msun。我们还搜索了46个最亮X射线源的长期变异性，并报告了M28中六个新变量X射线源的发现。
We present the results of a deep study of the neutron star (NS) population in the globular cluster M28 (NGC 6626), using the full 330-ks 2002-2015 ACIS dataset from the Chandra X-ray Observatory and coordinated radio observations taken with the Green Bank Telescope (GBT) in 2015. We investigate the X-ray luminosity (Lx), spectrum, and orbital modulation of the 7 known compact binary millisecond pulsars (MSPs) in the cluster. We report two simultaneous detections of the redback PSR J1824-2452I (M28I) and its X-ray counterpart. We discover a double-peaked X-ray orbital flux modulation in M28I during its pulsar state, centered around pulsar inferior conjunction. We analyze the spectrum of the quiescent neutron star low-mass X-ray binary to constrain its mass and radius. Using both hydrogen and helium NS atmosphere models, we find a NS radius of R = 9.5-11.5 km and R = 13.5 - 16.7 km, respectively, for a neutron star mass of 1.4 Msun. We also search for long-term variability in the 46 brightest X-ray sources and report the discovery of six new variable low luminosity X-ray sources in M28.
