DISCOVERY OF A REDBACK MILLISECOND PULSAR CANDIDATE: 3FGL J0212.1+5320
DISCOVERY OF A REDBACK MILLISECOND PULSAR CANDIDATE: 3FGL J0212.1+5320
复制标题
DOI：
10.3847/1538-4357/833/2/143
复制
发表时间：
2016-09
期刊：
影响因子：
--
通讯作者：
Kwan-Lok Li;A. Kong;X. Hou;J. Mao;J. Strader;L. Chomiuk;E. Tremou
中科院分区：
文献类型：
--
作者：
Kwan-Lok Li;A. Kong;X. Hou;J. Mao;J. Strader;L. Chomiuk;E. Tremou
我们给出了未知费米天体3FGL J0212.1+5320的多波长研究。在95%的误差椭圆内，钱德拉探测到一个明亮的X射线源(即Erg Cm−2 S−1)，它具有低质量的光学对应物(和K)。在20.87小时的光学/红外中显示了清晰的椭球调制。3FGL J0212.1+5320的伽马射线性质与毫秒脉冲星的伽马射线性质一致，表明它是一颗γ-ray redback(RB)脉冲星双星，其低质量伴星填充了罗氏叶的⪆%。如果得到证实，它将是一颗具有已知最长轨道周期之一的RB双星。2015年从丽江天文台获取的光谱数据没有显示出强发射线的证据，表明吸积目前处于不活跃状态(旋转驱动的脉冲星状态)。这与较低的X射线光度(ERG S−1)以及钱德拉和斯威夫特可能看到的X射线调制是一致的。考虑到3FGLJ0212.1+5320的X射线光度和较高的X射线/γ射线通量比(8%)都可以与两个已知的γ射线过渡态的MSP相媲美，我们怀疑3FGL J0212.1+5320可能是一个潜在的目标，用于寻找未来向吸积活跃态的跃迁。
We present a multiwavelength study of the unidentified Fermi object, 3FGL J0212.1+5320. Within the 95% error ellipse, Chandra detects a bright X-ray source (i.e., erg cm−2 s−1) that has a low-mass optical counterpart ( and K). A clear ellipsoidal modulation is shown in optical/infrared at 20.87 hr. The gamma-ray properties of 3FGL J0212.1+5320 are all consistent with that of a millisecond pulsar (MSP), suggesting that it is a γ-ray redback (RB) MSP binary with a low-mass companion filling ⪆64% of the Roche lobe. If confirmed, it will be an RB binary with one of the longest orbital periods known. Spectroscopic data taken in 2015 from the Lijiang observatory show no evidence of strong emission lines, revealing that the accretion is currently inactive (the rotation-powered pulsar state). This is consistent with the low X-ray luminosities ( erg s−1) and the possible X-ray modulation seen by Chandra and Swift. Considering that the X-ray luminosity and the high X-ray-to-γ-ray flux ratio (8%) are both comparable to those of the two known γ-ray transitional MSPs, we suspect that 3FGL J0212.1+5320 could be a potential target to search for future transition to the accretion active state.