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arXiv 2212.08528astro-ph.HE
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Fermi-LAT gamma-ray源的TRAPUM L波段巡天

The TRAPUM L-band survey for pulsars in Fermi-LAT gamma-ray sources

C. J. Clark, R. P. Breton, E. D. Barr, M. Burgay, T. Thongmeearkom, L. Nieder, S. Buchner, B. Stappers, M. Kramer, W. Becker, M. Mayer, A. Phosrisom, A. Ashok, … 展开作者

C. J. Clark, R. P. Breton, E. D. Barr, M. Burgay, T. Thongmeearkom, L. Nieder, S. Buchner, B. Stappers, M. Kramer, W. Becker, M. Mayer, A. Phosrisom, A. Ashok, M. C. Bezuidenhout, F. Calore, I. Cognard, P. C. C. Freire, M. Geyer, J. -M. Grießmeier, R. Karuppusamy, L. Levin, P. V. Padmanabh, A. Possenti, S. Ransom, M. Serylak, V. Venkatraman Krishnan, L. Vleeschower, J. Behrend, D. J. Champion, W. Chen, D. Horn, E. F. Keane, L. Künkel, Y. Men, A. Ridolfi, V. S. Dhillon, T. R. Marsh, M. A. Papa

摘要:

在费米大天区望远镜(LAT)探测到的伽马射线源的射电观测中,已经发现了100多个毫秒脉冲星(MSP),但仍有数百个脉冲星样源尚未确定。在这里,我们提出的第一个结果,从有针对性的调查费米-LAT源正在进行的瞬态和脉冲星与MeerKAT(TRAPUM)大型调查项目。我们观察到79个来源确定为可能的伽玛射线脉冲星候选人的随机森林分类的4FGL目录的无关源。使用MeerKAT的L波段接收器(856-1712 MHz)在两个独立的时期对每个源进行了10分钟的观测,典型的脉冲通量密度灵敏度为$\sim$ 100 $\,μ$ Jy。发现了9个新的MSP,其中8个在双星系统中,包括两个食红背和一个系统PSR J1526 $-$ 2744,它似乎有一个白矮星伴星在一个异常紧凑的5小时轨道上。我们获得了两个这些MSP的相位连接的定时解决方案,使费米-LAT数据中的伽马射线脉动的检测。使用Fermi-LAT计时星历表在高级LIGO数据中对PSR J1526 $-$ 2744的连续引力波进行了后续搜索,没有发现任何探测结果,但对中子星椭圆率设定了上限$2.45\times10^{-8}$。我们还在第一次eROSITA全天空巡天的数据中检测到红背PSR J1803 $-$ 6707的X射线发射,可能是由于双星内部激波的发射。

英文摘要:

More than 100 millisecond pulsars (MSPs) have been discovered in radio observations of gamma-ray sources detected by the Fermi Large Area Telescope (LAT), but hundreds of pulsar-like sources remain unidentified. Here we present the first results from the targeted survey of Fermi-LAT sources being performed by the Transients and Pulsars with MeerKAT (TRAPUM) Large Survey Project. We observed 79 sources identified as possible gamma-ray pulsar candidates by a Random Forest classification of unassociated sources from the 4FGL catalogue. Each source was observed for 10 minutes on two separate epochs using MeerKAT's L-band receiver (856-1712 MHz), with typical pulsed flux density sensitivities of $\sim$100$\,μ$Jy. Nine new MSPs were discovered, eight of which are in binary systems, including two eclipsing redbacks and one system, PSR J1526$-$2744, that appears to have a white dwarf companion in an unusually compact 5 hr orbit. We obtained phase-connected timing solutions for two of these MSPs, enabling the detection of gamma-ray pulsations in the Fermi-LAT data. A follow-up search for continuous gravitational waves from PSR J1526$-$2744 in Advanced LIGO data using the resulting Fermi-LAT timing ephemeris yielded no detection, but sets an upper limit on the neutron star ellipticity of $2.45\times10^{-8}$. We also detected X-ray emission from the redback PSR J1803$-$6707 in data from the first eROSITA all-sky survey, likely due to emission from an intra-binary shock.

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