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arXiv 2102.04026astro-ph.HE
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用GMRT和费米-LAT在射电和伽马射线中发现和计时三个毫秒射电星

Discovery and timing of three millisecond pulsars in radio and gamma-rays with the GMRT and Fermi-LAT

B. Bhattacharyya, J. Roy, T. J. Johnson, P. S. Ray, P. C. C. Freire, Y. Gupta, D. Bhattacharya, A. Kaninghat, B. W. Stappers, E. C. Ferrara, S. Sengupta, R. S. … 展开作者

B. Bhattacharyya, J. Roy, T. J. Johnson, P. S. Ray, P. C. C. Freire, Y. Gupta, D. Bhattacharya, A. Kaninghat, B. W. Stappers, E. C. Ferrara, S. Sengupta, R. S. Rathour, M. Kerr, D. A. Smith, P. M. Saz Parkinson, S. M. Ransom, P. F. Michelson

摘要:

我们使用巨型米波射电望远镜(GMRT)在322和607 MHz进行了深入的观测,以寻找375个非关联费米大面积望远镜(LAT)伽马射线源方向的射电脉动。本文报道了三个毫秒级双星(MSP)的发现,PSR J0248 + 4230,PSR J1207 $-$ 5050和PSR J1536 $-$ 4948。我们用GMRT进行了大约5年的跟踪定时观测,并为这些MSP推导了相位相干定时模型。PSR J0248 $+$ 4230和J1207 $-$ 5050是孤立的MSP,周期分别为2.60 ms和4.84 ms。PSR J1536 - 4948是双星系统中的一颗3.07 ms脉冲星,其轨道周期约为62天,围绕一颗最小质量为0.32太阳质量的伴星。我们还提供了来自GMRT观测的这些MSP的多频脉冲轮廓。PSR J1536 - 4948是一种MSP,具有极宽的脉冲轮廓,具有多个分量。使用无线电计时星历,我们随后检测到伽马射线脉动从这三个MSP,确认他们作为源动力的伽马射线发射。对于PSR J1536 - 4948,我们使用大约11.6年的伽马射线脉冲到达时间(TOA)以及无线电TOA进行了联合无线电伽马射线计时。PSR J1536 - 4948还显示了脉冲伽马射线发射超过25 GeV的证据,证实了这个MSP与> 10 GeV点源的早期关联。所有三个MSP的多波长脉冲轮廓为脉冲星磁层中的无线电和伽马射线发射模型提供了挑战。

英文摘要:

We performed deep observations to search for radio pulsations in the directions of 375 unassociated Fermi Large Area Telescope (LAT) gamma-ray sources using the Giant Metrewave Radio Telescope (GMRT) at 322 and 607 MHz. In this paper we report the discovery of three millisecond pulsars (MSPs), PSR J0248+4230, PSR J1207$-$5050 and PSR J1536$-$4948. We conducted follow up timing observations for around 5 years with the GMRT and derived phase coherent timing models for these MSPs. PSR J0248$+$4230 and J1207$-$5050 are isolated MSPs having periodicities of 2.60 ms and 4.84 ms. PSR J1536-4948 is a 3.07 ms pulsar in a binary system with orbital period of around 62 days about a companion of minimum mass 0.32 solar mass. We also present multi-frequency pulse profiles of these MSPs from the GMRT observations. PSR J1536-4948 is an MSP with an extremely wide pulse profile having multiple components. Using the radio timing ephemeris we subsequently detected gamma-ray pulsations from these three MSPs, confirming them as the sources powering the gamma-ray emission. For PSR J1536-4948 we performed combined radio-gamma-ray timing using around 11.6 years of gamma-ray pulse times of arrivals (TOAs) along with the radio TOAs. PSR J1536-4948 also shows evidence for pulsed gamma-ray emission out to above 25 GeV, confirming earlier associations of this MSP with a >10 GeV point source. The multi-wavelength pulse profiles of all three MSPs offer challenges to models of radio and gamma-ray emission in pulsar magnetospheres.

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