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arXiv 1608.09008astro-ph.HE
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在PALFA调查中发现了两个长期间歇性的彗星

Two long-term intermittent pulsars discovered in the PALFA Survey

A. G. Lyne, B. W. Stappers, P. C. C. Freire, J. W. T. Hessels, V. M. Kaspi, B. Allen, S. Bogdanov, A. Brazier, F. Camilo, F. Cardoso, S. Chatterjee, J. M. Corde… 展开作者

A. G. Lyne, B. W. Stappers, P. C. C. Freire, J. W. T. Hessels, V. M. Kaspi, B. Allen, S. Bogdanov, A. Brazier, F. Camilo, F. Cardoso, S. Chatterjee, J. M. Cordes, F. Crawford, J. S. Deneva, R. D. Ferdman, F. A. Jenet, B. Knispel, P. Lazarus, J. van Leeuwen, R. Lynch, E. Madsen, M. A. McLaughlin, E. Parent, C. Patel, S. M. Ransom, P. Scholz, A. Seymour, X. Siemens, L. G. Spitler, I. H. Stairs, K. Stovall, J. Swiggum, R. S. Wharton, W. W. Zhu

摘要:

我们报告的发现,两个长期间歇性的射电望远镜在正在进行的阿雷西博PALFA脉冲星调查。随着阿雷西博望远镜的发现,在Jodrell Bank天文台对这些恒星进行了多年的长期观测,揭示了它们的旋转和辐射特性的细节。PSR J1910+0517和J1929+1357显示了长期极端的双峰不稳定性,在活动(ON)和非活动(OFF)发射状态之间切换,并表明存在大量迄今未被识别的此类物体的潜在种群。对于PSR J1929+1357,初始占空比为fON=0.008,但两年后突然变为fON=0.16。这是第一次观察到间歇性脉冲星活动的显着演变,我们表明脉冲星的自转速率与活动成正比。PSR J1929+1357在主动模式下的自旋下降率增加了1.8倍,与其他三个已知的长期间歇性彗星相似。

英文摘要:

We report the discovery of two long-term intermittent radio pulsars in the ongoing Arecibo PALFA pulsar survey. Following discovery with the Arecibo Telescope, extended observations of these pulsars over several years at Jodrell Bank Observatory have revealed the details of their rotation and radiation properties. PSRs J1910+0517 and J1929+1357 show long-term extreme bi-modal intermittency, switching between active (ON) and inactive (OFF) emission states and indicating the presence of a large, hitherto unrecognised, underlying population of such objects. For PSR J1929+1357, the initial duty cycle was fON=0.008, but two years later this changed, quite abruptly, to fON=0.16. This is the first time that a significant evolution in the activity of an intermittent pulsar has been seen and we show that the spin-down rate of the pulsar is proportional to the activity. The spin-down rate of PSR J1929+1357 is increased by a factor of 1.8 when it is in active mode, similar to the increase seen in the other three known long-term intermittent pulsars.

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