arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2503.08036astro-ph.HE
收藏

一个活跃了三十年的长周期射电瞬变源

A long-period radio transient active for three decades

N. Hurley-Walker, N. Rea, S. J. McSweeney, B. W. Meyers, E. Lenc, I. Heywood, S. D. Hyman, Y. P. Men, T. E. Clarke, F. Coti Zelati, D. C. Price, C. Horvath, T. … 展开作者

N. Hurley-Walker, N. Rea, S. J. McSweeney, B. W. Meyers, E. Lenc, I. Heywood, S. D. Hyman, Y. P. Men, T. E. Clarke, F. Coti Zelati, D. C. Price, C. Horvath, T. J. Galvin, G. E. Anderson, A. Bahramian, E. D. Barr, N. D. R. Bhat, M. Caleb, M. Dall'Ora, D. de Martino, S. Giacintucci, J. S. Morgan, K. M. Rajwade, B. Stappers, A. Williams

AI总结:

本文报道一个周期为21分钟、至少自1988年持续活跃的长周期射电瞬变源GPMJ1839-10,其周期导数上限对孤立中子星经典射电辐射模型构成挑战。

摘要:

最近已发现若干长周期射电瞬变源,其强偏振相干射电脉冲出现在数十秒至数千秒的时间尺度上[1,2]。在某些情况下,这些射电脉冲被解释为来自具有极强磁场的旋转中子星,即磁星;而其他一些偶尔呈周期性且采样较不充分的射电瞬变源的起源仍存在争议[3]。相干周期射电辐射通常用旋转偶极磁场和正负电子对产生机制来解释,但此类模型难以轻易预言自转如此缓慢的中子星会产生射电辐射,并使其在较长时间内得以维持。另一方面,强磁化的孤立白矮星被认为应具有较长的自转周期,但尚未从这些源中直接探测到周期性相干射电辐射。本文报告对一个长周期(21分钟)射电瞬变源的观测,我们将其命名为GPMJ1839-10。其脉冲亮度变化达两个数量级,持续时间在30至300秒之间,并具有准周期子结构。这些观测促使我们对射电档案进行检索,发现该源自至少1988年以来一直在重复爆发。档案数据使周期导数被限制为$<3.6\ imes10^{-13}$s s$^{-1}$,这处于任何预言孤立中子星偶极射电辐射的经典理论模型的极限位置。

英文摘要:

Recently several long-period radio transients have been discovered, with strongly polarised coherent radio pulses appearing on timescales between tens to thousands of seconds [1,2]. In some cases the radio pulses have been interpreted as coming from rotating neutron stars with extremely strong magnetic fields, known as magnetars; the origin of other, occasionally periodic and less well-sampled radio transients, is still debated [3]. Coherent periodic radio emission is usually explained by rotating dipolar magnetic fields and pair production mechanisms, but such models do not easily predict radio emission from such slowly-rotating neutron stars and maintain it for extended times. On the other hand, highly magnetic isolated white dwarfs would be expected to have long spin periodicities, but periodic coherent radio emission has not yet been directly detected from these sources. Here we report observations of a long-period (21 minutes) radio transient, which we have labeled GPMJ1839-10. The pulses vary in brightness by two orders of magnitude, last between 30 and 300 seconds, and have quasi-periodic substructure. The observations prompted a search of radio archives, and we found that the source has been repeating since at least 1988. The archival data enabled constraint of the period derivative to $<3.6\times10^{-13}$s s$^{-1}$, which is at the very limit of any classical theoretical model that predicts dipolar radio emission from an isolated neutron star.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑