一颗极亮的偶发射电脉冲星的发现
Discovery of an Extremely Luminous Sporadic Radio Pulsar
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中文总结 AI 辅助
研究人员借助CHIME/FRB发现极亮偶发RRAT PSR J2108+5055，测定其多项天体物理参数，估算同类源数量，还证实FAST可在本星系群内探测到该脉冲星的脉冲。
中文摘要 AI 辅助
我们使用加拿大氢强度测绘实验/快速射电暴仪器（CHIME/FRB）发现了PSR J2108+5055，这是一颗极亮但存在偶发模式变化的旋转射电暂现源（RRAT），周期为0.495秒。假设由色散量推导得出的距离为1.6±0.3千秒差距，我们测得PSR J2108+5055最亮脉冲的流量密度为3.1±1.0千央斯基，对应谱光度为(7.5±2.3)×10²³尔格每秒每赫兹。我们给出PSR J2108+5055的工作周期上限为0.002%，并测得其表面磁场为5.8×10¹¹高斯、特征年龄为1.2×10⁷年、自转减慢光度为2.2×10³²尔格每秒。利用基于绿岸北天盖（GBNCC）巡天的简单模型，我们在GBNCC巡天区域内，对具有相似峰值流量密度的PSR J2108+5055类源数量给出上限约80个RRAT。我们还表明，若将PSR J2108+5055置于本星系群边缘，五百米口径球面射电望远镜（FAST）将能探测到其最亮脉冲；其第二亮脉冲的峰值流量密度为1.5±0.7千央斯基，FAST可在约1兆秒差距外探测到此类脉冲，覆盖包括仙女座在内的本星系群内部区域。
英文摘要
We have discovered PSR J2108+5055, an extremely luminous but sporadic mode-changing rotating radio transient (RRAT), with a period of 0.495 s using the Canadian Hydrogen Intensity Mapping Experiment/Fast Radio Burst instrument (CHIME/FRB). We show that the brightest pulse from PSR J2108+5055 has a flux density of 3.1+/-1.0 kJy, corresponding to a spectral luminosity of (7.5+/-2.3)x10^23 erg s^-1 Hz^-1, assuming a dispersion-measure-derived distance of 1.6+/-0.3 kpc. We place an upper limit on the duty cycle of PSR J2108+5055 at 0.002% and measure a surface magnetic field of 5.8x10^11 G, a characteristic age of 1.2x10^7 yr, and a spindown luminosity of 2.2x10^32 erg s^-1. Using a simple model based on the Green Bank North Celestial Cap (GBNCC) survey, we place an upper limit on the number of PSR J2108+5055-like sources with similar peak flux densities in the GBNCC survey area of ~80 RRATs. We show that if PSR J2108+5055 were placed at the edge of the Local Group of galaxies, the Five-Hundred-Meter Aperture Spherical Telescope (FAST) would detect its brightest pulse. The second brightest pulse has a peak flux density of 1.5+/-0.7 kJy, and FAST would detect such a pulse out to ~1 Mpc, covering the inner Local Group, including Andromeda.
