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arXiv 2502.02130astro-ph.HE
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在 MWA 成像巡天中通过单脉冲发现一颗类 RRAT 脉冲星

Discovery of an RRAT-like pulsar via its single pulses in an MWA imaging survey

Samuel J. McSweeney, Jared Moseley, Natasha Hurley-Walker, Garvit Grover, Csanád Horváth, Timothy J. Galvin, Bradley W. Meyers, Chia Min Tan

AI总结:

本文报告在 MWA 全天扩展成像巡天中发现脉冲星 PSR J0031−5726,其兼具 RRAT 式偶发亮脉冲与持续暗脉冲,偏振和旋转测度变化剧烈,可能代表正常脉冲星与 RRAT 之间的过渡类型。

摘要:

我们报告了在银河系与河外全天 MWA 扩展成像巡天中,于银纬 b ≈ -60° 处发现 PSR J0031−5726。该脉冲星既表现出偶发的、极亮的脉冲,令人联想到旋转射电暂现源(RRATs),也表现出持续的、较暗的脉冲。亮脉冲倾向于比较暗脉冲到达更晚的旋转相位,并且具有剧烈变化的偏振角曲线,以至于积分轮廓几乎完全退偏振到系统噪声水平。发现单个脉冲的旋转测度有时变化高达约 0.8 rad/m²,但在其他情况下通常与其平均值(电离层校正后)10.0 ± 0.1 rad/m² 一致。我们推测 J0031−5726 可能代表一类介于正常脉冲星与 RRATs 之间的脉冲星。

英文摘要:

We report the discovery of PSR J0031$-$5726 in the GaLactic and Extragalactic All-sky MWA eXtended imaging survey at a Galactic latitude of $b \approx -60^\circ$. The pulsar exhibits both sporadic, extremely bright pulses reminiscent of rotating radio transients (RRATs) as well as a persistent, dimmer pulses. The bright pulses tend to arrive at later rotation phases than their dimmer counterparts, and have dramatically varying polarization angle curves, such that the integrated profile appears almost completely depolarized down to the system noise level. The rotation measure of individual pulses was found to sometimes vary by up to ${\sim}0.8\,$rad/m$^2$, but was otherwise generally consistent with its average (ionosphere-corrected) value of $10.0 \pm 0.1\,$rad/m$^2$. We surmise that J0031$-$5726 may represent a class of pulsar that is intermediate between normal pulsars and RRATs.

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。

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