UvA-DARE (Digital Academic Repository) A search for radio pulsars and fast transients in M31 using the Westerbork Synthesis Radio Telescope
UvA-DARE (Digital Academic Repository) A search for radio pulsars and fast transients in M31 using the Westerbork Synthesis Radio Telescope
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UvA-DARE（数字学术知识库）使用 Westerbork 综合射电望远镜搜索 M31 中的射电脉冲星和快速瞬变
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发表时间：
2012
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通讯作者：
R. Braun
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作者：
E. Rubio;B. Stappers;J. Hessels;R. Braun
我们提出了最敏感和最全面的调查尚未进行的射电望远镜和快速瞬变的仙女座星系（M31）及其卫星，使用韦斯特博克合成射电望远镜（WSRT）在328 MHz的中心频率的结果。我们在一种特殊的配置中使用了WSRT，称为8 gr 8（八光栅）模式，它提供了一个大的瞬时视场，约为5 deg 2指向-1，具有良好的灵敏度，长停留时间（长达8 h指向-1）和良好的空间分辨率（几弧分）用于定位源。我们已经在我们的数据中搜索了周期性和单脉冲，旨在检测明亮的，持久的射电暴和银河系或河外起源的旋转射电瞬变（RRAT）。我们的搜索没有发现任何确认的周期性信号或来自（潜在的）宇宙学距离的明亮的单次爆发。然而，我们确实报告了几个单脉冲事件的检测，其中一些重复在相同的色散措施，这可能是潜在的起源于中子星在M31。其中一个被多次观测到，包括在2000 s内的6个脉冲的爆发，其色散测量值为54.7 pc cm − 3，这可能将这个源的起源置于我们的银河系之外。我们的研究结果进行了比较，在M31的一系列假设的人口的恒星和RRATs，并允许我们约束的光度函数的恒星在M31。他们还表明，除非M31中的脉冲星比我们银河系中的脉冲星要暗得多，否则没有必要对脉冲星的距离平方反比定律提出任何违反。
We present the results of the most sensitive and comprehensive survey yet undertaken for radio pulsars and fast transients in the Andromeda galaxy (M31) and its satellites, using the Westerbork Synthesis Radio Telescope (WSRT) at a central frequency of 328 MHz. We used the WSRT in a special configuration called 8gr8 (eight-grate) mode, which provides a large instantaneous field of view, about 5 deg 2 pointing − 1 , with good sensitivity, long dwell times (up to 8 h pointing − 1 ) and good spatial resolution (a few arcminutes) for locating sources. We have searched for both periodicities and single pulses in our data, aiming to detect bright, persistent radio pulsars and rotating radio transients (RRATs) of either Galactic or extragalactic origin. Our searches did not reveal any confirmed periodic signals or bright single bursts from (potentially) cosmological distances. However, we do report the detection of several single-pulse events, some repeating at the same dispersion measure, which could potentially originate from neutron stars in M31. One in particular was seen multiple times, including a burst of six pulses in 2000 s, at a dispersion measure of 54.7 pc cm − 3 , which potentially places the origin of this source outside our Galaxy. Our results are compared to a range of hypothetical populations of pulsars and RRATs in M31 and allow us to constrain the luminosity function of pulsars in M31. They also show that, unless the pulsar population in M31 is much dimmer than in our Galaxy, there is no need to invoke any violation of the inverse square law of the distance for pulsar fluxes.