arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1603.01151astro-ph.HEastro-ph.IMastro-ph.SR
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Arecibo 327 MHz漂移脉冲星巡天射电瞬态搜索的新发现

New Discoveries from the Arecibo 327 MHz Drift Pulsar Survey Radio Transient Search

J. S. Deneva, K. Stovall, M. A. McLaughlin, M. Bagchi, S. D. Bates, P. C. C. Freire, J. G. Martinez, F. Jenet, N. Garver-Daniels

摘要:

我们提出了一个新的算法,用于识别分散的天体物理脉冲的martterrank。这样的脉冲通常从银河系恒星和旋转射电瞬变(RRAT)中检测到,它们是具有零星射电发射的中子星。最近,被称为快速射电暴(FRB)的孤立的、高度分散的脉冲已被确定为河外激变射电源的潜在特征,与射电星和RRAT不同。Arecterrank帮助我们在Arecibo 327 MHz漂移脉冲星巡天(AO327)的数据中发现了14颗Arecibo和8颗RRAT。新的RRAT具有范围为$23.5 - 86.6$ pc cm $^{-3}$的DM和范围为$0.172 - 3.901$ s的周期。新的调制器具有范围$23.6 - 133.3$ pc cm $^{-3}$中的DM和范围$1.249 - 5.012$ s中的周期,并且包括两个零器和一个模式切换对象。我们估计的全天空FRB率$10^5$天$^{-1}$的爆发宽度为10毫秒和流量密度$\gtrsim 83$毫焦耳的上限。所有新发现的DM都与银河系起源一致。在比较新的RRAT的统计数据与来自RRAT的来源时,我们发现这两组数据都来自同一时期的分布。与此相反,我们发现,新的恒星的周期分布是不同的周期分布的规范恒星的ATNF目录或AO327数据中发现的恒星的周期搜索。这表明集群排名是周期性搜索的有力补充,并发现了迄今为止在调查结果中代表性不足的脉冲星种群子集,因此在银河系脉冲星种群模型中也是如此。

英文摘要:

We present Clusterrank, a new algorithm for identifying dispersed astrophysical pulses. Such pulses are commonly detected from Galactic pulsars and rotating radio transients (RRATs), which are neutron stars with sporadic radio emission. More recently, isolated, highly dispersed pulses dubbed fast radio bursts (FRBs) have been identified as the potential signature of an extragalactic cataclysmic radio source distinct from pulsars and RRATs. Clusterrank helped us discover 14 pulsars and 8 RRATs in data from the Arecibo 327 MHz Drift Pulsar Survey (AO327). The new RRATs have DMs in the range $23.5 - 86.6$ pc cm$^{-3}$ and periods in the range $0.172 - 3.901$ s. The new pulsars have DMs in the range $23.6 - 133.3$ pc cm$^{-3}$ and periods in the range $1.249 - 5.012$ s, and include two nullers and a mode-switching object. We estimate an upper limit on the all-sky FRB rate of $10^5$ day$^{-1}$ for bursts with a width of 10 ms and flux density $\gtrsim 83$ mJy. The DMs of all new discoveries are consistent with a Galactic origin. In comparing statistics of the new RRATs with sources from the RRATalog, we find that both sets are drawn from the same period distribution. In contrast, we find that the period distribution of the new pulsars is different from the period distributions of canonical pulsars in the ATNF catalog or pulsars found in AO327 data by a periodicity search. This indicates that Clusterrank is a powerful complement to periodicity searches and uncovers a subset of the pulsar population that has so far been underrepresented in survey results and therefore in Galactic pulsar population models.

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