M33中脉冲星和瞬变源的Arecibo搜索
An Arecibo Search for Pulsars and Transient Sources in M33
摘要：
我们报告了一个系统的和敏感的搜索在附近的螺旋星系M33，在1.4 GHz的阿雷西博望远镜的七光束接收系统，ALFA进行的恒星和瞬态源。对周期源和非周期源的数据进行了搜索，离散度高达1000 pc cm^{-3}，时间尺度从$\sim$ 50 \us到几秒。该星系进行了采样与12 ALFA点，或84个像素的总数，其中每一个被搜索了2-3 hr. We描述的意见，搜索方法和分析策略适用于多波束系统，并评论的数据质量和统计的虚假事件，由于射频干扰。虽然这些搜索并没有导致任何结论性的信号周期性或瞬态性质，起源于银河系，他们说明了一些潜在的挑战和困难，在这种搜索和效率的同时多束搜索输出的分析。对于占空比为$\la$ 5%的M33周期源，其亮度（在1400 MHz时）的隐含极限为$\la$ 5 μ Jy Mpc ^2。对于短持续时间的瞬态信号（脉冲宽度为$\la$ 100 \us），极限峰值通量密度为100 mJy，如果位于M33的距离处，这将对应于从蟹状星云探测到的亮巨脉冲（$\sim$ 20 kJy）的5- $σ$。我们讨论了我们的零结果对星系内各种源种群的影响，并评论了未来的前景，即将到来的下一代仪器，包括平方公里阵列及其探路者进行更敏感的搜索。
英文摘要：
We report on a systematic and sensitive search for pulsars and transient sources in the nearby spiral galaxy M33, conducted at 1.4 GHz with the Arecibo telescope's seven-beam receiver system, ALFA. Data were searched for both periodic and aperiodic sources, up to 1000 pc cm^{-3} in dispersion measure and on timescales from $\sim$50 \us to several seconds. The galaxy was sampled with 12 ALFA pointings, or 84 pixels in total, each of which was searched for 2-3 hr. We describe the observations, search methodologies and analysis strategies applicable to multibeam systems, and comment on the data quality and statistics of spurious events that arise due to radio frequency interference. While these searches have not led to any conclusive signals of periodic or transient nature that originate in the galaxy, they illustrate some of the underlying challenges and difficulties in such searches and the efficacy of simultaneous multiple beams in the analysis of search output. The implied limits are $\la$5 uJy Mpc^2 in luminosity (at 1400 MHz) for periodic sources in M33 with duty cycles $\la$5%. For short-duration transient signals (with pulse widths $\la$100 \us), the limiting peak flux density is 100 mJy, which would correspond to a 5-$σ$ detection of bright giant pulses ($\sim$20 kJy) from Crab-like pulsars if located at the distance of M33. We discuss the implications of our null results for various source populations within the galaxy and comment on the future prospects to conduct even more sensitive searches with the upcoming next-generation instruments including the Square Kilometer Array and its pathfinders.
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