FAST 19波束脉冲星漂移扫描巡天模拟
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摘要
脉冲星搜索是500 m口径球面射电望远镜(Five-hundred-meter Aperture Spherical Radio Telescope,FAST)的主要科学目标之一。针对FAST设备性能,模拟FAST脉冲星巡天,优化巡天方案,对即将开展的FAST脉冲星巡天项目具有重要的实用价值。基于Parkes多波束巡天、Parkes中纬度巡天和Parkes高纬度巡天的结果,利用脉冲星分布模拟软件包PsrPopPy,模拟得到了银河系中正常脉冲星和毫秒脉冲星的空间分布样本,并根据FAST设备参数进行了虚拟观测。结果表明,使用FAST 19波束接收机漂移扫描观测模式,在中心频率为1250MHz,带宽为400 MHz,每波束扫描时间为13.5 s,有效积分时间为6.0 s的情况下,在赤纬为-14~?12′～65~?48′天区内,可发现1600颗正常脉冲星和238颗毫秒脉冲星。为获得银河系中脉冲星自旋演化的样本,使用evolve代码进行了再次模拟。设置相同的观测参数的情况下,在全天范围内模拟探测到孤立正常脉冲星1749颗,并得到其在P-P图上的分布。
Pulsar search is one of the main scientific goals of Five-hundred-meter Aperture Spherical Telescope(FAST). It is very import for the actual FAST pulsar survey to simulate the pulsar survey by using the device parameters of FAST. Based on the datasets of the Parkes Multi-beam Pulsar Surveys, we simulate the spatial distributions of the millisecond and ordinary pulsars by using the software package Psr Pop Py. For those simulated pulsars in the sky region of-14~?12′ δ 65~?48′, we use the FAST 19-beam receiver to carry out virtual drift-scan observation at center frequency of 1250 MHz with the bandwidth of 400 MHz. We find that 1600 ordinary pulsars and 238 millisecond pulsars can be searched by FAST in the virtual drift-scan observation. To obtain the sample of the pulsar spin evolution,we simulate the distributions of pulsars in all sky of FAST under the same parameters with the evolve code. We obtain 1749 isolated normal pulsars and their distribution of P-P.
Pulsar search is one of the main scientific goals of Five-hundred-meter Aperture Spherical Telescope(FAST). It is very import for the actual FAST pulsar survey to simulate the pulsar survey by using the device parameters of FAST. Based on the datasets of the Parkes Multi-beam Pulsar Surveys, we simulate the spatial distributions of the millisecond and ordinary pulsars by using the software package Psr Pop Py. For those simulated pulsars in the sky region of-14~?12′ δ 65~?48′, we use the FAST 19-beam receiver to carry out virtual drift-scan observation at center frequency of 1250 MHz with the bandwidth of 400 MHz. We find that 1600 ordinary pulsars and 238 millisecond pulsars can be searched by FAST in the virtual drift-scan observation. To obtain the sample of the pulsar spin evolution,we simulate the distributions of pulsars in all sky of FAST under the same parameters with the evolve code. We obtain 1749 isolated normal pulsars and their distribution of P-P.
引文
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[4]Lorimer D R,Kramer M,M¨uller P,et al.A&A,2000,358:169
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[16]Li D,Pan Z.Radio Science,2016,51:1060
[17]Nan R D,Zhang H Y,Zhang Y,et al.Ch A&A,2017,41:293
[18]南仁东,张海燕,张莹,等.天文学报,2016,57:623
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[23]Pacini F.Nature,1968,219:145
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[25]Lyne A G,Lorimer D R.Nature,1994,369:127
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[35]Chen K,Ruderman M.Ap J,1993,402:264
[36]Zhang L,Hobbs G,Li D,et al.RAA,2016,16:10
[37]张蕾,张洁,李菂,等.天文学进展,2015,33:506
[38]http://psrpop.sourceforge.net,2016
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[40]https://github.com/samb8s/Psr Pop Py,2016
[41]Ridley J P,Lorimer D R.MNRAS,2010,404:1081
[42]Bhat N D R,Cordes J M,Camilo F,et al.Ap J,2004,605:759
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