THE GMRT HIGH RESOLUTION SOUTHERN SKY SURVEY FOR PULSARS AND TRANSIENTS. I. SURVEY DESCRIPTION AND INITIAL DISCOVERIES
THE GMRT HIGH RESOLUTION SOUTHERN SKY SURVEY FOR PULSARS AND TRANSIENTS. I. SURVEY DESCRIPTION AND INITIAL DISCOVERIES
复制标题
DOI：
10.3847/0004-637x/817/2/130
复制
发表时间：
2015-09
期刊：
影响因子：
--
通讯作者：
B. Bhattacharyya;S. Cooper;M. Malenta;J. Roy;J. Chengalur;M. Keith;S. Kudale;M. Mclaughlin;
中科院分区：
文献类型：
--
作者：
B. Bhattacharyya;S. Cooper;M. Malenta;J. Roy;J. Chengalur;M. Keith;S. Kudale;M. Mclaughlin;
我们正在使用巨型米波射电望远镜(GMRT)对脉冲星和瞬变进行调查。GMRT高分辨率南方天文观测是一项在322兆赫兹赤纬范围内−40°至−54°的银河系外平面观测。在高时间分辨率(高达30.72μS)和高频率分辨率(高达0.016275兆赫)的观测模式下，对于一颗占空比为10%的脉冲星，5σ探测下限为0.5mJy。GHRSS的总天空覆盖率为2866°2，将由1953个点产生，每个点覆盖1.8°2。对于全球资源卫星系统调查，5毫秒瞬变猝发的10σ探测下限为1.6Jy。此外，GHRSS的调查还可以揭示瞬变事件，如旋转的射电瞬变或快速射电爆发。随着35%的调查完成(即1000°2)，我们报告发现了10颗脉冲星，其中1颗是毫秒脉冲星(MSP)，这是所有银河系外平面调查中每平方度最高的脉冲星发现率之一。我们重新探测到了23颗已知的束内脉冲星。利用GMRT的成像能力，我们还将4颗GHRSS脉冲星(包括MSP)在门控图像平面内定位在±10“范围内。我们展示了脉冲星计时的快速会聚，其位置比单碟子的发现更精确。我们还表明，我们可以用同时获得的较低时间分辨率的成像数据来定位最亮的瞬变源，展示了一种可能在平方公里阵列中应用的技术。
We are conducting a survey for pulsars and transients using the Giant Metrewave Radio Telescope (GMRT). The GMRT High Resolution Southern Sky (GHRSS) survey is an off-Galactic plane ( ∣ b ∣ ?> > 5) survey in the declination range −40° to −54° at 322 MHz. With the high time (up to 30.72 μs) and frequency (up to 0.016275 MHz) resolution observing modes, the 5σ detection limit is 0.5 mJy for a 2 ms pulsar with a 10% duty cycle at 322 MHz. The total GHRSS sky coverage of 2866 deg2 will result from 1953 pointings, each covering 1.8 deg2. The 10σ detection limit for a 5 ms transient burst is 1.6 Jy for the GHRSS survey. In addition, the GHRSS survey can reveal transient events like rotating radio transients or fast radio bursts. With 35% of the survey completed (i.e., 1000 deg2), we report the discovery of 10 pulsars, 1 of which is a millisecond pulsar (MSP), which is among the highest pulsar per square degree discovery rates for any off-Galactic plane survey. We re-detected 23 known in-beam pulsars. Utilizing the imaging capability of the GMRT, we also localized four of the GHRSS pulsars (including the MSP) in the gated image plane within ±10″. We demonstrated rapid convergence in pulsar timing with a more precise position than is possible with single-dish discoveries. We also show that we can localize the brightest transient sources with simultaneously obtained lower time resolution imaging data, demonstrating a technique that may have application in the Square Kilometre Array.