Study of 72 Pulsars Discovered in the PALFA Survey: Timing Analysis, Glitch Activity, Emission Variability, and a Pulsar in an Eccentric Binary
Study of 72 Pulsars Discovered in the PALFA Survey: Timing Analysis, Glitch Activity, Emission Variability, and a Pulsar in an Eccentric Binary
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DOI：
10.3847/1538-4357/ac375d
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发表时间：
2021-08
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通讯作者：
E. Parent;H. Sewalls;P. Freire;T. Matheny;A. Lyne;B. Perera;F. Cardoso;M. Mclaughlin;B. Allen;A. Brazier;F. Camilo;S. Chatterjee;J. Cordes;F. Crawford;J. Deneva;F. Dong;R. Ferdman;E. Fonseca;J. Hessels;V. Kaspi;B. Knispel;J. van Leeuwen;R. Lynch;B. M. Meyers;J. McKee;M. Mickaliger;C. Patel;S. Ransom;A. Rochon;P. Scholz;I. Stairs;B. Stappers;C. Tan;W. Zhu
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作者：
E. Parent;H. Sewalls;P. Freire;T. Matheny;A. Lyne;B. Perera;F. Cardoso;M. Mclaughlin;B. Allen;A. Brazier;F. Camilo;S. Chatterjee;J. Cordes;F. Crawford;J. Deneva;F. Dong;R. Ferdman;E. Fonseca;J. Hessels;V. Kaspi;B. Knispel;J. van Leeuwen;R. Lynch;B. M. Meyers;J. McKee;M. Mickaliger;C. Patel;S. Ransom;A. Rochon;P. Scholz;I. Stairs;B. Stappers;C. Tan;W. Zhu
我们展示了对脉冲星阿雷西博 L 波段馈源阵列 (PALFA) 巡天中发现的 72 颗脉冲星进行长期计时的新发现和结果，包括精确确定天体测量和自旋参数，以及 1.4 GHz 下的通量密度和散射展宽测量。值得注意的发现包括两颗没有明显超新星遗迹关联的年轻脉冲星（特征年龄~30 kyr）、三颗模态改变脉冲星、12 颗零脉冲星和两颗间歇脉冲星。我们在五颗脉冲星中检测到八个故障。其中包括PSR J1939+2609，一颗明显古老的脉冲星（特征年龄~1 Gy），以及PSR J1954+2529，它可能属于新出现的一类双星脉冲星。后者是这 72 颗脉冲星中唯一一颗明显不是孤立的：一颗自转周期为 931 毫秒的非回收中子星，位于偏心 (e = 0.114) 宽 (P b = 82.7 天) 轨道上，其伴星性质不明，最小质量为 ∼0.6 M ⊙。自阿雷西博于 2020 年 8 月停止运营以来，我们对 PALFA 天空覆盖范围进行了最终统计，并将其发现的 207 颗脉冲星与已知数量进行了比较。平均而言，它们比其他银河平面射电脉冲星距离远 50%； PALFA 毫秒脉冲星 (MSP) 每单位自转周期的色散测量值是平面上已知 MSP 数量的两倍。 PALFA 发现的四颗间歇性脉冲星使此类天体的数量增加了一倍以上，这应该有助于提高我们对脉冲星磁层物理的理解。这些物体、旋转射电瞬变和归零脉冲星的统计数据表明，银河系中这些物体的数量比之前想象的要多得多。
We present new discoveries and results from long-term timing of 72 pulsars discovered in the Pulsar Arecibo L-band Feed Array (PALFA) survey, including precise determination of astrometric and spin parameters, and flux density and scatter broadening measurements at 1.4 GHz. Notable discoveries include two young pulsars (characteristic ages ∼30 kyr) with no apparent supernova remnant associations, three mode-changing, 12 nulling and two intermittent pulsars. We detected eight glitches in five pulsars. Among them is PSR J1939+2609, an apparently old pulsar (characteristic age ∼1 Gy), and PSR J1954+2529, which likely belongs to a newly emerging class of binary pulsars. The latter is the only pulsar among the 72 that is clearly not isolated: a nonrecycled neutron star with a 931 ms spin period in an eccentric (e = 0.114) wide (P b = 82.7 days) orbit with a companion of undetermined nature having a minimum mass of ∼0.6 M ⊙. Since operations at Arecibo ceased in 2020 August, we give a final tally of PALFA sky coverage, and compare its 207 pulsar discoveries to the known population. On average, they are 50% more distant than other Galactic plane radio pulsars; PALFA millisecond pulsars (MSPs) have twice the dispersion measure per unit spin period than the known population of MSP in the plane. The four intermittent pulsars discovered by PALFA more than double the population of such objects, which should help to improve our understanding of pulsar magnetosphere physics. The statistics for these, rotating radio transients, and nulling pulsars suggest that there are many more of these objects in the Galaxy than was previously thought.