论文标题
洛法（Lofar
The LOFAR Tied-Array All-Sky Survey: Timing of 21 pulsars including the first binary pulsar discovered with LOFAR
论文作者
论文摘要
我们报告了Lofar绑定的All-Sky Allsky（Lotaas）中发现的21个脉冲星的多频计时观察结果。定时数据以149 MHz（Lofar）以及334和1532 MHz（Lovell Telecope）的中心频率获取。脉冲星的样品包括20个孤立的脉冲星和调查发现的第一个二进制脉冲星PSR J1658 $+$ 3630。我们对脉冲星的时序特性进行了建模，这表明它们平均具有较大的特征年龄。我们介绍了在三个观测带中脉冲星的脉冲曲线，其中PSR J1643 $+$ 1338显示了曲线进化，这似乎不是由半径到频率映射模型很好地描述。此外，我们使用简单的功率定律对脉冲星的光谱进行了建模，并发现平均光谱指数为$ -1.9 \ pm 0.5 $。在此处研究的脉冲星中，PSR J1657 $+$ 3304显示出大量的磁通密度变化在300天内的频率变化为10倍，并且在几分钟的时间尺度上更改和无效。我们对PSR J1658 $+$ 3630的旋转和轨道特性进行了建模，在二进制轨道的33毫秒33毫秒的旋转时间为3.0天，最小质量为0.87 $ m _ {\ odot} $，可能是碳氧气或氧气氧气或氧气neon-neon-neon-neon-neon-magnesium type WhiteDwarf。 PSR J1658 $+$ 3630具有3.0 PC CM $^{ - 3} $的分散度度量，使其可能是最接近的二进制脉冲星之一。
We report on the multi-frequency timing observations of 21 pulsars discovered in the LOFAR Tied-Array All-Sky Survey (LOTAAS). The timing data were taken at central frequencies of 149 MHz (LOFAR) as well as 334 and 1532 MHz (Lovell Telecope). The sample of pulsars includes 20 isolated pulsars and the first binary pulsar discovered by the survey, PSR J1658$+$3630. We modelled the timing properties of the pulsars, which showed that they have, on average, larger characteristic ages. We present the pulse profiles of the pulsars across the three observing bands, where PSR J1643$+$1338 showed profile evolution that appears not to be well-described by the radius-to-frequency-mapping model. Furthermore, we modelled the spectra of the pulsars across the same observing bands, using a simple power law, and found an average spectral index of $-1.9 \pm 0.5$. Amongst the pulsars studied here, PSR J1657$+$3304 showed large flux density variations of a factor of 10 over 300 days, as well as mode changing and nulling on timescales of a few minutes. We modelled the rotational and orbital properties of PSR J1658$+$3630, which has a spin period of 33 ms in a binary orbit of 3.0 days with a companion of minimum mass of 0.87$M_{\odot}$, likely a Carbon-Oxygen or Oxygen-Neon-Magnesium type white dwarf. PSR J1658$+$3630 has a dispersion measure of 3.0 pc cm$^{-3}$, making it possibly one of the closest binary pulsars known.
