论文标题
NGC 6440中脉冲星的发现和时机
Discoveries and Timing of Pulsars in NGC 6440
论文作者
论文摘要
使用Meerkat射电望远镜，已经进行了一系列观察到已知的脉冲星，并在球状群集NGC 6440中寻找新的脉冲星。结果，已经发现了两个脉冲星，NGC 6440G和NGC 6440H，其中一个是隔离的，另一个是隔离的（均为均为ablibs a ablet abled ables）。非常低的质量伴侣（m $ _ {\ rm c} $> 0.006 m $ _ {\ odot} $）。它加入了到目前为止在此集群中发现的其他二进制脉冲星，所有二进制脉冲星都具有低伴侣群体（m $ _ {\ rm c} $ <0.30 m $ $ _ {\ odot} $）。我们介绍了使用这两个新的脉冲星的绿色银行和Meerkat望远镜的数据获得的长期定时解决方案的结果，以及对Pulsars NGC 6440C和NGC 6440D的分析。对于孤立的Pulsar NGC 6440C，我们使用Markov Chain Monte Carlo技术搜索了行星。我们找到了明显未建模变化的证据，但不能很好地建模为行星，也不能作为幂律红噪声过程的一部分。对两个不同频段的“雷德”脉冲星NGC 6440D的蚀的研究表明，在较低频率（962-1283 MHz）的频率依赖性较长和不对称的叶标。
Using the MeerKAT radio telescope, a series of observations have been conducted to time the known pulsars and search for new pulsars in the globular cluster NGC 6440. As a result, two pulsars have been discovered, NGC 6440G and NGC 6440H, one of which is isolated and the other a non-eclipsing (at frequencies above 962 MHz) "Black Widow", with a very low mass companion (M$_{\rm c}$ > 0.006 M$_{\odot}$). It joins the other binary pulsars discovered so far in this cluster which all have low companion masses (M$_{\rm c}$ < 0.30 M$_{\odot}$). We present the results of long-term timing solutions obtained using data from both Green Bank and MeerKAT telescopes for these two new pulsars and an analysis of the pulsars NGC 6440C and NGC 6440D. For the isolated pulsar NGC 6440C, we searched for planets using a Markov Chain Monte Carlo technique. We find evidence for significant unmodelled variations but they cannot be well modelled as planets nor as part of a power-law red-noise process. Studies of the eclipses of the "Redback" pulsar NGC 6440D at two different frequency bands reveal a frequency dependence with longer and asymmetric eclipses at lower frequencies (962-1283 MHz).
