论文标题
ALMA对PSR B1259-63/LS 2883在不活动时期的观察结果：可变的偶尔磁盘？
ALMA Observations of PSR B1259-63/LS 2883 in an Inactive Period: Variable Circumstellar Disk?
论文作者
论文摘要
我们报告了Atacama大毫米/亚毫米阵列（ALMA）对伽马射线二进制系统的观察结果，其中包含PULSAR PSR PSR B1259-63在2017年至2021年Periastron通道之间的巨大恒星LS 2883中绕着大型恒星LS 2883绕。我们检测到97 GHz（频段3）和343 GHz（频段7）的二元系统的无线电连续发射。与我们以前的ALMA观察结果相比，在2017年Periastron通道后不久进行的观察结果相比，在97 GHz时的通量减少了6倍，而在343 GHz时则减少了两倍。相对于97 GHz时的通量相对于97 GHz的磁通量很大，并且似乎是LS 2883围绕磁盘的热发射。343GHz通量的减小可能表明磁盘已经扩展并部分呈薄片，因为该磁盘不再受脉冲风的影响。 97 GHz处的通量与脉冲星的脉冲发射的预期相一致，这表明通过脉冲星或脉冲星 - - - - - - - - - - - - - - - - - - - - - - - 摩尔风相互作用产生的脉冲发射消失了。系统的图像与点源一致，并且没有弹射的迹象。
We report Atacama Large Millimeter/submillimeter Array (ALMA) observations of the gamma-ray binary system containing the pulsar PSR B1259-63 orbiting around a massive star LS 2883 in an inactive period between the 2017 and 2021 periastron passages. We detected radio continuum emission from the binary system at 97 GHz (Band 3) and 343 GHz (Band 7). Compared with our previous ALMA observations performed soon after the 2017 periastron passage, the fluxes have decreased by an factor of six at 97 GHz and two at 343 GHz. The flux at 343 GHz is large relative to that at 97 GHz and appears to be thermal emission from the circumstellar disk around LS 2883. The decrease of the 343 GHz flux may indicate that the disk has expanded and become partially optically-thin since the disk is no longer affected by pulsar winds. The flux at 97 GHz is consistent with that expected from the pulsed emission from the pulsar, which indicates that the unpulsed emission that had been produced through pulsar-disk or pulsar-stellar wind interaction has disappeared. The image of the system is consistent with a point source and shows no sign of ejecta.
