标题： 对年轻脉冲星PSR J1906+0746的1.3 M$_{\odot}$ compact-object binary伴星的射电脉动深度搜索 显示英文标题

标题： A deep search for radio pulsations from the 1.3 M$_{\odot}$ compact-object binary companion of young pulsar PSR J1906+0746

摘要： 双脉冲星系统为天体物理学和基础物理学的研究提供了无与伦比的优势。 但只有一个可见：PSR J0737$-$3039；由于广义相对论的测地进动效应，其组成部分脉冲星B现在已经看不见了。 我们知道，这些进动周期也可以使脉冲星重新进入视线，且在PSR J1906+0746中这种进动强度类似。 该源是一个年轻的、未回收的射电脉冲星，围绕一个质量为$\sim $1.32 M$_{\odot}$的致密天体运行。 这项工作提出了一个新的探测计划，以在上一次搜索后的二十年内探测该伴星的射电脉冲。 推动这次重新尝试的两个关键原因是：伴星的射电束可能已经进动到我们的视线方向，以及现在FAST射电望远镜提供的灵敏度有所提高。 在28次深度观测中，我们没有检测到可信的伴星脉冲信号。 在比较了可能的情况后，我们得出结论，伴星很可能仍然是一个不朝向我们的脉冲星。 接下来，我们给出了这类系统在其进动周期中覆盖天空的估计。 我们发现，对于大多数系统几何结构，所有时间的束流分数为1，即任何方向的观测者都可以在某个时刻看到该系统。 我们得出结论，PSR J1906+0746未来仍很可能是双脉冲星。 显示英文摘要

摘要： Double pulsar systems offer unrivaled advantages for the study of both astrophysics and fundamental physics. But only one has been visible: PSR J0737$-$3039; and its component pulsar B has now rotated out of sight due to the general-relativistic effect of geodetic precession. We know, though, that these precession cycles can also pivot pulsars into sight, and that this precession occurs at similar strength in PSR J1906+0746. That source is a young, unrecycled radio pulsar, orbiting a compact object with mass $\sim $1.32 M$_{\odot}$. This work presents a renewed campaign to detect radio pulsations from this companion, two decades after the previous search. Two key reasons driving this reattempt are the possibility that the companion radio beam has since precessed into our line of sight, and the improved sensitivity now offered by the FAST radio telescope. In 28 deep observations, we did not detect a credible companion pulsar signal. After comparing the possible scenarios, we conclude the companion is still most likely a pulsar that is not pointing at us. We next present estimates for the sky covered by such systems throughout their precession cycle. We find that for most system geometries, the all-time beaming fraction is unity, i.e., observers in any direction can see the system at some point. We conclude it is still likely that PSR J1906+0746 will be visible as a double pulsar in the future.