4XMM J182531.5-144036: A new persistent Be/X-ray binary found within the XMM-Newton serendipitous survey
arxiv(2024)
摘要
We aim to investigate the nature of time-variable X-ray sources detected in
the XMM-Newton serendipitous survey. The X-ray light curves of objects in
the XMM-Newton serendipitous survey were searched for variability and
coincident serendipitous sources observed by Chandra were also
investigated. Subsequent infrared spectroscopy of the counterparts to the X-ray
objects that were identified using UKIDSS was carried out using ISAAC on
the VLT. We found that the object 4XMM J182531.5–144036 detected in the XMM-Newton serendipitous survey in April 2008 was also detected by Chandra as CXOU J182531.4–144036 in July 2004. Both observations reveal a
hard X-ray source displaying a coherent X-ray pulsation at a period of 781 s.
The source position is coincident with a K=14 mag infrared object whose
spectrum exhibits strong HeI and Brγ emission lines and an infrared
excess above that of early B-type dwarf or giant stars. We conclude that
4XMM J182531.5–144036 is a Be/X-ray binary pulsar exhibiting persistent X-ray
emission and is likely in a long period, low eccentricity orbit, similar to X
Per.
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