4XMM J182531.5–144036: A new persistent Be/X-ray binary found within the XMM-Newton serendipitous survey

IF 4.5 3区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Publications of the Astronomical Society of Australia Pub Date : 2024-01-15 DOI:10.1017/pasa.2024.6

A.B. Mason, A.J Norton, J.S. Clark, S.A Farrell, A.J. Gosling

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引用次数: 0

Abstract

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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4XMM J182531.5-144036：在XMM-牛顿偶然巡天中发现的一个新的持久B/X射线双星

我们的目的是研究在 XMM-Newton 偶然巡天观测中探测到的时变 X 射线源的性质。我们对 XMM-Newton 偶然巡天观测中的天体的 X 射线光变曲线进行了搜索，并对钱德拉观测到的巧合偶然源进行了调查。随后利用 VLT 上的 ISAAC 对利用 UKIDSS 确定的 X 射线天体的对应天体进行了红外光谱分析。我们发现，2008 年 4 月在 XMM-Newton 偶然巡天中探测到的天体 4XMM J182531.5-144036 也是钱德拉在 2004 年 7 月探测到的 CXOU J182531.4-144036。我们的结论是，4XMM J182531.5-144036是一颗Be/X射线双脉冲星，表现出持续的X射线发射，很可能处于长周期、低偏心率轨道中，类似于X Per。

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来源期刊

Publications of the Astronomical Society of Australia 地学天文-天文与天体物理

CiteScore

5.90

自引率

9.50%

发文量

审稿时长

>12 weeks

期刊介绍： Publications of the Astronomical Society of Australia (PASA) publishes new and significant research in astronomy and astrophysics. PASA covers a wide range of topics within astronomy, including multi-wavelength observations, theoretical modelling, computational astronomy and visualisation. PASA also maintains its heritage of publishing results on southern hemisphere astronomy and on astronomy with Australian facilities. PASA publishes research papers, review papers and special series on topical issues, making use of expert international reviewers and an experienced Editorial Board. As an electronic-only journal, PASA publishes paper by paper, ensuring a rapid publication rate. There are no page charges. PASA''s Editorial Board approve a certain number of papers per year to be published Open Access without a publication fee.