X-ray sources and their optical counterparts in the globular cluster M 22

被引：22

作者：

Webb, NA

Serre, D

Gendre, B

Barret, D

Lasota, JP

Rizzi, L

机构：

[1] Ctr Etud Spatiale Rayonnements, F-31028 Toulouse 04, France

[2] Inst Astrophys, F-75014 Paris, France

[3] Osserv Astron Padova, INAF, I-35122 Padua, Italy

[4] CNR, Ist Astrofis Spaziale & Fis Cosm, Rome, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2004年 / 424卷 / 01期

关键词：

Galaxy : globular clusters : individual : M 22; X-rays : general; stars : binaries : general; galaxies : clusters : general;

D O I：

10.1051/0004-6361:20040399

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using XMM-Newton EPIC imaging data, we have detected 50 low-luminosity X-ray sources in the field of view of M 22, where 5+/-3 of these sources are likely to be related to the cluster. Using differential optical photometry, we have identified probable counterparts to those sources belonging to the cluster. Using X-ray spectroscopic and timing studies, supported by the optical colours, we propose that the most central X-ray sources in the cluster are cataclysmic variables, millisecond pulsars, active binaries and a blue straggler. We also identify a cluster of galaxies behind this globular cluster.

引用

页码：133 / 143

页数：11

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