ROSAT OBSERVATIONS OF 9 GLOBULAR-CLUSTERS

被引：16

作者：

RAPPAPORT, S

DEWEY, D

LEVINE, A

MACRI, L

机构：

[1] MIT,CTR SPACE RES,CAMBRIDGE,MA 02139

[2] MIT,CTR SPACE RES,CAMBRIDGE,MA 02139

来源：

ASTROPHYSICAL JOURNAL | 1994年 / 423卷 / 02期

关键词：

BINARIES; GENERAL; GLOBULAR CLUSTERS; X-RAYS;

D O I：

10.1086/173841

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The ROSAT HRI was used to image fields around nine Galactic globular clusters that ave central densities in the range of 10(4)-10(5) M. pc-3 and that had not previously been observed with the Einstein Observatory. We detected X-ray sources associated with Pal 2 and NGC 6304 with luminosities of 1.1 X 10(34) ergs s-1 and 1.2 x 10(33) ergs s-1, respectively. No X-ray emission was detected from the source in Ter 6, thus confirming its transient nature. In all, there were 23 serendipitous sources found in the nine fields; none was apparently associated with any of the other seven clusters. The results are discussed in the context of low-luminosity cluster X-ray sources, in general.

引用

页码：633 / 639

页数：7

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[21] DETERMINATION OF CONFIDENCE-LIMITS FOR EXPERIMENTS WITH LOW NUMBERS OF COUNTS [J].