Hard X-ray emission from a young massive star-forming cluster

被引:10
作者
Beuther, H
Kerp, J
Preibisch, T
Stanke, T
Schilke, P
机构
[1] Max Planck Inst Radioastron, D-53121 Bonn, Germany
[2] Univ Bonn, Inst Radioastron, D-53121 Bonn, Germany
关键词
accretion; accretion disks; stars : early type; stars : formation; ISM; dust; extinction; radiation mechanisms : thermal;
D O I
10.1051/0004-6361:20021261
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report the detection of hard X-ray emission (>2 keV) from a number of point sources associated with the very young massive star-forming region IRAS 19410 + 2336. The X-ray emission is detected from several sources located around the central and most deeply embedded mm continuum source, which remains undetected in the X-ray regime. All X-ray sources have K-band counterparts, and those likely belonging to the evolving massive cluster show near-infrared colors in the 2MASS data indicative of pre-main-sequence stages. The X-ray luminosities around 10(31) erg s(-1) are at the upper end of luminosities known for low-mass pre-main-sequence sources, and mass estimates based on the infrared data indicate that at least some of the X-ray detected sources are intermediate-mass objects. Therefore, we conclude that the X-ray emission is due to intermediate-mass pre-main-sequence Herbig Ae/Be stars or their precursors. The emission process is possibly due to magnetic star-disk interaction as proposed for their low-mass counterparts.
引用
收藏
页码:169 / 177
页数:9
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