IDENTIFICATION OF A POPULATION OF X-RAY-EMITTING MASSIVE STARS IN THE GALACTIC PLANE
IDENTIFICATION OF A POPULATION OF X-RAY-EMITTING MASSIVE STARS IN THE GALACTIC PLANE
复制标题
银河系平面上发射 X 射线的大质量恒星群的识别
DOI:
10.1088/0004-637x/727/2/105
复制
发表时间:
2011
期刊:
影响因子:
--
通讯作者:
Anderson G
中科院分区:
文献类型:
--
作者:
Anderson G
We present X-ray, infrared, optical, and radio observations of four previously unidentified Galactic plane X-ray sources: AX J163252–4746, AX J184738–0156, AX J144701–5919, and AX J144547–5931. Detection of each source with the Chandra X-ray Observatory has provided sub-arcsecond localizations, which we use to identify bright infrared counterparts to all four objects. Infrared and optical spectroscopy of these counterparts demonstrate that all four X-ray sources are extremely massive stars, with spectral classifications: Ofpe/WN9 (AX J163252–4746), WN7 (AX J184738–0156= WR121a), WN7–8h (AX J144701–5919), and OIf+(AX J144547–5931). AX J163252–4746 and AX J184738–0156 are both luminous, hard, X-ray emitters with strong Fe xxv emission lines in their X-ray spectra at∼ 6.7 keV. The multi-wavelength properties of AX J163252–4746 and AX J184738–0156 are not consistent with isolated massive stars or accretion onto a compact companion; we conclude that their X-ray emission is most likely generated in a colliding-wind binary (CWB) system. For both AX J144701–5919 and AX J144547–5931, the X-ray emission is an order of magnitude less luminous and with a softer spectrum. These properties are consistent with a CWB interpretation for these two sources also, but other mechanisms for the generation of X-rays cannot be excluded. There are many other as yet unidentified X-ray sources in the Galactic plane, with X-ray properties similar to those seen for AX J163252–4746, AX J184738–0156, AX J144701–5919, and AX J144547–5931. This may indicate a substantial population of X-ray-emitting massive stars and CWBs in the Milky Way.
登录
查看更多内容
DOI:
10.1073/pnas.0914464107
发表时间:
2010-04
期刊:
Proceedings of the National Academy of Sciences
影响因子:
--
作者:
D. Swartz;S. Wolk;A. Fruscione
通讯作者:
D. Swartz;S. Wolk;A. Fruscione
DOI:
--
发表时间:
1971
期刊:
影响因子:
--
作者:
N. Walborn
通讯作者:
N. Walborn
DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
P. Benaglia;G. Romero
通讯作者:
G. Romero
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
A. Reimer;A. Reimer;M. Pohl;O. Reimer
通讯作者:
O. Reimer
DOI:
--
发表时间:
--
期刊:
影响因子:
--
作者:
通讯作者:
--