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:
The Astrophysical Journal
影响因子:
--
通讯作者:
Anderson G
Anderson G
中科院分区:
--
文献类型:
--
作者:
Anderson G

文献摘要

参考文献

被引文献

相似文献

我们目前的X射线,红外线,光学和无线电观测的四个以前未确认的银河系平面X射线源:AX J163252-4746,AX J184738-0156,AX J144701-5919和AX J144547-5931。钱德拉X射线天文台对每个源的探测提供了亚弧秒的定位,我们用它来识别所有四个物体的明亮红外对应物。红外光谱和光学光谱显示,这四个X射线源都是质量极大的恒星,光谱分类为:Ofpe/WN 9(AX J163252-4746)、WN 7(AX J184738-0156= WR 121 a)、WN 7 -8h(AX J144701-5919)和OIf+(AX J144547-5931)。AX J163252-4746和AX J184738-0156都是发光的硬X射线发射体,在它们的X射线光谱中在6.7keV处具有强Fe xxv发射线。AX J163252-4746和AX J184738-0156的多波长性质与孤立的大质量恒星或吸积到紧凑的伴星上不一致;我们得出结论,它们的X射线辐射最有可能产生于碰撞风双星(CWB)系统。对于AX J144701-5919和AX J144547-5931,X射线发射的亮度要低一个数量级,光谱也更柔和。这些性质与CWB对这两种来源的解释也是一致的,但不能排除产生X射线的其他机制。在银道面还有许多其他尚未确认的X射线源,其X射线性质类似于AX J163252-4746、AX J184738-0156、AX J144701-5919和AX J144547-5931。这可能表明银河系中有大量的X射线发射大质量恒星和CWB。
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.
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
沃尔夫-拉叶双星的伽马射线发射
DOI: --
发表时间: 2002
期刊:
影响因子: --
作者:
P. Benaglia;G. Romero
通讯作者: G. Romero
大质量恒星碰撞风产生的非热高能辐射
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
雷丁大学/爱丁堡大学/利兹大学(英国)
DOI: --
发表时间: --
期刊:
影响因子: --
作者:
通讯作者: --