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arXiv 1007.3271astro-ph.GA
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Arp ~(147)发光X射线源

Luminous X-Ray Sources in Arp 147

S. Rappaport, A. Levine, D. Pooley, B. Steinhorn

摘要:

钱德拉X射线天文台被用来拍摄碰撞环星系Arp 147的42 kS图像。我们探测到9个X射线源,其亮度在1.4 - 7 x 10^{39}尔格/秒的范围内,位于或靠近与环相关的恒星形成的蓝结。在入侵星系的核区探测到一个各向同性X射线亮度为1.4 x 10^{40}尔格/秒的源。与前景恒星和背景类星体相关联的X射线源用于改善X射线图像相对于HST高分辨率光学图像的配准。入侵星系在碰撞前显然含有少量气体,除了核球中的一个可能是一个供给不足的超大质量黑洞外,没有任何X射线源。这些观测结果证实了传统的观点,即富含气体的星系碰撞会引发大量的恒星形成,而恒星形成又会产生大量的X射线源,其中一些源的亮度超过了恒星质量吸积的爱丁顿极限

英文摘要:

The Chandra X-Ray Observatory was used to image the collisional ring galaxy Arp 147 for 42 ks. We detect 9 X-ray sources with luminosities in the range of 1.4 - 7 x 10^{39} ergs/sec in or near the blue knots of star formation associated with the ring. A source with an isotropic X-ray luminosity of 1.4 x 10^{40} ergs/sec is detected in the nuclear region of the intruder galaxy. X-ray sources associated with a foreground star and a background quasar are used to improve the registration of the X-ray image with respect to HST high resolution optical images. The intruder galaxy, which apparently contained little gas before the collision, shows no X-ray sources other than the one in the nuclear bulge which may be a poorly fed supermassive black hole. These observations confirm the conventional wisdom that collisions of gas rich galaxies trigger large rates of star formation which, in turn, generate substantial numbers of X-ray sources, some of which have luminosities above the Eddington limit for accreting stellar-mass

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