Another thread in the tapestry of stellar feedback: X-ray binaries

	Another thread in the tapestry of stellar feedback: X-ray binaries
	Justham, Stephen1,2 ; Schawinski, Kevin 3,4
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2012-06-01
卷号	423 期号:2 页码:1641-1651
关键词	binaries: general galaxies: evolution X-rays: binaries
英文摘要	We consider X-ray binaries (XBs) as potential sources of stellar feedback. XBs observationally appear able to deposit a high fraction of their power output into their local interstellar medium, which may make them a non-negligible source of energy input. The formation rate of the most luminous XBs rises with decreasing metallicity, which should increase their significance during galaxy formation in the early Universe. We also argue that stochastic effects are important to XB feedback (XBF) and may dominate the systematic changes due to metallicity in many cases. Large stochastic variation in the magnitude of XBF at low absolute star formation rates provides a natural reason for diversity in the evolution of dwarf galaxies which were initially almost identical, with several per cent of such haloes experiencing energy input from XBs roughly two orders of magnitude above the most likely value. These probability distributions suggest that the effect of XBF is most commonly significant for total stellar masses between approximately 107 and 108 M?, which might resolve a current problem with modelling populations of such galaxies. We explain how XBs might inject energy before luminous supernovae (SNe) contribute significantly to feedback and how XBs can assist in keeping gas hot long after the last core-collapse SN has exploded. Energy input from XBs produces different behaviour to that from SNe, partly since the peak energy input from a mean XB population continues for similar to 100 Myr after the start of a starburst. XBF could be especially important to some dwarf galaxies, potentially heating gas without expelling it; the properties of XBF also match those previously derived as allowing episodic star formation. We also argue that the efficiency of SN feedback (SNF) might be reduced when XBF has had the opportunity to act first. In addition, we note that the effect of SNF is unlikely to be scale-free; galaxies smaller than similar to 100 pc might well experience less effective SNF.
收录类别	SCI
语种	英语
WOS记录号	WOS:000305070900051
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6255]
专题	国家天文台_光学天文研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 3.Yale Univ, Dept Phys, New Haven, CT 06520 USA 4.Yale Univ, Yale Ctr Astron & Astrophys, New Haven, CT 06520 USA
推荐引用方式 GB/T 7714	Justham, Stephen,Schawinski, Kevin. Another thread in the tapestry of stellar feedback: X-ray binaries[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,423(2):1641-1651.
APA	Justham, Stephen,&Schawinski, Kevin.(2012).Another thread in the tapestry of stellar feedback: X-ray binaries.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,423(2),1641-1651.
MLA	Justham, Stephen,et al."Another thread in the tapestry of stellar feedback: X-ray binaries".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 423.2(2012):1641-1651.