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arXiv 0803.1984astro-ph
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矮星系中存在超铝X射线源吗?

Do Ultraluminous X-Ray Sources Exist in Dwarf Galaxies?

Douglas A. Swartz, Roberto Soria, Allyn F. Tennant

摘要:

对局部体积内的超铝X射线源候选者进行彻底搜索。该搜索在空间上将X射线图像中检测到的或文献中编目的潜在ULX与Karachentsev等人(2004)编制的相邻星系表中列出的星系相匹配。特定的ULX频率(每单位星系质量的发生率)被发现是一个主机星系质量的递减函数以上的主机质量$\sim10^{8.5}$太阳质量。在这一点以下的星系质量太少,无法确定这种趋势是否会继续降低星系质量。在低质量星系中还没有发现ULX。矮星系和巨星系之间的系统差异,可以解释丰富的ULXs在矮星系和它们可能意味着什么ULXs的性质进行了讨论。

英文摘要:

A thorough search for Ultraluminous X-ray source candidates within the Local Volume is made. The search spatially matches potential ULXs detected in X-ray images or cataloged in the literature with galaxies tabulated in the Catalog of Neighboring Galaxies compiled by Karachentsev et al. (2004). The specific ULX frequency (occurrence rate per unit galaxy mass) is found to be a decreasing function of host galaxy mass for host masses above $\sim10^{8.5}$ solar mass. There is too little mass in galaxies below this point to determine if this trend continues to lower galaxy mass. No ULXs have yet been detected in lower-mass galaxies. Systematic differences between dwarf and giant galaxies that may explain an abundance of ULXs in dwarf galaxies and what they may imply about the nature of ULXs are discussed.

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