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arXiv 0909.5225astro-ph.HEastro-ph.CO
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首次用Spitzer探测超铝X射线源中的[O IV ] II。Holmberg II ULX中高亮度的证据

The First Detection of [O IV] from an Ultraluminous X-ray Source with Spitzer. II. Evidence for High Luminosity in Holmberg II ULX

C. T. Berghea, R. P. Dudik, K. A. Weaver, T. R Kallman

摘要:

这是两篇论文中的第二篇,研究了斯皮策红外光谱仪(IRS)对霍姆伯格II号超铝X射线源(ULX)的观测。在这里,我们进行详细的光电离建模的红外线。我们的分析表明,[O IV] 25.89 $μ$ m发射线的亮度和形态是由软X射线和远紫外线(FUV)辐射的双系统的吸积盘的光致电离和不一致的窄光束。我们表明,发射星云是物质的视线方向和东方的约束,并可能辐射约束到西方。需要超过10 $^{40}$ erg s $^{-1}$的热光度来产生测量的[O IV]通量。我们使用建模和以前发表的研究得出结论,冲击可能贡献很小,如果在所有,在Holmberg II ULX观察到的高电离线通量。此外,我们发现伴星的光谱类型对[O IV]发射的预测强度有着令人惊讶的强烈影响。这一发现可以解释某些含有黑洞双星的星暴系统中[O IV]的起源。

英文摘要:

This is the second of two papers examining Spitzer Infrared Spectrograph (IRS) observations of the ultraluminous X-ray source (ULX) in Holmberg II. Here we perform detailed photoionization modeling of the infrared lines. Our analysis suggests that the luminosity and morphology of the [O IV] 25.89 $μ$m emission line is consistent with photoionization by the soft X-ray and far ultraviolet (FUV) radiation from the accretion disk of the binary system and inconsistent with narrow beaming. We show that the emission nebula is matter-bounded both in the line of sight direction and to the east, and probably radiation-bounded to the west. A bolometric luminosity in excess of 10$^{40}$ erg s$^{-1}$ would be needed to produce the measured [O IV] flux. We use modeling and previously published studies to conclude that shocks likely contribute very little, if at all, to the high-ionization line fluxes observed in the Holmberg II ULX. Additionally, we find that the spectral type of the companion star has a surprisingly strong effect on the predicted strength of the [O IV] emission. This finding could explain the origin of [O IV] in some starburst systems containing black hole binaries.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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