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arXiv 0705.1278astro-ph
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Chandra深场南部X射线选星形成星系的多波长研究

Multiwavelength Study of X-ray Selected Star Forming Galaxies within the Chandra Deep Field South

Daniel Rosa-Gonzalez, Denis Burgarella, Kirpal Nandra, Daniel Kunth, Elena Terlevich, Roberto Terlevich

摘要:

我们结合了多波长观测选定的样本的恒星形成星系与星系演化模型,以比较不同的SFR示踪剂所获得的结果,并研究恒星形成区域的演化对它们的影响。我们还旨在获得更好的理解,由于消光和核活动的SFR推导的校正。我们选择的样品从钱德拉数据的研究区域钱德拉深场南(CDFS),并选择对象,也有紫外线和红外线数据GALEX和GOODS-Spitzer分别。我们的主要发现是消光校正的SFR(UV)和SFR(X)之间有很好的一致性,我们确认使用X射线光度作为一个可信的示踪剂的最近的恒星形成活动。然而,在SFR(UV)大于约5 Msol/年时,有几个星系的SFR(X)过量,这表明存在一个在光谱中没有检测到的模糊AGN。我们的结论是,即使在那些星系的SFR(X)是一个数量级高于SFR(UV),因此可能窝藏活动星系核的红外光度是由最近的恒星形成。一个天体显示的SFR(X)比基于SFR(UV)的预期值低得多;这种SFR(X)“不足”可能是由于在大部分大质量X射线双星形成之前的早期瞬态阶段。X射线缺陷可以用来在与大质量恒星有关的第一颗超新星爆炸之后和大质量X射线双星开始之前的早期阶段选择非常年轻的爆发。

英文摘要:

We have combined multi-wavelength observations of a selected sample of starforming galaxies with galaxy evolution models in order to compare the results obtained for different SFR tracers and to study the effect that the evolution of the starforming regions has on them. We also aimed at obtaining a better understanding of the corrections due to extinction and nuclear activity on the derivation of the SFR. We selected the sample from Chandra data for the well studied region Chandra Deep Field South (CDFS) and chose the objects that also have UV and IR data from GALEX and GOODS-Spitzer respectively. Our main finding is that there is good agreement between the extinction corrected SFR(UV) and the SFR(X), and we confirm the use of X-ray luminosities as a trustful tracer of recent star formation activity. Nevertheless, at SFR(UV) larger than about 5Msol/year there are several galaxies with an excess of SFR(X) suggesting the presence of an obscured AGN not detected in the optical spectra. We conclude that the IR luminosity is driven by recent star formation even in those galaxies where the SFR(X) is an order of magnitude higher than the SFR(UV) and therefore may harbour an AGN. One object shows SFR(X) much lower than expected based on the SFR(UV); this SFR(X) `deficit' may be due to an early transient phase before most of the massive X-ray binaries were formed. An X-ray deficit could be used to select extremely young bursts in an early phase just after the explosion of the first supernovae associated with massive stars and before the onset of massive X-ray binaries.

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