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arXiv 1310.6364astro-ph.COastro-ph.HE
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扩展Chandra深场南的亚毫米波半导体ALMA观测:亚毫米波半导体的AGN分数和X射线性质

An ALMA Survey of Submillimeter Galaxies in the Extended Chandra Deep Field South: The AGN Fraction and X-ray Properties of Submillimeter Galaxies

S. X. Wang, W. N. Brandt, B. Luo, I. Smail, D. M. Alexander, A. L. R. Danielson, J. A. Hodge, A. Karim, B. D. Lehmer, J. M. Simpson, A. M. Swinbank, F. Walter, … 展开作者

S. X. Wang, W. N. Brandt, B. Luo, I. Smail, D. M. Alexander, A. L. R. Danielson, J. A. Hodge, A. Karim, B. D. Lehmer, J. M. Simpson, A. M. Swinbank, F. Walter, J. L. Wardlow, Y. Q. Xue, S. C. Chapman, K. E. K. Coppin, H. Dannerbauer, C. De Breuck, K. M. Menten, P. van der Werf

摘要:

亚毫米级星系(SMG)中巨大的气体和尘埃库可能为触发活动星系核(AGN)提供充足的燃料,但由于亚毫米级观测的不均匀性和有限的角分辨率,以往对SMG中活动星系核的研究一直存在争议。在这里,我们设置了改进的约束AGN的分数和X射线属性的SMG与ALMA和钱德拉观测在扩展的钱德拉深场南(E-CDF-S)。这项研究是同类研究中第一个明确识别SMG对应物的X射线的研究;这是使用完全亚毫米识别的、统计上可靠的SMG目录完成的,其中包括来自ALMA LABOCA E-CDF-S亚毫米调查(ALESS)的99个SMG。我们发现10个X射线源与SMG(中位红移z = 2.3),其中8个被确定为活动星系核使用几种技术,使交叉检查。另外两个X射线探测到的SMG的X射线发射水平可以用它们的恒星形成活动来解释。8个SMG-AGN中有6个是中强吸收的,N_H > 10 e ~(23)cm ~(-2)。考虑到X射线灵敏度的空间变化,对活动星系核的分析得出,静止坐标系0.5-8 keV吸收校正光度> 7.8x10 e42 erg s-1的活动星系核的活动星系核分数为17+16-6%;我们提供了活动星系核分数作为X射线通量和光度的函数的估计。ALMA的高角分辨率还首次实现了SMG精确位置的直接X射线叠加,在我们的叠加样品中发现了4个潜在的SMG-AGN。

英文摘要:

The large gas and dust reservoirs of submm galaxies (SMGs) could potentially provide ample fuel to trigger an Active Galactic Nucleus (AGN), but previous studies of the AGN fraction in SMGs have been controversial largely due to the inhomogeneity and limited angular resolution of the available submillimeter surveys. Here we set improved constraints on the AGN fraction and X-ray properties of the SMGs with ALMA and Chandra observations in the Extended Chandra Deep Field-South (E-CDF-S). This study is the first among similar works to have unambiguously identified the X-ray counterparts of SMGs; this is accomplished using the fully submm-identified, statistically reliable SMG catalog with 99 SMGs from the ALMA LABOCA E-CDF-S Submillimeter Survey (ALESS). We found 10 X-ray sources associated with SMGs (median redshift z = 2.3), of which 8 were identified as AGNs using several techniques that enable cross-checking. The other 2 X-ray detected SMGs have levels of X-ray emission that can be plausibly explained by their star-formation activity. 6 of the 8 SMG-AGNs are moderately/highly absorbed, with N_H > 10e23 cm-2. An analysis of the AGN fraction, taking into account the spatial variation of X-ray sensitivity, yields an AGN fraction of 17+16-6% for AGNs with rest-frame 0.5-8 keV absorption-corrected luminosity >7.8x10e42 erg s-1; we provide estimated AGN fractions as a function of X-ray flux and luminosity. ALMA's high angular resolution also enables direct X-ray stacking at the precise positions of SMGs for the first time, and we found 4 potential SMG-AGNs in our stacking sample.

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