X-ray detected AGN in SDSS dwarf galaxies

X-ray detected AGN in SDSS dwarf galaxies
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X射线在SDSS矮星系中检测到活动星系核

DOI:
10.1093/mnras/staa040
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发表时间:
2020
影响因子:
4.8
通讯作者:
Birchall K
Birchall K
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Birchall K

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在这项工作中,我们提出了局部(z≤0.25)矮星系()中x射线选择AGN的稳健量化()。我们定义了在MPA-JHU星系目录(基于SDSS DR8)和3XMM DR7的足迹内发现的4331个矮星系的母样本,对数据进行了仔细的审查,以消除错误的识别,并产生了61个矮星系的样本,这些样本显示出核x射线活动指示AGN。我们检查了我们的x射线选择样品的光学发射线比率,发现光学AGN诊断不能识别85%的源。然后,我们根据它们的特定吸积率(∝LX/M*, Eddington比率的近似示踪剂)计算了为AGN提供动力的黑洞的增长率。在我们观察到的样本中,我们发现了一个大范围的特定吸积速率。在校正了观测到的样品的3XMM的不同灵敏度后,我们发现了进一步的证据,证明x射线的光度和特定的吸积率范围很广,由幂律描述。使用这个修正的AGN样本,我们还定义了一个AGN分数来描述它们在母样本中的相对发生率。我们发现,对于x射线光度介于和之间的星系,AGN分数随着宿主星系质量的增加而增加(高达≈6%),并且通过将幂律外推到更高的光度,我们发现证据表明,发光AGN分数()在toz≈0.7之外是恒定的。
In this work we present a robust quantification of X-ray selected AGN in local (z≤ 0.25) dwarf galaxies (). We define a parent sample of 4331 dwarf galaxies found within the footprint of both the MPA-JHU galaxy catalogue (based on SDSS DR8) and 3XMM DR7, performed a careful review of the data to remove misidentifications and produced a sample of 61 dwarf galaxies that exhibit nuclear X-ray activity indicative of an AGN. We examine the optical emission line ratios of our X-ray selected sample and find that optical AGN diagnostics fail to identify 85 per cent of the sources. We then calculated the growth rates of the black holes powering our AGN in terms of their specific accretion rates (∝LX/M*, an approximate tracer of the Eddington ratio). Within our observed sample, we found a wide range of specific accretion rates. After correcting the observed sample for the varying sensitivity of 3XMM, we found further evidence for a wide range of X-ray luminosities and specific accretion rates, described by a power law. Using this corrected AGN sample we also define an AGN fraction describing their relative incidence within the parent sample. We found the AGN fraction increases with host galaxy mass (up to ≈6 per cent) for galaxies with X-ray luminosities betweenand, and by extrapolating the power law to higher luminosities, we found evidence to suggest the fraction of luminous AGN () is constant out toz≈ 0.7.
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发表时间: 2015
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