未分类的Burst Alert望远镜活动星系核的一种新的全色分类
A new panchromatic classification of unclassified Burst Alert Telescope active galactic nuclei
摘要：
我们收集的数据在所有频率的新来源分类为未知的活动星系核（AGN）在最新的突发警报望远镜（BAT）的全天硬X射线目录。针对这36个观测到红移的源，我们计算了它们从射电到$γ$射线的光谱能量分布，目的是对这些天体进行分类。我们应用的发射模型，试图重现所获得的SED，包括：i）一个标准的薄吸积盘连同一个模糊的环面和X射线日冕; ii）一个两个温度厚平流为主的流动; iii）一个模糊的活动星系核模型，占沿视线的吸收在千伏能量和光学波段; iv）描述类blazar天体喷流发射的唯象模型。我们将模型与SWIRE模板库结合起来，以解释宿主星系的发射。对于每个来源，我们发现数据和我们的模型之间有很好的一致性。考虑到源被选择在硬X射线波段，这是相当不受吸收，我们预计并发现了很大一部分的吸收无线电安静的活动星系核（36个中的31个）和一些额外的罕见的无线电大声源（36个中的5个），因为在硬X射线喷流发射是重要的对齐喷流由于由聚束效应产生的提升。通过我们的工作，我们可以证实一个假设，即一些星系，其光谱缺乏活动星系核发射功能，主机一个模糊的活动核。我们使用的方法被证明是有效的，在快速识别对象，常用的方法是无法分类。
英文摘要：
We collect data at all frequencies for the new sources classified as unknown active galactic nuclei (AGNs) in the latest Burst Alert Telescope (BAT) all-sky hard X-ray catalog. Focusing on the 36 sources with measured redshift, we compute their spectral energy distribution (SED) from radio to $γ$-rays with the aim to classify these objects. We apply emission models that attempt to reproduce the obtained SEDs, including: i) a standard thin accretion disk together with an obscuring torus and a X-ray corona; ii) a two temperature thick advection-dominated flow; iii) an obscured AGN model, accounting for absorption along the line of sight at kiloelectronvolt energies and in the optical band; and iv) a phenomenological model to describe the jet emission in blazar-like objects. We integrate the models with the SWIRE template libraries to account for the emission of the host galaxy. For every source we found a good agreement between data and our model. Considering that the sources were selected in the hard X-ray band, which is rather unaffected by absorption, we expected and found a large fraction of absorbed radio-quiet AGNs (31 out of 36) and some additional rare radio-loud sources (5 out of 36), since the jet emission in hard X-rays is important for aligned jets owing to the boost produced by the beaming effect. With our work we can confirm the hypothesis that a number of galaxies, whose optical spectra lack AGN emission features, host an obscured active nucleus. The approach we used proved to be efficient in rapidly identifying objects, which commonly used methods were not able to classify.
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