A Catalog of 71 Coronal Line Galaxies in MaNGA: [Ne v] Is an Effective AGN Tracer
A Catalog of 71 Coronal Line Galaxies in MaNGA: [Ne v] Is an Effective AGN Tracer
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DOI：
10.3847/1538-4357/acb772
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
J. Negus;J. Comerford;Francisco Muller Sanchez;M. Revalski;R. Riffel;K. Bundy;R. Nevin;S. Rembold
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文献类型：
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作者：
J. Negus;J. Comerford;Francisco Muller Sanchez;M. Revalski;R. Riffel;K. Bundy;R. Nevin;S. Rembold
尽管活动星系核（AGN）在星系演化中的重要性，但准确识别AGN通常具有挑战性，因为常见的AGN诊断可能会被星星形成和其他效应（例如，Baldwin-Phillips-Terlevich图）。然而，一个有希望的识别活动星系核的方法是“日冕发射线”（“CL”），它是电离势≥100 eV的高度电离的气体。这些CL可以作为活动星系核强电离连续体的良好信号。为了确定CL实际上是强大的活动星系核示踪剂，我们组装和分析最大的目录光学CL星系使用斯隆数字巡天的映射附近的Galerkin在阿帕奇点天文台（MANGA）目录。我们在最终MaNGA目录中的10，010个独特星系中的71个MaNGA星系中检测到CL发射，置信度≥5σ。在我们的样本中，我们测量了[Ne v]λ3347，λ3427，[Fe vii]λ3586，λ3760，λ6086和[Fe x]λ6374的发射，并将CL星系与一个由宽线，X射线，IR和射电观测证实的AGN目录进行了交叉匹配。我们发现，[Ne v]发射比[Fe vii]和[Fe x]发射更适合于识别高光度活动星系核。此外，我们发现，最少的尘埃消光CL星系产生最铁CL检测。我们认为，在我们的样品中，大部分的铁CL被破坏的尘埃颗粒在星系中的最高[O iii]光度，和AGN在星系中的低[O iii]光度可能太弱，使用传统的技术来检测。
Despite the importance of active galactic nuclei (AGNs) in galaxy evolution, accurate AGN identification is often challenging, as common AGN diagnostics can be confused by contributions from star formation and other effects (e.g., Baldwin–Phillips–Terlevich diagrams). However, one promising avenue for identifying AGNs is “coronal emission lines” (“CLs”), which are highly ionized species of gas with ionization potentials ≥100 eV. These CLs may serve as excellent signatures for the strong ionizing continuum of AGNs. To determine if CLs are in fact strong AGN tracers, we assemble and analyze the largest catalog of optical CL galaxies using the Sloan Digital Sky Survey's Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) catalog. We detect CL emission in 71 MaNGA galaxies, out of the 10,010 unique galaxies from the final MaNGA catalog, with ≥5σ confidence. In our sample, we measure [Ne v]λ3347, λ3427, [Fe vii]λ3586, λ3760, λ6086, and [Fe x]λ6374 emission and crossmatch the CL galaxies with a catalog of AGNs that were confirmed with broad-line, X-ray, IR, and radio observations. We find that [Ne v] emission, compared to [Fe vii] and [Fe x] emission, is best at identifying high-luminosity AGNs. Moreover, we find that the CL galaxies with the least dust extinction yield the most iron CL detections. We posit that the bulk of the iron CLs are destroyed by dust grains in the galaxies with the highest [O iii] luminosities in our sample, and that AGNs in the galaxies with low [O iii] luminosities are possibly too weak to be detected using traditional techniques.