While emission-line flux ratio diagnostics are the most common technique for identifying active galactic nuclei (AGNs) in optical spectra, applying this approach to single fiber spectra of galaxies can omit entire subpopulations of AGNs. Here, we use spatially resolved spectroscopy from the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey to construct a sample of 10 galaxies where Baldwin-Philips-Terlevich line flux ratio diagnostics classify each galaxy's central $3^{\prime\prime}$ spectrum as LINER or star forming, while $>10\%$ of the spaxels in the galaxy's MaNGA footprint are classified as Seyfert. We obtain Chandra observations of these 10 galaxies with off-nuclear Seyfert regions to determine whether AGNs are actually present in them. Our main result is that 7-10 (depending on strictness of criteria) of the galaxies host one or more X-ray AGNs, even though none of them were classified as AGNs based on their single-fiber optical spectra. We find that these AGNs were not identified in the single-fiber spectra because they are AGNs in the nuclei of companion galaxies, low luminosity AGNs, dust obscured AGNs, and/or flickering AGNs. In summary, we find that off-nuclear AGN signatures may increase the number of known AGNs by a factor of two over what conventional single nuclear fiber spectra identify. Our results show that spatially resolved spectroscopy can be leveraged to reveal a more complete census of AGNs that are traditionally missed by single fiber spectra.
Active Galactic Nuclei from HeII: a more complete census of AGN in SDSS galaxies yields a new population of low-luminosity AGN in highly star-forming galaxies
A Comprehensive JWST/NIRSpec Census of Broad-line Active Galactic Nuclei: Faint, Low-mass Accretors and a Population of Little Red Dots
New York University(纽约大学);Menlo School(门洛学校);Center for Interdisciplinary Exploration & Research in Astrophysics (CIERA)(天体物理跨学科探索与研究中心);Northwestern University(西北大学)
A Census of Double-Peaked Lyman-alpha Emitters in MAGPI: Classification, Global Characteristics, and Spatially Resolved Properties
Macquarie University(麦考瑞大学);Swinburne University of Technology(斯威本科技大学);Observatori Astronòmic de la Universitat de València(瓦伦西亚大学天文台);International Centre for Radio Astronomy Research (ICRAR), Curtin University(伊萨研究中心(ICRAR),科廷大学);Sydney Institute for Astronomy, School of Physics, University of Sydney(悉尼大学物理学院悉尼天体物理学研究所);International Centre for Radio Astronomy Research (ICRAR), The University of Western Australia(伊萨研究中心(ICRAR),西澳大学)
Unveiling hidden active nuclei in MaNGA star-forming galaxies with HeII$λ$4686 line emission
星云HeII $λ$ 4686 γ ~谱线发射对于揭示活跃星系核(AGN)是有用的,这些活动星系核位于恒星形成活跃的(SF)星系中,通常被标准的BPT分类所遗漏。在这里,我们采用HeII诊断,以确定隐藏的活动星系核在本地宇宙中使用的第一次空间分辨的数据,从数据发布15映射附近的Galerkin在APO调查(MANGA DR 15)。通过结合HeII和BPT诊断的结果,我们总共选择了459个活动星系核候选者($\sim$ 10%在MaNGA DR 15),其中27个仅由HeII图确定为活动星系核。只有HeII的活动星系核由大质量(M $_*\gtrsim10^{10}$ M $_{\odot}$)SF主序星星系组成,平均亮度低于BPT选择的活动星系核。由于HeII线模糊,我们重新审视我们的人口普查会计不完整的影响,由于HeII的灵敏度限制的MANGA。因此,我们得到的MANGA中活动星系核的比例(11%)比仅BPT普查(9%)增加了,对于质量比$10^{10}$ M $_{\odot}$更大的星系,这一比例进一步增加到14%;有趣的是,在SF主序星上,这一比例增加了约2倍。大量的活动星系核在SF星系点显着的,同时代的恒星形成和黑洞吸积,一致的流体动力学模拟的结果和淬火方案的重要影响。鉴于探索前所未有的高红移与JWST和新的地面设施,通过新的发射线诊断重新审视标准的BPT分类是发现活动…
The ePESSTO+ census of ZTF nuclear transients. I. What flares in galactic nuclei?
Technical University of Denmark(丹麦技术大学);University of Belgrade(贝尔格莱德大学);University of Warsaw(华沙大学);University of Turku(图尔库大学);Institute of Space Sciences (ICE, CSIC)(空间科学研究所(ICE,CSIC));Isaac Newton Group of Telescopes(艾萨克·牛顿望远镜组);Queens University Belfast(贝尔法斯特女王大学);National Centre for Nuclear Research(国家核研究中心);University of Southampton(南安普顿大学);National Central University(中央大学);Sorbonne University(索邦大学)
The Large Early Galaxy Astrophysics Census (LEGA-C) Data Release II: dynamical and stellar population properties of z ~< 1 galaxies in the COSMOS field
Beyond the Monsters: A More Complete Census of Black Hole Activity at Cosmic Dawn
Providence College(普罗维登斯学院);The University of Texas at Austin(德克萨斯大学奥斯汀分校);NASA Goddard Space Flight Center(美国宇航局戈达德太空飞行中心);University of Connecticut(康涅狄格大学);The Pennsylvania State University(宾夕法尼亚州立大学);University of Massachusetts Amherst(马萨诸塞大学阿默斯特分校);Space Telescope Science Institute(空间望远镜科学研究所);Ecole Polytechnique Fédérale de Lausanne (EPFL)(洛桑联邦理工学院);University of Louisville(路易斯维尔大学);Rochester Institute of Technology(罗切斯特理工学院);Colby College(科尔比学院);Harvard University(哈佛大学);University of Chinese Academy of Sciences (UCAS)(中国科学院大学);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);Beijing Normal University(北京师范大学)
The Galactic Census of High- and Medium-mass Protostars. IV. Molecular Clump Radiative Transfer, Mass Distributions, Kinematics, and Dynamical Evolution
An (in)complete NIRSpec census of Balmer absorption in Type 1 AGN -- radiation-driven outflows in little red dots, quasars and variable stars
University of Cambridge(剑桥大学);Kavli Institute for Cosmology, University of Cambridge(剑桥大学卡弗里宇宙学研究所);Cavendish Laboratory, University of Cambridge(剑桥大学卡文迪许实验室);University College London(伦敦大学学院)
Testing the Radio-Selection Method of Dual Active Galactic Nuclei in the Stripe 82 Field
我们测试合并引起的双活动星系核(dAGN)的范例使用的样本35个射电星系对SDSS条纹82字段。使用凯克光谱,我们确认21对具有一致的红移,构成运动学对,其余14对是视线投影。我们通过发射线比,等效宽度,以及超过恒星形成预测输出的无线电功率的光学光谱特征进行分类。我们发现6个星系被归类为LINER,7个是AGN/星暴复合星系。大部分LINER是退休星系,而复合星系可能有活动星系核的贡献。所有的运动学对都显示出比预期的恒星形成水平高出10 $\times$的射电功率,暗示着射电活动星系核的贡献。我们还分析了来自NSF的Karl G. Jansky甚大阵列的17个运动学对。我们发现6对(2个新的,4个以前已知的)主机两个独立的无线电核心,确认其作为dAGN的状态。剩下的11对包含单个活动星系核,其中大多数显示出突出的喷流/叶重叠其同伴。我们的最终普查表明,dAGN的占空比略高于纯粹随机加油的预测,尽管需要更大的样本(可能从VLASS中挑选)来完全解决dAGN部分。我们的结论是,虽然dAGN在条纹82领域是罕见的,合并过程中发挥了一定的作用,在他们的触发,它有利于低到中等水平的吸积。
Local Luminous Infrared Galaxies. I. Spatially resolved observations with Spitzer/IRS
本文介绍了15个本地亮红外星系(LIRGs)的Spitzer/IRS光谱测绘观测结果。在本文中,我们研究了中红外发射的空间变化,其中包括:精细结构线,分子氢线,多环芳香族特征(PAHs),连续发射和9.7um硅酸盐特征。我们还比较了核谱和积分谱。我们发现,恒星形成发生在扩展区域(几个千秒差距)探测的PAH排放以及[NeII]和[NeIII]排放。积分PAH发射和9.7um硅酸盐特征的行为与本地星暴星系相似。我们还发现[NeIII]/[NeII]比值的最小值往往位于核处,其值低于我们LIRG和附近星系的HII区。这可能是在LIRG的核密度增加负责较小的核[NeIII]/[NeII]的比例。这包括一些质量最大的恒星仍然嵌入在超紧凑的HII区域的可能性。在我们的样品的大部分11.3 μ m的PAH发射似乎比尘埃5.5 μ m的连续发射更广泛。我们发现11.3 μ m PAH/7.7 μ m PAH和[NeII]/11.3 μ m PAH的比值与恒星星族的年龄有关。较小和较大的比值分别表明最近的恒星形成。估计的温暖(300 K < T < 1000 K)氢分子质量为10^8太阳质量,这与ULIRGs、局部星暴和塞弗特星系中发现的质量相似。最后,我们发现,[NeII]的速度场在我们的样本中的大多数LIRG是兼容的旋转盘在~kpc尺度,他们是在一个很好的协议与H-α速度场。
A Spatially Resolved Evolutionary Sequence of Multi-wavelength AGN Host Galaxies
Max Planck Institute for Astrophysics(马克斯·普朗克天体物理学研究所);Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS(中国科学院南美天文中心,国家天文台,中国科学院);Institute for Astronomy, University of Edinburgh(爱丁堡大学天体物理研究所);Leiden Observatory, Leiden University(莱顿大学莱顿天文台);Department of Physics, Astronomy and Mathematics, University of Hertfordshire(赫特福德大学物理、天文与数学系)
Spectrally and spatially resolved (sub)millimeter HCN-to-HCO$^{+}$ flux ratios in nearby ultraluminous infrared galaxies
National Astronomical Observatory of Japan, National Institutes of Natural Sciences (NINS)(日本国立天文台,国立自然科学研究院);Department of Astronomy, School of Science, Graduate University for Advanced Studies (SOKENDAI)(高级研究大学院大学(SOKENDAI)理学部天文学科);Toyo University(东洋大学);Institute of Pure and Applied Sciences, University of Tsukuba(筑波大学纯应用科学研究所);Tomonaga Center for the History of the Universe, University of Tsukuba(筑波大学丰顺伽宇宙历史中心);Tsukuba Institute for Advanced Research (TIAR), University of Tsukuba(筑波大学筑波高等研究院 (TIAR));Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(日本宇宙航空研究开发机构宇宙科学研究所)