We conduct a deep mid-infrared census of nine massive galaxy clusters at (0<z<1.3) with a total of ~1500 spectroscopically confirmed member galaxies using Spitzer/IRAC photometry and established mid-infrared color selection techniques. Of the 949 cluster galaxies that are detected in at least three of the four IRAC channels at the >3 sigma level, we identify 12 that host mid-infrared selected active galactic nuclei (IR-AGN). To compare the IR-AGN across our redshift range, we define two complete samples of cluster galaxies: (1) optically-selected members with rest-frame V(AB) magnitude <-21.5 and (2) mid-IR selected members brighter than (M*+0.5), i.e. essentially a stellar mass cut. In both samples, we measure \agnfrac ~1% with a strong upper limit of ~3% at z<1. This uniformly low IR-AGN fraction at z<1 is surprising given the fraction of 24 micron sources in the same galaxy clusters is observed to increase by about a factor of four from z~0 to z~1; this indicates that most of the detected 24 micron flux is due to star formation. Only in our single galaxy cluster at z=1.24 is the IR-AGN fraction measurably higher at ~15% (all members; ~70% for late-types only). In agreement with recent studies, we find the cluster IR-AGN are predominantly hosted by late-type galaxies with blue optical colors, i.e. members with recent/ongoing star formation. The four brightest IR-AGN are also X-ray sources; these IR+X-ray AGN all lie outside the cluster core (Rproj>0.5 Mpc) and are hosted by highly morphologically disturbed members. Although our sample is limited, our results suggest that \agnfrac in massive galaxy clusters is not strongly correlated with star formation at z<1, and that IR-AGN have a more prominent role at z>1.
The Spitzer Space Telescope Survey of the Orion A & B Molecular Clouds - Part I: A Census of Dusty Young Stellar Objects and a Study of their Mid-IR Variability
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)
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…
Mid-Infrared Outbursts in Nearby Galaxies: Nuclear Obscuration and Connections to Hidden Tidal Disruption Events and Changing-Look Active Galactic Nuclei
Trinity College Dublin(都柏林三一学院);Royal Holloway, University of London(伦敦大学皇家霍洛威学院);University of Manchester(曼彻斯特大学);Curtin University(科廷大学);Université d’Orléans(奥尔良大学);CNRS(法国国家科学研究中心);Institute of Space Sciences (CSIC-ICE)(空间科学研究所(CSIC-ICE));Institut d’Estudis Espacials de Catalunya (IEEC)(加泰罗尼亚空间研究研究所(IEEC));ASTRON, the Netherlands Institute for Radio Astronomy(荷兰射电天文研究所);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台)
Protoplanetary Disk Evolution in a Low-Metallicity Environment: JWST's First Mid-Infrared Census of Low-Mass Stars
National Astronomical Observatory of Japan(日本国立天文台);SOKENDAI (The Graduate University for Advanced Studies)(综合研究大学院大学);Graduate School of Science, Nagoya University(名古屋大学理学研究科);Institute of Astronomy, School of Science, University of Tokyo(东京大学理学部天体物理系);Kiso Observatory, Institute of Astronomy, School of Science, University of Tokyo(东京大学理学部天文科学系木曾观测站);Jet Propulsion Laboratory, California Institute of Technology(加州理工学院喷气推进实验室)
Identifying quasars with astrometric and mid-infrared methods from APOP and ALLWISE
上下文类星体在空间上是静止的,在天体测量学中定义参考系时,它们是必不可少的天体。然而,对类星体的普查还远未完成。由于活动星系核在中红外波段表现出特殊的外观,因此可以利用中红外波段的颜色来寻找类星体候选者,但这些方法都无法将类星体从活动星系核中分离出来。目标。我们的研究目的是利用天体测量和中红外方法筛选类星体,获得可靠的候选类星体目录。方法.我们使用了一个接近零的自行标准结合WISE(全天空宽场红外巡天探测器)[W1-W2]颜色来选择候选类星体。[W1-W2]颜色标准由两个样本的线性边界定义:LAMOST DR 5类星体,作为类星体样本,LAMOST DR 5恒星和星系,作为非类星体样本。评价污染和完整性。结果我们提出了一个662753类星体候选者的目录,约75%的完整性和77.2%的可靠性。
Rogue Ones: Orbital census of Galactic Cepheids and their Anomalies
INAF - Osservatorio Astrofisico di Torino(意大利国家天体物理研究所都灵天文台);Astronomical Observatory, University of Warsaw(华沙大学天文台);School of Astronomy and Space Science, Nanjing University(南京大学天文与空间科学学院);Key Laboratory of Modern Astronomy and Astrophysics, Ministry of Education(教育部现代天文学与天体物理学重点实验室);Research School of Astronomy & Astrophysics, Australian National University(澳大利亚国立大学天文与天体物理研究学院)
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)
Hubble Space Telescope Captures UGC~12591: Bulge/Disc Properties, Star Formation and `Missing Baryons' Census in a Very Massive and Fast Spinning Hybrid Galaxy
Mid-Infrared Colors of Dwarf Galaxies: Young Starbursts Mimicking Active Galactic Nuclei
在矮星系中寻找活动星系核(AGN)对于我们理解早期宇宙中形成的种子黑洞具有重要意义。在这里,我们测试在低星系质量的活动星系核活动的红外选择方法。我们的母星系样本由斯隆数字巡天中的约18,000个邻近矮星系(M*< 3 x 10^9 Msun,$z<0.055$)组成,在宽视场红外巡天探测器(WISE)发布的AllWISE数据的前三个波段中有重要的探测结果。首先,我们证明了大多数矮星系中的光学选择活动星系核没有被选择为活动星系核使用WISE红外颜色诊断和红外辐射是由宿主星系占主导地位。然后,我们研究了光学选择的成星矮星系的红外特性,发现具有最红红外颜色的星系是最紧凑的,具有蓝色光学颜色,年轻的恒星年龄和大的比恒星形成率。这些结果表明,在使用红外颜色选择矮星系中的活动星系时必须非常小心,因为恒星形成矮星系能够以模仿更明亮活动星系的红外颜色的方式加热尘埃。特别是,一个简单的$\mathrm{W1}-\mathrm{W2}$颜色切割单独不应该被用来选择矮星系的活动星系核。考虑到这些复杂性,我们提出了一个值得后续观测的41个矮星系的样本,这些矮星系落在WISE红外色空间中,通常被更明亮的活动星系核占据。
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)
Black Hole Properties of Type-1 Active Galactic Nuclei in the North Ecliptic Pole Wide Field: I. Mid-infrared Sources with Optical Counterparts
Pusan National University(釜山国立大学);Seoul National University(首尔国立大学);Kyungpook National University(庆北国立大学);Yonsei University(延世大学);Sejong University(世宗大学)