UGC 4211: A Confirmed Dual Active Galactic Nucleus in the Local Universe at 230 pc Nuclear Separation
Michael J. Koss, Ezequiel Treister, Darshan Kakkad, J. Andrew Casey-Clyde, Taiki Kawamuro, Jonathan Williams, Adi Foord, Benny Trakhtenbrot, Franz E. Bauer, Geo… 展开作者
Michael J. Koss, Ezequiel Treister, Darshan Kakkad, J. Andrew Casey-Clyde, Taiki Kawamuro, Jonathan Williams, Adi Foord, Benny Trakhtenbrot, Franz E. Bauer, George C. Privon, Claudio Ricci, Richard Mushotzky, Loreto Barcos-Munoz, Laura Blecha, Thomas Connor, Fiona Harrison, Tingting Liu, Macon Magno, Chiara M. F. Mingarelli, Francisco Muller-Sanchez, Kyuseok Oh, T. Taro Shimizu, Krista L. Smith, Daniel Stern, Miguel Parra Tello, C. Megan Urry
We present multi-wavelength high-spatial resolution (~0.1'', 70 pc) observations of UGC 4211 at z=0.03474, a late-stage major galaxy merger at the closest nuclear separation yet found in near-IR imaging (0.32'', ~230 pc projected separation). Using Hubble Space Telescope/STIS, VLT/MUSE+AO, Keck/OSIRIS+AO spectroscopy, and ALMA observations, we show that the spatial distribution, optical and NIR emission lines, and millimeter continuum emission are all consistent with both nuclei being powered by accreting supermassive black holes (SMBHs). Our data, combined with common black hole mass prescriptions, suggests that both SMBHs have similar masses, log MBH~8.1 (south) and log MBH~8.3 (north), respectively. The projected separation of 230 pc (~6X the black hole sphere of influence) represents the closest-separation dual AGN studied to date with multi-wavelength resolved spectroscopy and shows the potential of nuclear (<50 pc) continuum observations with ALMA to discover hidden growing SMBH pairs. While the exact occurrence rate of close-separation dual AGN is not yet known, it may be surprisingly high, given that UGC 4211 was found within a small, volume-limited sample of nearby hard X-ray detected AGN. Observations of dual SMBH binaries in the sub-kpc regime at the final stages of dynamical friction provide important constraints for future gravitational wave observatories.
UGC 2369S: a Kpc Scale Triple Merger Candidate Identified in a Nearby Luminous Infrared Galaxy
California Institute of Technology（加州理工学院）；Eureka Scientific（尤里卡科学）；University of California, Berkeley（加利福尼亚大学伯克利分校）；Max-Planck-Institut für extraterrestrische Physik（马克斯·普朗克地外物理研究所）；Kavli Institute for Astronomy and Astrophysics, Peking University（北京大学科维理天文与天体物理研究所）
Direct VLBI evidence for a buried AGN in the triple-merger LIRG UGC 2369S
Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences（孔科利天文台，HUN-REN 天文学与地球科学研究中心）；School of Astronomy and Space Science, University of Chinese Academy of Sciences（中国科学院大学天文与空间科学学院）；Xinjiang Astronomical Observatory, Chinese Academy of Sciences（中国科学院新疆天文台）；Department of Astronomy, Institute of Physics and Astronomy, ELTE Eötvös Loránd University（罗兰大学物理与天文学研究所天文学系）；HUN-REN–ELTE Extragalactic Astrophysics Research Group, ELTE Eötvös Loránd University（HUN-REN–罗兰大学河外天体物理学研究组）
Revealing a multi-zone circumnuclear dust response in UGC 11487 through phase-resolved WISE W1--W2 diagnostics
Main Astronomical Observatory of the NAS of Ukraine（乌克兰国家科学院主天文台）；International Centre for Astronomical, Medical and Ecological Research（国际天文、医学与生态研究中心）
Two Peas in a Pod: The First Confirmed Dual Active Galactic Nucleus within a Green Pea Galaxy System
Czech Academy of Sciences（捷克科学院）；Max Planck Institute for Extraterrestrial Physics（马克斯·普朗克地外物理研究所）；California Institute of Technology（加州理工学院）；U.S. Naval Observatory（美国海军天文台）；Jet Propulsion Laboratory, California Institute of Technology（加州理工学院喷气推进实验室）；University of Crete（克里特大学）；Foundation for Research and Technology–Hellas (FORTH)（希腊研究与技术基金会）
Diverse Origins of Broad H$α$ Lines in Heavily Obscured AGNs Revealed by Multi-epoch Spectroscopy
Academia Sinica Institute of Astronomy and Astrophysics（中央研究院天文及天文物理研究所）；The University of Tokyo（东京大学）；National Astronomical Observatory of Japan（日本国立天文台）
Detection of a triple nucleus in the Wolf-Rayet composite Sy 2 galaxy NGC 6764
Landessternwarte, Zentrum für Astronomie der Universität Heidelberg（海德堡大学天文台）；Heidelberg Institute for Theoretical Studies（海德堡理论研究所）；LBT Observatory, University of Arizona（亚利桑那大学LBT天文台）
Varstrometry for Off-nucleus and Dual sub-Kpc AGN (VODKA): Radio Classification of High-Redshift Dual AGN Candidates with the Very Large Array
University of Illinois at Urbana-Champaign（伊利诺伊大学厄巴纳-香槟分校）；National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign（国家超级计算应用中心，伊利诺伊大学厄巴纳-香槟分校）；Johns Hopkins University（约翰斯·霍普金斯大学）
JWST Observations of the Double Nucleus in NGC 4486B: Possible Evidence for a Recent Binary SMBH Merger and Recoil
University of Michigan（密歇根大学）；Villanova University（维拉诺瓦大学）；Yale University（耶鲁大学）；JILA and Department of Astrophysical and Planetary Sciences, CU Boulder（科罗拉多大学博尔德分校天体物理与行星科学系及JILA研究所）；New York University Abu Dhabi（阿布扎比纽约大学）；Center for Astrophysics and Space Science (CASS), New York University Abu Dhabi（阿布扎比纽约大学天体物理学与空间科学中心）；University of Calgary（卡尔加里大学）；University of Victoria（维多利亚大学）；National Research Council of Canada（加拿大国家研究委员会）
