Journal
ASTROPHYSICAL JOURNAL
Volume 888, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/ab4999
Keywords
Intermediate-mass black holes; Dwarf galaxies; Radio sources; Very Large Array; Active galactic nuclei; AGN host galaxies; Dwarf irregular galaxies; Supermassive black holes
Categories
Funding
- NASA [NAS5-98034]
- NASA Astrophysics Data Analysis Program [08-ADP08-0072]
- NSF [AST-1211644]
- Alfred P. Sloan Foundation
- U.S. Department of Energy Office of Science
- Center for High-Performance Computing at the University of Utah
- Brazilian Participation Group
- Carnegie Institution for Science
- Carnegie Mellon University
- Chilean Participation Group
- French Participation Group
- Harvard-Smithsonian Center for Astrophysics
- Instituto de Astrofisica de Canarias
- The Johns Hopkins University
- Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo
- Korean Participation Group
- Lawrence Berkeley National Laboratory
- Leibniz Institut fur Astrophysik Potsdam (AIP)
- Max-Planck-Institut fur Astronomie (MPIA Heidelberg)
- Max-Planck-Institut fur Astrophysik (MPA Garching)
- Max-Planck-Institut fur Extraterrestrische Physik (MPE)
- National Astronomical Observatories of China
- New Mexico State University
- New York University
- University of Notre Dame
- Observatario Nacional/MCTI
- The Ohio State University
- Pennsylvania State University
- Shanghai Astronomical Observatory
- United Kingdom Participation Group
- Universidad Nacional Autonoma de Mexico
- University of Arizona
- University of Colorado Boulder
- University of Oxford
- University of Portsmouth
- University of Utah
- University of Virginia
- University of Washington
- University of Wisconsin
- Vanderbilt University
- Yale University
- Dark Energy Camera Legacy Survey (DECaLS) [2014B-0404]
- Beijing-Arizona Sky Survey (BASS) [2015A-0801]
- Mayall z-band Legacy Survey (MzLS) [2016A-0453]
- U.S. Department of Energy
- U.S. National Science Foundation
- Ministry of Science and Education of Spain
- Science and Technology Facilities Council of the United Kingdom
- Higher Education Funding Council for England
- National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign
- Kavli Institute of Cosmological Physics at the University of Chicago
- Center for Cosmology and Astro-Particle Physics at the Ohio State University
- Financiadora de Estudos e Projetos
- Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico
- Ministerio da Ciencia, Tecnologia e Inovacao
- Deutsche Forschungsgemeinschaft
- Argonne National Laboratory
- University of California at Santa Cruz
- University of Cambridge
- Centro de Investigaciones Energeticas
- Medioambientales y Tecnologicas-Madrid
- University of Chicago
- University College London
- DES-Brazil Consortium
- University of Edinburgh
- Eidgenossische Technische Hochschule (ETH) Zurich
- Fermi National Accelerator Laboratory
- University of Illinois at Urbana-Champaign
- Institut de Ciencies de l'Espai (IEEC/CSIC)
- Institut de Fisica d'Altes Energies
- Ludwig-Maximilians Universitat Munchen
- Excellence Cluster Universe
- University of Michigan
- National Optical Astronomy Observatory
- University of Nottingham
- Ohio State University
- University of Pennsylvania
- SLAC National Accelerator Laboratory, Stanford University
- University of Sussex
- Texas AM University
- Chinese Academy of Sciences (the Strategic Priority Research Program The Emergence of Cosmological Structures Grant) [XDB09000000]
- Special Fund for Astronomy from the Ministry of Finance
- External Cooperation Program of Chinese Academy of Sciences [114A11KYSB20160057]
- Chinese National Natural Science Foundation [11433005]
- National Aeronautics and Space Administration
- Office of Science, Office of High Energy Physics of the U.S. Department of Energy [DE-AC02-05CH1123]
- National Energy Research Scientific Computing Center, a DOE Office of Science User Facility [DE-AC02-05CH1123]
- U.S. National Science Foundation, Division of Astronomical Sciences [AST-0950945]
- Mitchell Institute for Fundamental Physics and Astronomy at Texas AM University
Ask authors/readers for more resources
We present a sample of nearby dwarf galaxies with radio-selected accreting massive black holes (BHs), the majority of which are non-nuclear. We observed 111 galaxies using sensitive, high-resolution observations from the Karl G. Jansky Very Large Array (VLA) in its most extended A-configuration at X band (similar to 8-12 GHz), yielding a typical angular resolution of similar to 025 and rms noise of similar to 15 mu Jy. Our targets were selected by crossmatching galaxies with stellar masses M-& x22c6; <= 3 x 10(9) M and redshifts z < 0.055 in the NASA-Sloan Atlas with the VLA Faint Images of the Radio Sky at Twenty centimeters Survey. With our new high-resolution VLA observations, we detect compact radio sources toward 39 galaxies and carefully evaluate possible origins for the radio emission, including thermal H II regions, supernova remnants, younger radio supernovae, background interlopers, and active galactic nuclei (AGNs) in the target galaxies. We find that 13 dwarf galaxies almost certainly host active massive BHs, despite the fact that only one object was previously identified as having optical signatures of an AGN. We also identify a candidate dual radio AGN in a more massive galaxy system. The majority of the radio-detected BHs are offset from the center of the host galaxies, with some systems showing signs of interactions/mergers. Our results indicate that massive BHs need not always live in the nuclei of dwarf galaxies, confirming predictions from simulations. Moreover, searches attempting to constrain BH seed formation using observations of dwarf galaxies need to account for such a population of wandering BHs.
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