A New Sample of (Wandering) Massive Black Holes in Dwarf Galaxies from High-resolution Radio Observations

dc.contributor.authorReines, Amy E.
dc.contributor.authorCondon, James J.
dc.contributor.authorDarling, Jeremy
dc.contributor.authorGreene, Jenny E.
dc.date.accessioned2021-03-10T18:34:53Z
dc.date.available2021-03-10T18:34:53Z
dc.date.issued2020-01
dc.description.abstractWe 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 (~8–12 GHz), yielding a typical angular resolution of ~0farcs25 and rms noise of ~15 μJy. Our targets were selected by crossmatching galaxies with stellar masses Msstarf ≤ 3 × 109 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.en_US
dc.identifier.citationReines, Amy E., James J. Condon, Jeremy Darling, and Jenny E. Greene. “A New Sample of (Wandering) Massive Black Holes in Dwarf Galaxies from High-Resolution Radio Observations.” The Astrophysical Journal 888, no. 1 (January 3, 2020): 36. doi:10.3847/1538-4357/ab4999.en_US
dc.identifier.issn1538-4357
dc.identifier.urihttps://scholarworks.montana.edu/handle/1/16156
dc.language.isoen_USen_US
dc.titleA New Sample of (Wandering) Massive Black Holes in Dwarf Galaxies from High-resolution Radio Observationsen_US
dc.typeArticleen_US
mus.citation.extentfirstpage36en_US
mus.citation.issue1en_US
mus.citation.journaltitleThe Astrophysical Journalen_US
mus.citation.volume888en_US
mus.data.thumbpage5en_US
mus.identifier.doi10.3847/1538-4357/ab4999en_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.departmentPhysics.en_US
mus.relation.universityMontana State University - Bozemanen_US

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