# DWARF GALAXIES WITH OPTICAL SIGNATURES OF ACTIVE MASSIVE BLACK HOLES

## Author(s): Reines, Amy E; Greene, Jenny E.; Geha, Marla

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DC FieldValueLanguage
dc.contributor.authorReines, Amy E-
dc.contributor.authorGreene, Jenny E.-
dc.contributor.authorGeha, Marla-
dc.date.accessioned2019-10-28T15:41:38Z-
dc.date.available2019-10-28T15:41:38Z-
dc.date.issued2013-10-01en_US
dc.identifier.citationReines, Amy E, Greene, Jenny E, Geha, Marla. (2013). DWARF GALAXIES WITH OPTICAL SIGNATURES OF ACTIVE MASSIVE BLACK HOLES. ASTROPHYSICAL JOURNAL, 775 (10.1088/0004-637X/775/2/116en_US
dc.identifier.issn0004-637X-
dc.identifier.urihttp://arks.princeton.edu/ark:/88435/pr1cb3j-
dc.description.abstractWe present a sample of 151 dwarf galaxies (10(8.5) less than or similar to M-* <= 10(9.5) M-circle dot) that exhibit optical spectroscopic signatures of accreting massive black holes (BHs), increasing the number of known active galaxies in this stellar-mass range by more than an order of magnitude. Utilizing data from the Sloan Digital Sky Survey Data Release 8 and stellar masses from the NASA-Sloan Atlas, we have systematically searched for active BHs in similar to 25,000 emission-line galaxies with stellar masses comparable to the Magellanic Clouds and redshifts z < 0.055. Using the narrow-line [O III]/H beta versus [N II]/H alpha diagnostic diagram, we find photoionization signatures of BH accretion in 136 galaxies, a small fraction of which also exhibit broad H alpha emission. For these broad-line active galactic nucleus (AGN) candidates, we estimate BH masses using standard virial techniques and find a range of 10(5) less than or similar to M-BH less than or similar to 10(6) M-circle dot and a median of M-BH similar to 2 x 10(5) M-circle dot. We also detect broad H alpha in 15 galaxies that have narrow-line ratios consistent with star-forming galaxies. Follow-up observations are required to determine if these are true type 1 AGN or if the broad H alpha is from stellar processes. The median absolute magnitude of the host galaxies in our active sample is M-g = -18.1 mag, which is similar to 1-2 mag fainter than previous samples of AGN hosts with low-mass BHs. This work constrains the smallest galaxies that can form a massive BH, with implications for BH feedback in low-mass galaxies and the origin of the first supermassive BH seeds.en_US
dc.language.isoen_USen_US
dc.relation.ispartofASTROPHYSICAL JOURNALen_US
dc.rightsFinal published version. Article is made available in OAR by the publisher's permission or policy.en_US
dc.titleDWARF GALAXIES WITH OPTICAL SIGNATURES OF ACTIVE MASSIVE BLACK HOLESen_US
dc.typeJournal Articleen_US
dc.identifier.doidoi:10.1088/0004-637X/775/2/116-
dc.date.eissued2013-09-13en_US
pu.type.symplectichttp://www.symplectic.co.uk/publications/atom-terms/1.0/journal-articleen_US

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