NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-07-18 T15:38:58 PDT
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For refcode 2013ApJ...775..116R:
Retrieve 152 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
2013ApJ...775..116R Dwarf Galaxies with Optical Signatures of Active Massive Black Holes Reines, Amy E.; Greene, Jenny E.; Geha, Marla Abstract. We present a sample of 151 dwarf galaxies (10^8.5^ <~ M_sstarf_ <~ 10^9.5^ M_sun_) 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 ~25,000 emission-line galaxies with stellar masses comparable to the Magellanic Clouds and redshifts z < 0.055. Using the narrow-line [O III]/Hbeta versus [N II]/Halpha diagnostic diagram, we find photoionization signatures of BH accretion in 136 galaxies, a small fraction of which also exhibit broad Halpha 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^ <~ M_BH_ <~ 10^6^ M_sun_ and a median of M_BH_ ~ 2 x 10^5^ M_sun_. We also detect broad Halpha 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 Halpha is from stellar processes. The median absolute magnitude of the host galaxies in our active sample is M_g_ = --18.1 mag, which is ~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. Key words: galaxies: active, galaxies: dwarf, galaxies: nuclei, galaxies: Seyfert
Retrieve 152 NED objects in this reference.
Please click here for ADS abstract

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