SIMBAD references

2013ApJ...775..116R - Astrophys. J., 775, 116 (2013/October-1)

Dwarf galaxies with optical signatures of active massive black holes.


Abstract (from CDS):

We present a sample of 151 dwarf galaxies (108.5 ≲ M{sstarf} ≲ 109.5 M) 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]/Hβ versus [N II]/Hα diagnostic diagram, we find photoionization signatures of BH accretion in 136 galaxies, a small fraction of which also exhibit broad Hα emission. For these broad-line active galactic nucleus (AGN) candidates, we estimate BH masses using standard virial techniques and find a range of 105 ≲ MBH ≲ 106 M and a median of MBH∼ 2x105 M. We also detect broad Hα 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 Hα is from stellar processes. The median absolute magnitude of the host galaxies in our active sample is Mg= -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.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: dwarf - galaxies: nuclei - galaxies: Seyfert

VizieR on-line data: <Available at CDS (J/ApJ/775/116): table1.dat table2.dat>

Nomenclature: Tables 1-2: [RGG2013] NNN (Nos 1-136).

Simbad objects: 174

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