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A similar to 50,000 M-circle dot SOLAR MASS BLACK HOLE IN THE NUCLEUS OF RGG 118

Author(s): Baldassare, Vivienne F; Reines, Amy E; Gallo, Elena; Greene, Jenny E.

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Abstract: Scaling relations between black hole (BH) masses and their host galaxy properties have been studied extensively over the last two decades, and point toward co-evolution of central massive BHs and their hosts. However, these relations remain poorly constrained for BH masses below similar to 10(6) M-circle dot. Here we present optical and X-ray observations of the dwarf galaxy RGG 118 taken with the Magellan Echellette Spectrograph on the 6.5 m Clay Telescope and Chandra X-ray Observatory. Based on Sloan Digital Sky Survey spectroscopy, RGG 118 was identified as possessing narrow emission line ratios indicative of photoionization partly due to an active galactic nucleus. Our higher resolution spectroscopy clearly reveals broad H alpha emission in the spectrum of RGG 118. Using virial BH mass estimate techniques, we calculate a BH mass of similar to 50,000 M-circle dot. We detect a nuclear X-ray point source in RGG 118, suggesting a total accretion powered luminosity of L = 4 x 10(40) erg s(-1), and an Eddington fraction of similar to 1%. The BH in RGG 118 is the smallest ever reported in a galaxy nucleus and we find that it lies on the extrapolation of the M-BH-sigma(*) relation to the lowest masses yet.
Publication Date: 10-Aug-2015
Electronic Publication Date: 11-Aug-2015
Citation: Baldassare, Vivienne F, Reines, Amy E, Gallo, Elena, Greene, Jenny E. (2015). A similar to 50,000 M-circle dot SOLAR MASS BLACK HOLE IN THE NUCLEUS OF RGG 118. ASTROPHYSICAL JOURNAL LETTERS, 809 (10.1088/2041-8205/809/1/L14
DOI: doi:10.1088/2041-8205/809/1/L14
ISSN: 2041-8205
EISSN: 2041-8213
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Type of Material: Journal Article
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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