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Title: THE LOW-MASS, HIGHLY ACCRETING BLACK HOLE ASSOCIATED WITH THE ACTIVE GALACTIC NUCLEUS 2XMM J123103.2+110648

Abstract

Optical spectra and images taken with the Baade 6.5 m Magellan telescope confirm that 2XMM J123103.2+110648, a highly variable X-ray source with an unusually soft spectrum, is indeed associated with a type 2 (narrow-line) active nucleus at a redshift of z = 0.11871. The absence of broad H{alpha} or H{beta} emission in an otherwise X-ray unabsorbed source suggests that it intrinsically lacks a broad-line region. If, as in other active galaxies, the ionized gas and stars in J1231+1106 are in approximate virial equilibrium, and the M{sub BH} - {sigma}{sub *} relation holds, the exceptionally small velocity dispersion of {sigma} = 33.5 km s{sup -1} for [O III] {lambda}5007 implies that M{sub BH} Almost-Equal-To 10{sup 5} M{sub Sun }, among the lowest ever detected. Such a low black hole mass is consistent with the general characteristics of the host, a small, low-luminosity, low-mass disk galaxy. We estimate the Eddington ratio of the black hole to be {approx}>0.5, in good agreement with expectations based on the X-ray properties of the source.

Authors:
;  [1];  [2]
  1. Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States)
  2. Department of Physics, Ehime University, Matsuyama, Ehime 790-8577 (Japan)
Publication Date:
OSTI Identifier:
22078465
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 759; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BLACK HOLES; EMISSION; GALAXIES; GALAXY NUCLEI; IMAGES; IONIZED GASES; LUMINOSITY; MASS; RED SHIFT; SPECTRA; STAR ACCRETION; TELESCOPES; X RADIATION; X-RAY SOURCES

Citation Formats

Ho, Luis C., Kim, Minjin, and Terashima, Yuichi. THE LOW-MASS, HIGHLY ACCRETING BLACK HOLE ASSOCIATED WITH THE ACTIVE GALACTIC NUCLEUS 2XMM J123103.2+110648. United States: N. p., 2012. Web. doi:10.1088/2041-8205/759/1/L16.
Ho, Luis C., Kim, Minjin, & Terashima, Yuichi. THE LOW-MASS, HIGHLY ACCRETING BLACK HOLE ASSOCIATED WITH THE ACTIVE GALACTIC NUCLEUS 2XMM J123103.2+110648. United States. doi:10.1088/2041-8205/759/1/L16.
Ho, Luis C., Kim, Minjin, and Terashima, Yuichi. Thu . "THE LOW-MASS, HIGHLY ACCRETING BLACK HOLE ASSOCIATED WITH THE ACTIVE GALACTIC NUCLEUS 2XMM J123103.2+110648". United States. doi:10.1088/2041-8205/759/1/L16.
@article{osti_22078465,
title = {THE LOW-MASS, HIGHLY ACCRETING BLACK HOLE ASSOCIATED WITH THE ACTIVE GALACTIC NUCLEUS 2XMM J123103.2+110648},
author = {Ho, Luis C. and Kim, Minjin and Terashima, Yuichi},
abstractNote = {Optical spectra and images taken with the Baade 6.5 m Magellan telescope confirm that 2XMM J123103.2+110648, a highly variable X-ray source with an unusually soft spectrum, is indeed associated with a type 2 (narrow-line) active nucleus at a redshift of z = 0.11871. The absence of broad H{alpha} or H{beta} emission in an otherwise X-ray unabsorbed source suggests that it intrinsically lacks a broad-line region. If, as in other active galaxies, the ionized gas and stars in J1231+1106 are in approximate virial equilibrium, and the M{sub BH} - {sigma}{sub *} relation holds, the exceptionally small velocity dispersion of {sigma} = 33.5 km s{sup -1} for [O III] {lambda}5007 implies that M{sub BH} Almost-Equal-To 10{sup 5} M{sub Sun }, among the lowest ever detected. Such a low black hole mass is consistent with the general characteristics of the host, a small, low-luminosity, low-mass disk galaxy. We estimate the Eddington ratio of the black hole to be {approx}>0.5, in good agreement with expectations based on the X-ray properties of the source.},
doi = {10.1088/2041-8205/759/1/L16},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}