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• W3099474433 endingPage "L16" @default.
• W3099474433 startingPage "L16" @default.
• W3099474433 abstract "Optical spectra and images taken with the Baade 6.5 meter 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 Halpha or Hbeta 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 black hole mass versus stellar velocity dispersion relation holds, the exceptionally small velocity dispersion of 33.5 km/s for [O III] 5007 implies that the black hole mass is approximately 10^5 solar masses, 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 > 0.5, in good agreement with expectations based on the X-ray properties of the source." @default.
• W3099474433 created "2020-11-23" @default.
• W3099474433 creator A5046730991 @default.
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• W3099474433 date "2012-10-15" @default.
• W3099474433 modified "2023-10-01" @default.
• W3099474433 title "THE LOW-MASS, HIGHLY ACCRETING BLACK HOLE ASSOCIATED WITH THE ACTIVE GALACTIC NUCLEUS 2XMM J123103.2+110648" @default.
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• W3099474433 doi "https://doi.org/10.1088/2041-8205/759/1/l16" @default.
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