2013ApJ...770....3J -
Astrophys. J., 770, 3 (2013/June-2)
UM 625 revisited: multiwavelength study of a Seyfert 1 galaxy with a low-mass black hole.
JIANG N., HO L.C., DONG X.-B., YANG H. and WANG J.
Abstract (from CDS):
UM 625, previously identified as a narrow-line active galactic nucleus (AGN), actually exhibits broad Hα and Hβ lines whose width and luminosity indicate a low black hole (BH) mass of 1.6x106 M☉. We present a detailed multiwavelength study of the nuclear and host galaxy properties of UM 625. Analysis of Chandra and XMM-Newton observations suggests that this system contains a heavily absorbed and intrinsically X-ray weak (αox= -1.72) nucleus. Although not strong enough to qualify as radio loud, UM 625 does belong to a minority of low-mass AGNs detected in the radio. The broadband spectral energy distribution constrains the bolometric luminosity to Lbol~ (0.5-3)x1043 erg/s and Lbol/LEdd~ 0.02-0.15. A comprehensive analysis of Sloan Digital Sky Survey and Hubble Space Telescope images shows that UM 625 is a nearly face-on S0 galaxy with a prominent, relatively blue pseudobulge (Sérsic index n = 1.60) that accounts for ∼60% of the total light in the R band. The extended disk is featureless, but the central ∼150-400 pc contains a conspicuous semi-ring of bright, blue star-forming knots, whose integrated ultraviolet luminosity suggests a star formation rate of ∼0.3 M☉/yr. The mass of the central BH roughly agrees with the value predicted from its bulge velocity dispersion but is significantly lower than that expected from its bulge luminosity.
Abstract Copyright:
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Journal keyword(s):
galaxies: active - galaxies: individual: UM 625 - galaxies: nuclei - galaxies: Seyfert - X-rays: galaxies
Simbad objects:
5
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