TY - JOUR
T1 - SDSS J085431.18+173730.5
T2 - The FIRST COMPACT ELLIPTICAL GALAXY HOSTING AN ACTIVE NUCLEUS
AU - Paudel, Sanjaya
AU - Hilker, Michael
AU - Ree, Change Hee
AU - Kim, Minjin
N1 - Publisher Copyright:
© 2016. The American Astronomical Society. All rights reserved..
PY - 2016/3/20
Y1 - 2016/3/20
N2 - We report the discovery of a rare compact early-type galaxy, SDSS J085431.18+173730.5 (hereafter cE-AGN). It has a half-light radius of Re =490 pc and a brightness of Mr =-18.08 mag. Optical spectroscopy available from the Sloan Digital Sky Survey (SDSS) reveals the presence of prominent broad-line emissions with the Hα broad component width of FWHM =2400 km s-1. The black hole (BH) mass, as estimated from the luminosity and width of the broad Hα emission, is 2.1x106. With the help of surface photometry, we perform a detailed analysis of the structural properties. The observed light distribution is best modeled with a double Sérsic function. Fixing the outer component as an exponential disk, we find that the inner component has a Sérsic index of n =1.4. Considering the inner component as bulge/spheroidal we find that cE-AGN remains consistent in both the BH mass-bulge mass relation and the BH mass-bulge Sérsic index relation. Given these observational properties, we discuss its possible origin investigating the surrounding environment where it is located.
AB - We report the discovery of a rare compact early-type galaxy, SDSS J085431.18+173730.5 (hereafter cE-AGN). It has a half-light radius of Re =490 pc and a brightness of Mr =-18.08 mag. Optical spectroscopy available from the Sloan Digital Sky Survey (SDSS) reveals the presence of prominent broad-line emissions with the Hα broad component width of FWHM =2400 km s-1. The black hole (BH) mass, as estimated from the luminosity and width of the broad Hα emission, is 2.1x106. With the help of surface photometry, we perform a detailed analysis of the structural properties. The observed light distribution is best modeled with a double Sérsic function. Fixing the outer component as an exponential disk, we find that the inner component has a Sérsic index of n =1.4. Considering the inner component as bulge/spheroidal we find that cE-AGN remains consistent in both the BH mass-bulge mass relation and the BH mass-bulge Sérsic index relation. Given these observational properties, we discuss its possible origin investigating the surrounding environment where it is located.
KW - galaxies: active
KW - galaxies: bulges
KW - galaxies: dwarf
KW - galaxies: elliptical and lenticular, cD
KW - galaxies: individual (SDSS J085431.18+173730.5)
KW - galaxies: stellar content
UR - http://www.scopus.com/inward/record.url?scp=84962318748&partnerID=8YFLogxK
U2 - 10.3847/2041-8205/820/1/L19
DO - 10.3847/2041-8205/820/1/L19
M3 - Article
AN - SCOPUS:84962318748
SN - 2041-8205
VL - 820
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L19
ER -