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Kang, Wol-Rang,Woo, Jong-Hak,Schulze, Andreas,Riechers, Dominik A.,Kim, Sang Chul,Park, Daeseong,Smolcic, Vernesa IOP Publishing 2013 The Astrophysical journal Vol.767 No.1
<P>To calibrate stellar velocity dispersion measurements from optical and near-IR stellar lines, and to improve the black hole mass (M-BH)-stellar velocity dispersion (sigma(*)) relation, we measure sigma(*) based on high-quality H-band spectra for a sample of 31 nearby galaxies, for which dynamical M-BH is available in the literature. By comparing velocity dispersions measured from stellar lines in the H-band with those measured from optical stellar lines, we find no significant difference, suggesting that optical and near-IR stellar lines represent the same kinematics and that dust effect is negligible for early-type galaxies. Based on the spatially resolved rotation and velocity dispersion measurements along the major axis of each galaxy, we find that a rotating stellar disk is present for 80% of galaxies in the sample. For galaxies with a rotation component, sigma(*) measured from a single aperture spectrum can vary by up to similar to 20%, depending on the size of the adopted extraction aperture. To correct for the rotational broadening, we derive luminosity-weighted sigma(*) within the effective radius of each galaxy, providing uniformly measured velocity dispersions to improve the M-BH-sigma(*) relation.</P>
DO QUIESCENT AND ACTIVE GALAXIES HAVE DIFFERENT<i>M</i><sub>BH</sub>-σ<sub>*</sub>RELATIONS?
Woo, Jong-Hak,Schulze, Andreas,Park, Daeseong,Kang, Wol-Rang,Kim, Sang Chul,Riechers, Dominik A. IOP Publishing 2013 The Astrophysical journal Vol.772 No.1
<P>To investigate the validity of the assumption that quiescent galaxies and active galaxies follow the same black hole mass (M-BH)-stellar velocity dispersion (sigma(*)) relation, as required for the calibration of M-BH estimators for broad line active galactic nuclei (AGNs), we determine and compare the M-BH-sigma(*) relations, respectively, for quiescent and active galaxies. For the quiescent galaxy sample, composed of 72 dynamical M-BH measurements, we update sigma(*) for 28 galaxies using homogeneous H-band measurements that are corrected for galaxy rotation. For active galaxies, we collect 25 reverberation-mapped AGNs and improve sigma(*) measurement for two objects. Combining the two samples, we determine the virial factor f, first by scaling the active galaxy sample to the M-BH-sigma(*) relation of quiescent galaxies, and second by simultaneously fitting the quiescent and active galaxy samples, as f = 5.1(-1.1)(+1.5) and f = 5.9(-1.5)(+2.1), respectively. The M-BH-sigma(*) relation of active galaxies appears to be shallower than that of quiescent galaxies. However, the discrepancy is caused by a difference in the accessible M-BH distribution at given sigma(*), primarily due to the difficulty of measuring reliable stellar velocity dispersion for the host galaxies of luminous AGNs. Accounting for the selection effects, we find that active and quiescent galaxies are consistent with following intrinsically the same M-BH-sigma(*) relation.</P>
An ALMA [C ii] Survey of 27 Quasars at<i>z</i>> 5.94
Decarli, Roberto,Walter, Fabian,Venemans, Bram P.,Bañ,ados, Eduardo,Bertoldi, Frank,Carilli, Chris,Fan, Xiaohui,Farina, Emanuele Paolo,Mazzucchelli, Chiara,Riechers, Dominik,Rix, Hans-Walter,Str American Astronomical Society 2018 The Astrophysical journal Vol.854 No.2
Dust Emission in an Accretion-rate-limited Sample of <i>z</i> ≳ 6 Quasars
Venemans, Bram P.,Decarli, Roberto,Walter, Fabian,Bañ,ados, Eduardo,Bertoldi, Frank,Fan, Xiaohui,Farina, Emanuele Paolo,Mazzucchelli, Chiara,Riechers, Dominik,Rix, Hans-Walter,Wang, Ran,Yang, Yu American Astronomical Society 2018 The Astrophysical journal Vol.866 No.2