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Calibrating Stellar Velocity Dispersions Based on Spatially Resolved H-band Spectra for Improving the M_(BH)-σ_* Relation

Kang, Wol-Rang and Woo, Jong-Hak and Schulze, Andreas and Riechers, Dominik A. and Kim, Sang Chul and Park, Daeseong and Smolčić, Vernesa (2013) Calibrating Stellar Velocity Dispersions Based on Spatially Resolved H-band Spectra for Improving the M_(BH)-σ_* Relation. Astrophysical Journal, 767 (1). Art. No. 26. ISSN 0004-637X. doi:10.1088/0004-637X/767/1/26. https://resolver.caltech.edu/CaltechAUTHORS:20130503-104250488

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Abstract

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 (σ_*) relation, we measure σ_* 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, σ_* measured from a single aperture spectrum can vary by up to ~20%, depending on the size of the adopted extraction aperture. To correct for the rotational broadening, we derive luminosity-weighted σ_* within the effective radius of each galaxy, providing uniformly measured velocity dispersions to improve the M_(BH)-σ_* relation.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/767/1/26DOIArticle
http://iopscience.iop.org/0004-637X/767/1/26/PublisherArticle
ORCID:
AuthorORCID
Riechers, Dominik A.0000-0001-9585-1462
Smolčić, Vernesa0000-0002-3893-8614
Additional Information:© 2013 American Astronomical Society. Received 2013 January 20; accepted 2013 February 19; published 2013 March 21. We thank the anonymous referee for constructive suggestions, which improved the manuscript. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2012-006087). J.H.W. acknowledges the support by the Korea Astronomy and Space Science Institute (KASI) grant funded by the Korea government (MEST).
Funders:
Funding AgencyGrant Number
National Research Foundation of Korea2012-006087
Ministry of Education, Science and Technology (Korea)UNSPECIFIED
Korea Astronomy and Space Science Institute (KASI)UNSPECIFIED
Subject Keywords:galaxies: bulges; galaxies: kinematics and dynamics; infrared: galaxies; techniques: spectroscopic
Issue or Number:1
DOI:10.1088/0004-637X/767/1/26
Record Number:CaltechAUTHORS:20130503-104250488
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130503-104250488
Official Citation:Calibrating Stellar Velocity Dispersions Based on Spatially Resolved H-band Spectra for Improving the M BH-σ* Relation Wol-Rang Kang et al. 2013 ApJ 767 26
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38261
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:03 May 2013 18:10
Last Modified:09 Nov 2021 23:36

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