Papers

Optical-to-virial velocity ratios of local disc galaxies from combined kinematics and galaxy–galaxy lensing

  1. R. Reyes1,2,*,
  2. R. Mandelbaum1,3,
  3. J. E. Gunn1,
  4. R. Nakajima4,5,6,7,
  5. U. Seljak5,6,7,8,
  6. C. M. Hirata9

Article first published online: 31 AUG 2012

DOI: 10.1111/j.1365-2966.2012.21472.x

Issue

Monthly Notices of the Royal Astronomical Society

Monthly Notices of the Royal Astronomical Society

Volume 425, Issue 4, pages 2610–2640, 1 October 2012

Additional Information

How to Cite

Reyes, R., Mandelbaum, R., Gunn, J. E., Nakajima, R., Seljak, U. and Hirata, C. M. (2012), Optical-to-virial velocity ratios of local disc galaxies from combined kinematics and galaxy–galaxy lensing. Monthly Notices of the Royal Astronomical Society, 425: 2610–2640. doi: 10.1111/j.1365-2966.2012.21472.x

Author Information

  1. 1

    Peyton Hall Observatory, Princeton University, Princeton, NJ, USA

  2. 2

    Kavli Institute for Cosmological Physics and Enrico Fermi Institute, The University of Chicago, Chicago, IL, USA

  3. 3

    Department of Physics, Carnegie Mellon University, Pittsburgh, PA, USA

  4. 4

    Argelander-Institut für Astronomie, Universität Bonn, Bonn, Germany

  5. 5

    Space Sciences Lab, Department of Physics and Department of Astronomy, University of California, Berkeley, CA, USA

  6. 6

    Lawrence Berkeley National Lab, University of California, Berkeley, CA, USA

  7. 7

    Institute of the Early Universe, Ewha Womans University, Seoul, Korea

  8. 8

    Institute for Theoretical Physics, University of Zurich, Zurich, Switzerland

  9. 9

    Department of Astronomy, Pasadena, CA, USA

*E-mail: rreyes@kicp.uchicago.edu

Publication History

  1. Issue published online: 30 AUG 2012
  2. Article first published online: 31 AUG 2012
  3. Manuscript Accepted: 7 JUN 2012
  4. Manuscript Received: 7 JUN 2012

Funded by

  • US Department of Energy. Grant Number: DE-FG03-02-ER40701
  • David & Lucile Packard Foundation

SEARCH

SEARCH BY CITATION

ARTICLE TOOLS

View Full Article (HTML) Get PDF (2603K)

Keywords:

  • gravitational lensing: weak;
  • galaxies: kinematics and dynamics;
  • galaxies: spiral

ABSTRACT

In this paper, we measure the optical-to-virial velocity ratios Vopt/V200c of disc galaxies in the Sloan Digital Sky Survey (SDSS) at a mean redshift of 〈z〉 = 0.07 and with stellar masses 109 < M* < 1011 M⊙. Vopt/V200c, the ratio of the circular velocity measured at the optical radius of the disc (∼10 kpc) to that at the virial radius of the dark matter halo (∼150 kpc), is a powerful observational constraint on disc galaxy formation. It links galaxies to their dark matter haloes dynamically and constrains the total mass profile of disc galaxies over an order of magnitude in length scale. For this measurement, we combine Vopt derived from the Tully–Fisher relation (TFR) from Reyes et al. with V200c derived from halo masses measured with galaxy–galaxy lensing. In anticipation of this combination, we use similarly selected galaxy samples for both the TFR and lensing analysis. For three M* bins with lensing-weighted mean stellar masses of 0.6, 2.7 and 6.5 × 1010 M⊙, we find halo-to-stellar mass ratios M200c/M* = 41, 23 and 26, with 1σ statistical uncertainties of around 0.1 dex, and Vopt/V200c = 1.27 ± 0.08, 1.39 ± 0.06 and 1.27 ± 0.08 (1σ), respectively. Our results suggest that the dark matter and baryonic contributions to the mass within the optical radius are comparable, if the dark matter halo profile has not been significantly modified by baryons. The results obtained in this work will serve as inputs to and constraints on disc galaxy formation models, which will be explored in future work. Finally, we note that this paper presents a new and improved galaxy shape catalogue for weak lensing that covers the full SDSS Data Release 7 footprint.

View Full Article (HTML) Get PDF (2603K)