Journal Article

GHASP: an Hα kinematic survey of spiral and irregular galaxies – IX. The near-infrared, stellar and baryonic Tully–Fisher relations*

S. Torres-Flores, B. Epinat, P. Amram, H. Plana and C. Mendes de Oliveira

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 416, issue 3, pages 1936-1948
Published in print September 2011 | ISSN: 0035-8711
Published online September 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19169.x
GHASP: an Hα kinematic survey of spiral and irregular galaxies – IX. The near-infrared, stellar and baryonic Tully–Fisher relations*

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We studied, for the first time, the near-infrared, stellar and baryonic Tully–Fisher relations for a sample of field galaxies taken from a homogeneous Fabry–Perot sample of galaxies [the Gassendi HAlpha survey of SPirals (GHASP) survey]. The main advantage of GHASP over other samples is that the maximum rotational velocities were estimated from 2D velocity fields, avoiding assumptions about the inclination and position angle of the galaxies. By combining these data with 2MASS photometry, optical colours, H i masses and different mass-to-light ratio estimators, we found a slope of 4.48 ± 0.38 and 3.64 ± 0.28 for the stellar and baryonic Tully–Fisher relation, respectively. We found that these values do not change significantly when different mass-to-light ratio recipes were used. We also point out, for the first time, that the rising rotation curves as well as asymmetric rotation curves show a larger dispersion in the Tully–Fisher relation than the flat ones or the symmetric ones. Using the baryonic mass and the optical radius of galaxies, we found that the surface baryonic mass density is almost constant for all the galaxies of this sample. In this study we also emphasize the presence of a break in the NIR Tully–Fisher relation at MH, K∼−20 and we confirm that late-type galaxies present higher total-to-baryonic mass ratios than early-type spirals, suggesting that supernova feedback is actually an important issue in late-type spirals. Due to the well-defined sample selection criteria and the homogeneity of the data analysis, the Tully–Fisher relation for GHASP galaxies can be used as a reference for the study of this relation in other environments and at higher redshifts.

Keywords: galaxies: evolution; galaxies: kinematics and dynamics

Journal Article.  10267 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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