Mass-to-light ratios of 2dF galaxies
Brainerd, Tereasa G.
Specian, Michael A.
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Citation (published version)TG Brainerd, MA Specian. 2003. "Mass-to-light ratios of 2dF galaxies." ASTROPHYSICAL JOURNAL, Volume 593, Issue 1, pp. L7 - L10 (4).
We compute Mimg1.gif, the dynamical mass interior to a radius of 260 h-1 kpc, for a set of 809 isolated host galaxies in the 100k data release of the 2dF Galaxy Redshift Survey. The hosts are surrounded by 1556 fainter satellite galaxies. Our mass estimator and host/satellite selection criteria are taken from those used by the Sloan Digital Sky Survey collaboration for a similar analysis of Mimg1.gif, and overall our results compare well with theirs. In particular, for L gsim 2L*, we find (Mimg1.gif/L)img2.gif = 193 ± 14 h M☉/L☉, with a weak tendency for hosts with L < 2L* to have a somewhat higher M/L. Additionally, we investigate M/L for bright (bJ lesssim 18) galaxies with elliptical, S0, and spiral morphologies. There are 159 hosts in the elliptical/S0 sample; similar to the full sample, (Mimg1.gif/L)img2.gif = 271 ± 26 h M☉/L☉ for galaxies with L gsim 2L*. There is a weak tendency for less luminous galaxies to have a somewhat higher M/L. In stark contrast to this, the line-of-sight velocity dispersion for the 243 spiral hosts is independent of the host luminosity, with a value of σv = 189 ± 19 km s-1. Thus, for spiral hosts, we find (Mimg1.gif/L)img2.gif ∝ L-1.0±0.2, where (Mimg1.gif/L)img2.gif for a 2L* spiral galaxy is of order 200 h M☉/L☉.
Rights© 2003 American Astronomical Society
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