Mass-to-light ratios of 2dF galaxies
Brainerd, Tereasa G.
Specian, Michael A.
MetadataShow full item record
CitationTG 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
Showing items related by title, author, creator and subject.
Probing the innermost regions of AGN jets and their magnetic fields with RadioAstron II. Observations of 3C 273 at minimum activity Bruni, G.; Gomez, J.L.; Casadio, C.; Lobanov, A.; Kovalev, Y.Y.; Sokolovsky, K.V.; Lisakov, M.M.; Bach, U.; Marscher, A.; Jorstad, S.; Anderson, J.M.; Krichbaum, T.P.; Savolainen, T.; Vega-Garcia, L.; Fuentes, A.; Zensus, J.A.; Alberdi, A.; Lee, S.-S.; Lu, R.-S.; Perez-Torres, M.; Ros, E. (EDP SCIENCES S A, 2017-08-01)CONTEXT. RadioAstron is a 10 m orbiting radio telescope mounted on the Spektr-R satellite, launched in 2011, performing Space Very Long Baseline Interferometry (SVLBI) observations supported by a global ground array of ...
Jorstad, Svetlana G.; Marscher, Alan P.; Morozova, Daria A.; Troitsky, Ivan S.; Agudo, Ivan; Casadio, Carolina; Foord, Adi; Gomez, Jose L.; MacDonald, Nicholas R.; Molina, Sol N.; Lahteenmaki, Anne; Tammi, Joni; Tornikoski, Merja (Institute of Physics Publishing Ltd, 2017-09-10)We analyze the parsec-scale jet kinematics from 2007 June to 2013 January of a sample of γ-ray bright blazars monitored roughly monthly with the Very Long Baseline Array at 43 GHz. In a total of 1929 images, we measure ...
Paltani, S.; Dwelly, T.; Walter, R.; Marscher, A. P.; Jorstad, S. G.; McHardy, I. M.; Courvoisier, T. J.-L. (American Institute of Physics, 2009-05)We present some results of the deepest extragalactic survey performed by the INTEGRAL satellite. The fraction of very absorbed AGN is quite large. The sharp decrease in the absorption fraction with X-ray luminosity observed ...