The 6dF Galaxy Survey: Stellar Population Trends Across and Through the Fundamental Plane - INSPIRE

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The 6dF Galaxy Survey: Stellar Population Trends Across and Through the Fundamental Plane

Oct, 2011

13 pages

Published in:

Mon.Not.Roy.Astron.Soc. 420 (2012) 2773

e-Print:

1110.1916 [astro-ph.CO]

DOI:

10.1111/j.1365-2966.2011.19900.x

View in:

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Abstract: (arXiv)

We present results from an analysis of stellar population parameters for 7132 galaxies in the 6dFGS Fundamental Plane (FP) sample. We bin the galaxies along the axes,

v_1

,

v_2

, and

v_3

, of the tri-variate Gaussian to which we have fit the galaxy distribution in effective radius, surface brightness, and central velocity dispersion (FP space), and compute median values of stellar age, [Fe/H], [Z/H], and [

\alpha

/Fe]. We determine the directions of the vectors in FP space along which each of the binned stellar population parameters vary most strongly. In contrast to previous work, we find stellar population trends not just with velocity dispersion and FP residual, but with radius and surface brightness as well. The most remarkable finding is that the stellar population parameters vary through the plane (

v_1

direction) and across the plane (

v_3

direction), but show no variation at all along the plane (

v_2

direction). The

v_2

direction in FP space roughly corresponds to `luminosity density'. We interpret a galaxy's position along this vector as being closely tied to its merger history, such that early-type galaxies with lower luminosity density are more likely to have undergone major mergers. This conclusion is reinforced by an examination of the simulations of Kobayashi (2005), which show clear trends of merger history with

v_2

.

Note:

13 pages, 14 figures, accepted for publication in MNRAS. A version of this paper with fully interactive 3D figures, viewable with Adobe Reader 8.0 or higher, is available as an ancillary file with this release, and can also be accessed from <a href="http://www.aao.gov.au/local/www/6df/Publications/REFEREED/6dFGS_SP_3D.pdf">this link</a>

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