The Physical Parameters Underlying the Sequence of Early-Type Galaxies

Details The Physical Parameters Underlying the Sequence of Early-Type Galaxies The Physical Parameters Underlying the Sequence of Early-Type Galaxies

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.5101p&link_type=abstract

American Astronomical Society, 192nd AAS Meeting, #51.01; Bulletin of the American Astronomical Society, Vol. 30, p.888

Astronomy and Astrophysics

Astronomy

Scientific paper

The physical parameters varying along the sequence of early-type galaxies are explored using the Fundamental Plane (FP) correlations in the local universe and in distant clusters. The nearby galaxy samples in the UBVRIK bandpasses are drawn from a new survey (Pahre 1998) and the literature. A distant-independent parameterization of Delta ( log r_eff - 0.32 < mu >_eff ) against log sigma_0 shows that the slope A of the FP relation r_eff ~ sigma_0 (A) < Sigma >_eff(B) increases systematically with wavelength from U to K. A model is constructed to describe this variation of the FP slope, the slope of the Mg_2--sigma_0 relation, and the effects of stellar populations gradients. This model shows that there are systematic variations of up to a factor of three in age and metallicity along the full range of the early-type galaxy sequence (in the sense that the most luminous galaxies are the oldest and the most metal rich), and that a wavelength-independent effect (such as dynamical homology breaking or systematic variations in dark matter content) is required. This model predicts that the slope of the FP evolves: the power-law index A should decrease with redshift. A large sample of > 100 early-type galaxies in six clusters at 0.1

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