2001MNRAS.325..335F

Query : 2001MNRAS.325..335F

2001MNRAS.325..335F - Mon. Not. R. Astron. Soc., 325, 335-342 (2001/July-3)

The cosmological evolution of colour gradients in spheroids.

FRIACA A.C.S. and TERLEVICH R.J.

Abstract (from CDS):

The analysis of the four-colour maps of galaxies in the Hubble Deep Field (HDF) has revealed, in the sample of 0.4<z<1 early-type field galaxies, the existence of ellipticals with a predominantly old coeval stellar population. However, there is another, unexpected, category of HDF early-type galaxies, in which the galaxy core is significantly bluer than the outer regions. We demonstrate that these colour gradients are predicted by the multizone chemodynamical model for the evolution of elliptical galaxies.

We suggest that the colour gradient could be used as a chronometer for the evolution of elliptical galaxies: galaxies younger than a few Gyr exhibit cores bluer than the surrounding galaxy as a result of ongoing star formation, while more evolved galaxies have redder cores because of metallicity gradients increasing toward the centre.


Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: formation - galaxies: ISM - galaxies: starburst - cosmology: observations

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Cowie 37 EmG 12 36 49.3710 +62 13 11.597 24.15 23.5938 23.185 21.97 22.2066 ~ 43 0
2 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1967 1

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