IRAS 10214 + 4724 - an elliptical galaxy in formation?

Details IRAS 10214 + 4724 - an elliptical galaxy in formation? IRAS 10214 + 4724 - an elliptical galaxy in formation?

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265l..29e&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 2, p. L29-L32.

Astronomy and Astrophysics

Astronomy

23

Elliptical Galaxies, Galactic Evolution, Star Formation, Astronomical Models, Infrared Astronomy Satellite, Interstellar Matter, Mass To Light Ratios, Metallicity, Supernovae

Scientific paper

We present here a quantitative model of the ultrabright object IRAS 10214 + 4724 (z = 2.286) where this object is described as a primeval elliptical galaxy in intense star formation phase. As observational constraints we use the total luminosity and the luminosity over gas mass ratio deduced from the observed submm to IR luminosity and CO emission. These main features are reproduced by a model of galactic evolution with bimodal star formation for a 3 x 10 exp 7 yr old galaxy of about 3 x 10 exp 11 solar masses, with a star formation rate of 6000 solar masses/yr. Despite this early age, we show that the metallicity is higher than solar and the mass of heavy elements is consistent with the dust mass estimated by Downes et al. We also consider and discuss a standard burst model that we compare to the bimodal model. In addition, we show that the high rate of SNII in our model entails a high Fe production and is likely to drive a superwind. If 10214 + 4724 represented a generic phase in the evolution of ellipticals, this would explain the observed iron enrichment in the intra-cluster medium.

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