Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424..578c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 424, no. 2, p. 578-598
Astronomy and Astrophysics
Astronomy
5
Astronomical Models, Computerized Simulation, Galactic Clusters, Galactic Evolution, Light (Visible Radiation), Mass Distribution, Monte Carlo Method, Near Infrared Radiation, Spatial Distribution, Astronomical Photometry, Correlation, Cosmology, Curve Fitting, Infrared Astronomy, Luminosity, Red Shift, Spectral Energy Distribution, Starburst Galaxies
Scientific paper
Monte Carlo simulations of three-dimensional galaxy distributions are performed, following the 1988 prescription of Chokshi & Wright, to study the photometric properties of evolving galaxy populations in the optical and near-infrared bands to high redshifts. In this paper, the first of a series, we present our baseline model in which galaxy numbers are conserved, and in which no explicit 'starburst' population is included. We use the model in an attempt to simultaneously fit published blue and near-infrared photometric and spectroscopic observations of deep fields. We find that our baseline models, with a formation redshift, zf, of 1000, and H0 = 50, are able to reproduce the blue counts to bj = 22, independent of the value of Omega0, and also to provide a satisfactory fit to the observed blue-band redshift distributions, but for no value of Omega0 do we achieve an acceptable fit to the fainter blue counts. In the K band, we fit the number counts to the limit of the present-day surveys only for an Omega0 = 0 cosmology. We investigate the effect on the model fits of varying the cosmological parameters H0, the formation red-shift zf, and the local luminosity function. Changing H0 does not improve the fits to the observations. However, reducing the epoch of a galaxy formation used in our simulations has a substantial effect. In particular, a model with zf approximately equal to 5 in a low Omega0 universe improves the fit to the faintest photometric blue data without any need to invoke a new population of galaxies, substantial merging, or a significant starburst galaxy population. For an Omega0 = 1 universe, however, reducing zf is less successful at fitting the blue-band counts and has little effect at all at K. Varying the parameters of the local luminosity function can also have a significant effect. In particular the steep low end slope of the local luminosity function of Franceschini et al. allows an acceptable fit to the bj less than or equal to 25 counts for Omega0 = 1, but is incompatible with Omega0 = 0.
Chokshi Arati
de Zotti Gianfranco
Lonsdale Carol J.
Mazzei Paola
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