Statistics – Computation
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...403..552y&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 403, no. 2, p. 552-566.
Statistics
Computation
65
Faint Objects, Galactic Evolution, Galactic Structure, Red Shift, Astronomical Models, Brightness Distribution, Computational Astrophysics, Luminosity, Point Spread Functions
Scientific paper
A method is presented for modeling a galaxy number count and redshift distribution in the faint limit of recent ultradeep galaxy surveys. In this method, a detection and magnitude-measurement algorithm is applied in the theoretical framework, to minimize uncertainties of the corrections usually applied to the raw count of detected galaxies and to extract a meaningful cosmological information from these data. A hypothesis of galaxy evolution in diameter and/or number is tested against faint observations. It is found that the central surface brightness vs. apparent magnitude relation is sensitive only to a change of intrinsic size of galaxies, so that the relation can be used as a probe of the galactic diameter evolution. Comparisons between predicted and observed relations indicate that the bulk of galaxies have undergone little diameter evolution over a considerable fraction of their age.
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