The Axis Ratio Distribution of Local and Distant Galaxies

Details The Axis Ratio Distribution of Local and Distant Galaxies The Axis Ratio Distribution of Local and Distant Galaxies

1997-09-09

arxiv.org/abs/astro-ph/9709069v1

Astronomy and Astrophysics

Astrophysics

LaTex, 35 pages, 8 figures, accepted for Dec97 AJ

Scientific paper

10.1086/118642

Surface photometry from 16 HST/WFPC2 fields in the I(F814W) filter is used to derive the distribution of apparent axis ratios for galaxies in progressively fainter magnitude intervals for I<25. We assess the systematic and accidental errors in ellipticity measurements as a function of image resolution and signal-to-noise ratio, and statistically correct for the effect of cosmological surface brightness dimming on our isophotal measurements. The axis ratio distribution for the local galaxy population was computed using logR measurements for 1569 RC3 galaxies with Bt<13 mag. Nonparametric tests are used to show that our distant samples, in the redshift range 0.1

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