The Lyman-Break Galaxy Size-Redshift Relation

Details The Lyman-Break Galaxy Size-Redshift Relation The Lyman-Break Galaxy Size-Redshift Relation

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.1704f&link_type=abstract

American Astronomical Society Meeting 202, #17.04; Bulletin of the American Astronomical Society, Vol. 35, p.723

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Hubble Space Telescope ACS images of color-selected high-redshift galaxies are used to examine the size and axial-ratio distribution of galaxies at lookback times t > 10 Gyr. Observations consist of images taken in the F435W (B), F606W (V), F775W (i) , and F850LP (z) filters to depths of roughly AB = 26 mag in the z band. The images have a resolution of approximately 0.1 arcsec, providing a resolution better than 1 kpc at any redshift for cosmological parameters consistent with the WMAP results. The galaxies are observed to have roughly constant angular half-light radii from redshifts z ˜ 2.5 to z ˜ 5, implying that the physical sizes decrease toward higher redshift, as expected from hierarchical models. The distribution of axial ratios indicates that Lyman-break galaxies at z=3 and z=4 are, on average, spheroidal systems rather than flat disks.

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