Do Young Galaxies Grow Inside-Out? The Deepest Probe of this Open Question Using New WFC3 Images of the Ultra Deep Field from HST

Details Do Young Galaxies Grow Inside-Out? The Deepest Probe of this Open Question Using New WFC3 Images of the Ultra Deep Field from HST Do Young Galaxies Grow Inside-Out? The Deepest Probe of this Open Question Using New WFC3 Images of the Ultra Deep Field from HST

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21533804m&link_type=abstract

American Astronomical Society, AAS Meeting #215, #338.04; Bulletin of the American Astronomical Society, Vol. 42, p.442

Astronomy and Astrophysics

Astronomy

Scientific paper

The recent release of the deepest (limiting magnitudes 29 AB mag) WFC3 images of the UDF provides an exciting new opportunity for studying galaxy structure at z 1-3. Previously, the highest spatial resolution data of distant galaxies were limited to the visible wavelength bands of ACS from HST. These optical wavebands shift to rest-frame UV bands (at z 1-3), which trace young stellar populations. In order to probe the mature stellar populations in galaxies, rest-frame optical to NIR bands are needed. WFC3's Y, J, and H filters allow us to observe rest-frame optical and NIR wavelengths at high redshifts with high spatial resolution and thus study a galaxy's structure, formation history, and formation mechanism in terms of its underlying stellar mass and not just its most luminous young stars. Using the galaxy fitting package GIM2D, we measure the sizes and Sersic profiles of 150 distant galaxies (z 1-3) in the UDF in ACS (bviz) and WFC3 (Y, J, H) bands. We present the deepest measurements of the radial gradient of young versus old stars of these distant galaxies and compare them to local galaxies to track inside-out galaxy growth and their evolution.

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