Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342429v&link_type=abstract
American Astronomical Society, AAS Meeting #213, #424.29; Bulletin of the American Astronomical Society, Vol. 41, p.251
Mathematics
Logic
Scientific paper
We present further results of a U-band study of the Ultra Deep Field (UDF) taken with Hubble's WFPC2/F300W probing the bright end of the U-band luminosity distribution (23.5 mag). We detect 94 objects which were identified in the GOODS catalog where B, V, i, z, spectral types and photometric redshifts are presented. We have also obtained UV detections of 26 sources with the Hubble ACS Solar Blind Channel (SBC) taken through the F150LP filter. The redshift distribution of the U-band sample peaks at zphot=0.7, and very few galaxies ( 13%) are detected at zphot > 1.3. We detect mostly objects with spectral types of starbursts (49%), late-types, and irregulars (47%). No early-types are detected. Only the most compact U-band objects have similar morphologies throughout their U, FUV (if detected), B, and BVi images. All other types appear significantly different in different bandpasses showing the need for multiwavelength data when evaluating properties of star-forming galaxies at intermediate-z. Using UDF morphological classifications described in Elmegreen et al. (2007) we find a lack of star-forming spirals and spheroidals at zphot > 1, clump clusters on the other hand are more common at this epoch. All U-band objects have sizes (half-light radii) ranging from 1-8kpc for 0.2 < zphot < 8kpc. We also measure the sizes of rest-frame UV clumps within 17 galaxies that might be super star-clusters at 0.62 < zphot < 1.5. We find 1-4 clumps in each of these objects ranging from 1.6-10.9kpc in diameter. This could be a sign of size evolution since these clumps are larger in size than those measured at higher redshifts in the rest-frame UV ( 1-2kpc, Elmegreen et al. 2007). We hope to increase our sample in the future in order to further study this trend.
de Mello Duilia F.
Gardner Jeffrey P.
Siana Brian
Teplitz Harry I.
Voyer Elysse
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