AAS 204th Meeting, June 2004
Session 43 Galaxy Surveys and Galaxy Clusters
Poster, Tuesday, June 1, 2004, 10:00am-7:00pm, Ballroom

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[43.07] Relating Morphological and Spectroscopic Properties of Galaxies in the GRAPES / Hubble Ultra Deep Field

N. Pirzkal, S. Malhotra, J. Rhoads, C. Xu (STScI), A. Pasquali (Institute of Astronomy, Zurich), GRAPES Team

We present a morphological analysis of selected sources in the Hubble Ultra Deep Field for which we have redshifts from emission lines or spectral breaks in the deep GRAPES ACS spectroscopic observations of this field. The GRAPES spectra are sensitive to wavelengths ranging from 5500Å to 10500Å. These spectra (supplemented by broad band colors) have allowed us to determine the redshifts of [OII], [OIII], and H alpha emitters at 0 < z < 1.7, and of Lyman Alpha emitters at 4 < z < 7. Many of the objects in the UDF have a complex structure. Several objects that appeared unresolved in the shallower GOODS observations now have distinct extended components. We quantitatively examine the relations between emission line equivalent widths, redshifts, star formation rates, and morphologies of these objects. To enable this quantitative study, we measured the classic CAS parameters (asymmetry, concentration, clumpiness), the Gini coefficient, and also fitted parametric morphology models to the innermost and extended components.

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Bulletin of the American Astronomical Society, 36 #2
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