Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541007p&link_type=abstract
American Astronomical Society, AAS Meeting #215, #410.07; Bulletin of the American Astronomical Society, Vol. 42, p.235
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a multiwavelength study of high-z galaxies at z 1.5 and 4, using Hubble Space Telescope optical (ACS), near-infrared (NICMOS), and mid-infrared images (Spitzer/IRAC). The morphologies of detected objects are categorized quantitatively by the Gini coefficient, M20, and the 2D Sersic index. A catalog of sources has been created and cross-matched between the multiple wavelengths. The data includes the ACS filters F606W and 850LP; NICMOS filters F110W, and F160W; and IRAC 3.6, 4.5, 5.8 and 8.0 μm filters. The galaxies are extracted from the NICMOS parallel pointings as part of the UDF05 campaign. We use the Balmer-break to fit SEDs for 301 galaxies and obtain photometric redshifts, dust extinction, starburst age, bolometric luminosities, and metallicities. We measure G, M20, and Sérsic for a selection of the SED fitted data in the redshift regions 1.3 < z < 2 and 3 < z < 4. The quantitative morphologies are compared in the F606W, F850LP, F110W, and F160W images and are compared with a sample of LBGs at z 1.5 and 4. We compare the morphologies with the SED derived physical parameters. One major result shows that the luminosities are 16 times brighter for galaxies at z 4. Our purpose is to determine trends in morphologies as a function of redshift and physical parameters for Balmer-break selected galaxies which have older stellar populations than LBGs.
de Mello Duilia F.
Gardner Jeffrey P.
Petty Sara M.
Wiklind Thomas
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