Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19711702r&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #117.02; Bulletin of the American Astronomical Society, Vol. 32, p.1602
Astronomy and Astrophysics
Astronomy
Scientific paper
Recent searches for high redshift galaxies select them on the basis of strong breaks in their rest-frame UV spectral energy distribution (SED). The success of these searches has made possible, for the first time, the measurement of the instantaneous star-formation rate (SFR) of the universe. However the rest-frame V-band is shifted into the near infrared by z=0.5, and so these same optical surveys are not sensitive to the light from the stars which dominate the stellar mass budget. To more directly measure the stellar mass build-up of the universe, we have obtained deep JHKs images ( ~ 32 hours per passband) of the Hubble Deep Field South (HDF-S) as part of the the Faint InfraRed Extra-galactic Survey (FIRES) at the VLT. We couple this with the deep, optical HST WFPC2 data from this same field. We select galaxies in the K-band and hence, out to z=3, by their rest-frame optical light. Using the seven-band information from the HST + VLT data, we obtain photometric redshifts of all galaxies in a magnitude limited, K-band selected catalog. Once the redshift is measured, we can use the observed colors to constrain the intrinsic SED. We measure the rest-frame V-band luminosity of all of the galaxies in our sample and find a large number of bright galaxies with LV > LV* and 1< z < 3. Some of these bright galaxies have strong Balmer Breaks or 4000Å breaks indicating the presence of evolved stellar populations. A preliminary analysis shows that these evolved, luminous galaxies contribute comparably to the stellar mass budget at these redshifts as the Lyman Break Galaxies. This work is supported by the Max-Plank-Institut für Astronomie.
Franx Marijn
Rix Hans-Walter
Rudnick Gregory
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