The Space Density of Early Type Galaxies at 1 < z < 1.5 from the Las Campanas IR Survey

Details The Space Density of Early Type Galaxies at 1 < z < 1.5 from the Las Campanas IR Survey The Space Density of Early Type Galaxies at 1 < z < 1.5 from the Las Campanas IR Survey

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.7901m&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #79.01; Bulletin of the American Astronomical Society, Vol. 33, p.906

Astronomy and Astrophysics

Astronomy

Scientific paper

We report the results of an optical and near-IR survey over 0.7 square degrees at high latitudes. The number-magnitude relation for galaxies with I - H > 3 is very steep, rising from a few per square degree at H = 17 to more than 1000 per square degree at H = 20.5. The surface density of red objects drops by roughly a factor of 10 for each magnitude of redder colors between 3 < I - H < 5. We use photometric redshifts to estimate the characteristic redshift for this sample, and its redshift extent, to be = 1, σ (z) = 0.25. From this we deduce a space density of luminous red galaxies of 3 x 10-3 h-3 Mpc-3. This is somewhat less than that expected from passive evolution but roughly equal to the present day value. If these are massive early-type galaxies their space density exceeds the expectations based on hierarchical clustering models. This research was supported by the National Science Foundation under grant AST-9900806. The CIRSI camera was made possible by the generous support of the Raymond and Beverly Sackler Foundation.

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