Mathematics
Scientific paper
Jan 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phdt.........1k&link_type=abstract
PhD Thesis, Combined Faculties for the Natural Sciences and for Mathematics of the University of Heidelberg, Germany. 167 pp. (2
Mathematics
Infrared Wide-Field Camera
Scientific paper
OMEGA2000 is a prime-focus, near-infrared, wide-field camera, mounted on the 3.5m telescope at Calar Alto. The camera uses a 2k×2k HAWAII-2 Focal plane array with a sensitivity from z to K band. In the first part of the thesis, we discuss the work aimed at optimizing the operation of the HAWAII-2 detector installed in the camera. We tested the operation of three speciemen from the HAWAII-2 family and compared their performances with each other. The MANOS Deep Field Survey, called COMBO-17+4 NIR, is planned to extend the results of the COMBO-17 project to higher redshifts by using this camera. The currently available data restricted the original project to the COMBO-17+2 NIR survey. In the second part of the thesis we discuss the results produced by COMBO-17+2 NIR. We present the redshift distribution of bright infrared galaxies observed in the COMBO S11 field and analyse the evolution of their number counts for four galaxy types defined by their restframe colors. We find a decline in the number of the old elliptical and evolved spiral galaxies at z>1.5, whereas the actively star-forming galaxies become the dominating population at z>1. This is in a broad agreement with earlier results. For Extremely Red Objects (EROs) in the COMBO S11 field selected with R-H<4, we measure similar redshift distribution and clustering signal to those derived in other surveys. Our ERO sample does not contain starburst galaxies, confirming the results of earlier observations. The total absence of the star-forming systems may also be attributed to the spectral template library used in the COMBO-17+2 NIR multi-color classification.
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