Computer Science – Performance
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998esoc...55..181m&link_type=abstract
NICMOS and the VLT: A New Era of High Resolution Near Infrared Imaging and Spectroscopy, Pula, Sardinia, Italy, June 26-27th 199
Computer Science
Performance
Scientific paper
We present results from our analysis of F160W images obtained with NICMOS Camera 3 operating in the parallel mode. Despite the less than optimal focus, we achieve depths that are very close to the nominal performance. With exposure times of 2,000 to 13,000 seconds we reach 3 sigma depths of H = 24.3 - 25.5. We derive the galaxy number counts in an area of roughly 9 square arc-minutes. The slope of the counts fainter than H~= 20 is 0.31, and the integrated surface density to H < 24.75 is 4 x 10^5 galaxies per square degree. We transform the deepest K-band counts to our system and find good agreement. At H = 24.5 the observed surface density is roughly twice that predicted by non-evolving models. The half-light radii of the galaxies declines steeply with apparent magnitude and reaches our resolution limit of 0".20 at H = 23.5. Deep ground-based VRI imaging of one NICMOS field has revealed a very red galaxy with H = 18.8 and R - H = 6.
McCarthy Patrick
Storrie-Lombardi Lisa
Weymann Ray J.
Yan Lihong
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