Other
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.1011b&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #10.11; Bulletin of the American Astronomical Society, Vol. 26, p.1323
Other
1
Scientific paper
The Wyoming Infrared Observatory (WIRO) prime-focus, near-infrared camera (nicknamed ``Babe'' after the famous ox of the same color) was designed specifically for wide-field imaging between 1 to 2.5 microns. To achieve the wide field-of-view, we mount the camera at the prime focus of the WIRO 2.3-meter telescope, a configuration which provides the camera with a total square field-of-view of 2stackrel {('}}{_{.}) 08 x 2stackrel {('}}{_{.}) 08. Since achieving first light in the summer of 1989, several scientific papers have been published based upon galaxy images obtained with this camera (for instance, Barnaby & Thronson 1994). The design and construction of the camera have been covered by Spillar et (1990), however the photometric accuracy and repeatability of this camera have not been described before now. In this paper, we show photometry obtained with the camera of calibration stars with near-infrared magnitudes ranging from 7() m to 14() m. These measurements indicate that over this range in brightness, the zero-point magnitude shifts about +0.06() m while the relative uncertainty increases from 0.03() m to 0.1() m. In addition to photometry of calibration stars, we report on data comparing Babe near-infrared photometry of the galaxy M51 to photometry obtained by authors using other near-infrared aperture photometers and cameras. This comparison shows our photometry is consistent to within 0.1() m with these other measurements down to a surface brightness of 18() m arcsec(-2) . These data, then, indicate that we can use our camera to measure near-infrared surface brightness of galaxies with a relative uncertainty of about 0.1() m and a systematic uncertainty of about 0.1() m. This work was supported by NSF through grant AST-9117096 and EPSCoR grant RII-8610680 and by a Theodore Dunham, Jr. Grant from the Fund for Astrophysical Research.
Barnaby David
Johnson Paul E.
Spillar Earl J.
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