A filter for deep near-infrared imaging

Details A filter for deep near-infrared imaging A filter for deep near-infrared imaging

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..332w&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, Jan. 1992, p. 332-337.

Astronomy and Astrophysics

Astronomy

245

Astronomical Photometry, Image Filters, Image Processing, Near Infrared Radiation, Atmospheric Windows, Background Radiation, Extremely High Frequencies, Signal To Noise Ratios

Scientific paper

The K passband (central wavelength 2.2 microns, FWHM 0.4 micron) is the longest wavelength standard near-IR passband through which deep ground-based imaging is possible. Thermal emission from telescope, instrument, and sky limits the depth to which such imaging can reach by producing strongly temperature-dependent backgrounds in the range 11-13.5 mag/sq arcsec. This paper describes how a passband, which is denoted as K-prime, located slightly shortward of the standard K passband (central wavelength 2.1 microns), yet still within the same atmospheric window, leads to a significantly lower thermal component of the background, reducing the background surface brightness by up to 0.9 mag sq arcsec, and thereby allowing deeper imaging to be obtained in the same integration time. The photometric differences between the K-prime filter and the standard K filter are discussed.

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