ISSTT Proceedings

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Development of a Large Format Fully Sampled Bolometer Camera for 2 mm Wavelength

Authors:
Dominic J. Benford, Johannes G. Staguhn, Christine A. Allen, Troy J. Ames, Ernest D. Buchanan, Stephen F. Maher, S. Harvey Moseley, Elmer H. Sharp, Edward J. Wollack
Abstract:
The 2 mm (150 GHz) atmospheric window enables unparalleled ground-based observations of the earliest active dusty galaxies in the universe. We have undertaken the development of a bolometer camera, GISMO (the Goddard-IRAM Superconducting 2-Millimeter Observer), which will obtain large and sensitive sky maps at this wavelength. The instrument will be used at the IRAM 30 m telescope, where we hope to have a trial observing run in Summer 2007. The innovative element in this camera is its 8[]-[]16 fully sampled planar array of multiplexed superconducting transition edge sensor bolometers. This array is based on our recently demonstrated Backshort Under Grid architecture, designed to be scaled to kilopixel arrays with high sensitivity (of around 4×10-17 W/square rootHz at TC~450 mK). A compact cryogenic optical system provides a wide field of view of almost 2'[]-[]4', enabling GISMO to be very efficient at detecting sources serendipitously in large sky surveys, while retaining diffraction-limited imaging performance. GISMO will provide significantly greater imaging sensitivity and mapping speed at this wavelength than has previously been possible. The major scientific driver for the instrument is to detect dust emission from high-z ULIRGs and quasars. The instrument provides an important portion of the spectrum of high redshift galaxies at the Rayleigh-Jeans part of the dust emission spectrum, even at the highest redshifts. Models of galaxy evolution predict that GISMO will serendipitously detect one galaxy in every four hours of observing blank sky, and that one quarter of these galaxies will be at a redshift of z > 6.5.
Categories:
Detectors
Year:
2007
Session:
4
Full-text:
Download a PDF of this paper.
Page Number(s):
82-87