Hora, Joseph L. and Marengo, Massimo and Park, Rebecca and Wood, Denise and Hoffmann, William F. and Lowrance, Patrick J. and Carey, Sean J. and Surace, Jason A. and Krick, Jessica E. and Glaccum, William J. and Ingalls, James G. and Laine, Seppo and Fazio, Giovanni G. and Ashby, Matthew L. N. and Wang, Zhong (2012) The IRAC point response function in the warm Spitzer mission. In: Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave. Proceedings of SPIE. No.8442. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 844239. ISBN 9780819491435. https://resolver.caltech.edu/CaltechAUTHORS:20191002-140353260
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Abstract
The Infrared Array Camera (IRAC) is now the only science instrument in operation on the Spitzer Space Telescope. The 3.6 and 4.5 µm channels are temperature-stabilized at ~28.7K, and the sensitivity of IRAC is nearly identical to what it was in the cryogenic mission. The instrument point response function (PRF) is a set of values from which one can determine the point spread function (PSF) for a source at any position in the field, and is dependent on the optical characteristics of the telescope and instrument as well as the detector sampling and pixel response. These data are necessary when performing PSF-fitting photometry of sources, for deconvolving an IRAC image, subtracting out a bright source in a field, or for estimating the flux of a source that saturates the detector. Since the telescope and instrument are operating at a higher temperature in the post-cryogenic mission, we re-derive the PRFs for IRAC from measurements obtained after the warm mission temperature set point and detector biases were finalized and compare them to the 3.6 and 4.5 µm PRFs determined during the cryogenic mission to assess any changes.
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Additional Information: | © 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. | ||||||||||||||||||||
Group: | Infrared Processing and Analysis Center (IPAC) | ||||||||||||||||||||
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Subject Keywords: | Spitzer Space Telescope, IRAC, Infrared camera, point response function, point spread function | ||||||||||||||||||||
Series Name: | Proceedings of SPIE | ||||||||||||||||||||
Issue or Number: | 8442 | ||||||||||||||||||||
DOI: | 10.1117/12.926894 | ||||||||||||||||||||
Record Number: | CaltechAUTHORS:20191002-140353260 | ||||||||||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20191002-140353260 | ||||||||||||||||||||
Official Citation: | Joseph L. Hora, Massimo Marengo, Rebecca Park, Denise Wood, William F. Hoffmann, Patrick J. Lowrance, Sean J. Carey, Jason A. Surace, Jessica E. Krick, William J. Glaccum, James G. Ingalls, Seppo Laine, Giovanni G. Fazio, Matthew L. N. Ashby, and Zhong Wang "The IRAC point response function in the warm Spitzer mission", Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 844239 (21 September 2012); https://doi.org/10.1117/12.926894 | ||||||||||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||
ID Code: | 99024 | ||||||||||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||||||||||
Deposited By: | Tony Diaz | ||||||||||||||||||||
Deposited On: | 02 Oct 2019 21:26 | ||||||||||||||||||||
Last Modified: | 16 Nov 2021 17:43 |
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