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The IRAC point response function in the warm Spitzer mission

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.

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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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Hora, Joseph L.0000-0002-5599-4650
Marengo, Massimo0000-0001-9910-9230
Lowrance, Patrick J.0000-0001-8014-0270
Carey, Sean J.0000-0002-0221-6871
Surace, Jason A.0000-0001-7291-0087
Ingalls, James G.0000-0003-4714-1364
Laine, Seppo0000-0003-1250-8314
Fazio, Giovanni G.0000-0002-0670-0708
Ashby, Matthew L. N.0000-0002-3993-0745
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)
Funding AgencyGrant Number
Subject Keywords:Spitzer Space Telescope, IRAC, Infrared camera, point response function, point spread function
Series Name:Proceedings of SPIE
Issue or Number:8442
Record Number:CaltechAUTHORS:20191002-140353260
Persistent URL:
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);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99024
Deposited By: Tony Diaz
Deposited On:02 Oct 2019 21:26
Last Modified:16 Nov 2021 17:43

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