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Correcting distortions in the infrared array camera during the cryogenic mission of the Spitzer Space Telescope

Grillmair, Carl J. and Lowrance, Patrick J. and Carey, Sean J. and Stauffer, John R. and Ingalls, James G. and Krick, Jessica E. and Glaccum, William J. and Laine, Seppo and Paladini, Roberta and Shupe, David L. and Van Dyk, Schuyler D. (2018) Correcting distortions in the infrared array camera during the cryogenic mission of the Spitzer Space Telescope. In: Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave. Proceedings of SPIE. No.10698. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 106985D. ISBN 9781510619494. http://resolver.caltech.edu/CaltechAUTHORS:20181207-083716639

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Abstract

We describe our ongoing efforts to model the field distortions of the Infrared Array Camera (IRAC) during the cryogenic portion of the Spitzer Space Telescope’s operations. We have compared over two million measured source positions in ~35,000 IRAC images with their positions in Gaia Data Release 1. Fitting 3rd and 5th order polynomials to the measured offsets, we find systematic uncertainties in IRAC-measured positions that are in the 50-60 milliarcsecond range for the 3.6 micron array, and 120-150 milliarcsecond range for the 4.5 micron array. A 5th-order fit does not appear to significantly improve the results over a 3rd order fit. However, this may be due at least partly to the failure of our current centroiding technique to account for variations in the Point Response Functions across each detector. We anticipate making several improvements in our continuing analysis, including (i) the refitting of the positions and position angles of each IRAC image using the Gaia catalog, (ii) making use of a less position-sensitive centroiding algorithm, (iii) correcting where possible for the proper motions of detected sources, and (iv) significantly increasing the number of source position measurements. Once finalized, the resulting distortion corrections will be incorporated into the headers of the archived images.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2313706DOIArticle
ORCID:
AuthorORCID
Grillmair, Carl J.0000-0003-4072-169X
Lowrance, Patrick J.0000-0001-8014-0270
Carey, Sean J.0000-0002-0221-6871
Stauffer, John R.0000-0003-3595-7382
Shupe, David L.0000-0003-4401-0430
Van Dyk, Schuyler D.0000-0001-9038-9950
Additional Information:© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE).
Group:Infrared Processing and Analysis Center (IPAC)
Subject Keywords:Spitzer Space Telescope
Record Number:CaltechAUTHORS:20181207-083716639
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181207-083716639
Official Citation:Carl J. Grillmair, Patrick J. Lowrance, Sean J. Carey, John R. Stauffer, James G. Ingalls, Jessica E. Krick, William J. Glaccum, Seppo Laine, Roberta Paladini, David L. Shupe, Schuyler D. Van Dyk, "Correcting distortions in the infrared array camera during the cryogenic mission of the Spitzer Space Telescope," Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106985D (6 July 2018); doi: 10.1117/12.2313706
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91556
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:07 Dec 2018 23:01
Last Modified:07 Dec 2018 23:01

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