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A Spitzer IRAC Measure of the Zodiacal Light

Krick, Jessica E. and Glaccum, William J. and Carey, Sean J. and Lowrance, Patrick J. and Surace, Jason A. and Ingalls, James G. and Hora, Joseph L. and Reach, William T. (2012) A Spitzer IRAC Measure of the Zodiacal Light. In: Space telescopes and instrumentation 2012: optical, infared, and millimeter wave. Proceedings of SPIE . No.8442. International Society for Optical Engineering , Bellingham, WA, Art. No. 84421X. ISBN 978-0-8194-9143-5.

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The dominant non-instrumental background source for space–based infrared observatories is the zodiacal light (ZL). We present Spitzer Infrared Array Camera (IRAC) measurements of the ZL at 3.6, 4.5, 5.8, and 8.0 μm, taken as part of the instrument calibrations. We measure the changing surface brightness levels in approximately weekly IRAC observations near the north ecliptic pole over the period of roughly 8.5 years. This long time baseline is crucial for measuring the annual sinusoidal variation in the signal levels due to the tilt of the dust disk with respect to the ecliptic, which is the true signal of the ZL. This is compared to both Cosmic Background Explorer Diffuse Infrared Background Experiment data and a ZL model based thereon. Our data show a few percent discrepancy from the Kelsall et al.(1998) model including a potential warping of the interplanetary dust disk and a previously detected overdensity in the dust cloud directly behind the Earth in its orbit. Accurate knowledge of the ZL is important for both extragalactic and Galactic astronomy including measurements of the cosmic infrared background, absolute measures of extended sources, and comparison to extrasolar interplanetary dust models. IRAC data can be used to further inform and test future ZL models.

Item Type:Book Section
Related URLs:
URLURL TypeDescription Paper
Carey, Sean J.0000-0002-0221-6871
Lowrance, Patrick J.0000-0001-8014-0270
Surace, Jason A.0000-0001-7291-0087
Ingalls, James G.0000-0003-4714-1364
Hora, Joseph L.0000-0002-5599-4650
Reach, William T.0000-0001-8362-4094
Additional Information:© 2012 SPIE. Published: 22 August 2012. This research has made use of data from the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This work was based on observations obtained with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. We acknowledge the use of the Legacy Archive for Microwave Background Data Analysis (LAMBDA). Support for LAMBDA is provided by the NASA Office of Space Science.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:cosmology: diffuse radiation; interplanetary medium; infrared: diffuse background
Series Name:Proceedings of SPIE
Issue or Number:8442
Record Number:CaltechAUTHORS:20121219-075210039
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Official Citation:Jessica E. Krick ; William J. Glaccum ; Sean J. Carey ; Patrick J. Lowrance ; Jason A. Surace ; James G. Ingalls ; Joseph L. Hora ; William T. Reach; A Spitzer IRAC measure of the zodiacal light. Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 84421X (September 21, 2012); doi:10.1117/12.926664.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36036
Deposited By: Tony Diaz
Deposited On:12 Feb 2013 20:56
Last Modified:04 Nov 2019 21:33

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