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Absolute Calibration and Characterization of the Multiband Imaging Photometer for Spitzer. III. An Asteroid‐based Calibration of MIPS at 160 μm

Stansberry, J. A. and Gordon, K. D. and Bhattacharya, B. and Engelbracht, C. W. and Rieke, G. H. and Marleau, F. R. and Fadda, D. and Frayer, D. T. and Noriega-Crespo, A. and Wachter, S. and Young, E. T. and Müller, T. G. and Kelly, D. M. and Blaylock, M. and Henderson, D. and Neugebauer, G. and Beeman, J. W. and Haller, E. E. (2007) Absolute Calibration and Characterization of the Multiband Imaging Photometer for Spitzer. III. An Asteroid‐based Calibration of MIPS at 160 μm. Publications of the Astronomical Society of the Pacific, 119 (859). pp. 1038-1051. ISSN 0004-6280. doi:10.1086/521880. https://resolver.caltech.edu/CaltechAUTHORS:20100113-110545605

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Abstract

We describe the absolute calibration of the Multiband Imaging Photometer for Spitzer (MIPS) 160 μm channel. After the on‐orbit discovery of a near‐IR ghost image that dominates the signal for sources hotter than about 2000 K, we adopted a strategy utilizing asteroids to transfer the absolute calibrations of the MIPS 24 and 70 μm channels to the 160 μm channel. Near‐simultaneous observations at all three wavelengths are taken, and photometry at the two shorter wavelengths is fit using the standard thermal model. The 160 μm flux density is predicted from those fits and compared with the observed 160 μm signal to derive the conversion from instrumental units to surface brightness. The calibration factor we derive is 41.7 MJy sr^(−1) MIPS160^(−1) (MIPS160 being the instrumental units). The scatter in the individual measurements of the calibration factor, as well as an assessment of the external uncertainties inherent in the calibration, lead us to adopt an uncertainty of 5.0 MJy sr^(−1) MIPS160^(−1) (12%) for the absolute uncertainty on the 160 μm flux density of a particular source as determined from a single measurement. For sources brighter than about 2 Jy, nonlinearity in the response of the 160 μm detectors produces an underestimate of the flux density: for objects as bright as 4 Jy, measured flux densities are likely to be ≃20% too low. This calibration has been checked against that of the ISO (using ULIRGs) and IRAS (using IRAS‐derived diameters), and is consistent with those at the 5% level.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1086/521880DOIArticle
https://arxiv.org/abs/0707.2103arXivDiscussion Paper
ORCID:
AuthorORCID
Rieke, G. H.0000-0003-2303-6519
Fadda, D.0000-0002-3698-7076
Frayer, D. T.0000-0003-1924-1122
Noriega-Crespo, A.0000-0002-6296-8960
Alternate Title:Absolute Calibration and Characterization of the Multiband Imaging Photometer for Spitzer. III. An Asteroid-based Calibration of MIPS at 160 microns
Additional Information:© 2007 Astronomical Society of the Pacific. Received 2006 November 15; accepted 2007 July 25; published 2007 September 28. 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 NASA contract 1407. Support for this work was provided by NASA through contract 1255094 issued by JPL/Caltech. Ephemerides were computed using the services provided by the Solar System Dynamics group at JPL. We thank an anonymous reviewer for input that improved this paper significantly. And we acknowledge the wise insight of Douglas Adams, who pointed out over 20 years ago that the answer is 42.
Funders:
Funding AgencyGrant Number
NASA1255094
NASA/JPL/CaltechUNSPECIFIED
Issue or Number:859
DOI:10.1086/521880
Record Number:CaltechAUTHORS:20100113-110545605
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20100113-110545605
Official Citation:Absolute Calibration and Characterization of the Multiband Imaging Photometer for Spitzer. III. An Asteroid‐based Calibration of MIPS at 160 μm J. A. Stansberry, K. D. Gordon, B. Bhattacharya, C. W. Engelbracht, G. H. Rieke, F. R. Marleau, D. Fadda, D. T. Frayer, A. Noriega‐Crespo, S. Wachter, E. T. Young, T. G. Müller, D. M. Kelly, M. Blaylock, D. Henderson, G. Neugebauer, J. W. Beeman, and E. E. Haller Publications of the Astronomical Society of the Pacific 2007 119:859, 1038-1051
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17164
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:25 Jan 2010 20:06
Last Modified:08 Nov 2021 23:33

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