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HiRes deconvolution of Spitzer infrared images

Velusamy, T. and Marsh, K. A. and Beichman, C. A. and Backus, C. R. and Thompson, T. J. (2008) HiRes deconvolution of Spitzer infrared images. Astronomical Journal, 136 (1). pp. 197-211. ISSN 0004-6256. doi:10.1088/0004-6256/136/1/197.

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Spitzer provides unprecedented sensitivity in the infrared (IR), but the spatial resolution is limited by a relatively small aperture (0.85 m) of the primary mirror. In order to maximize the scientific return it is desirable to use processing techniques which make the optimal use of the spatial information in the observations. We have developed a deconvolution technique for Spitzer images. The algorithm, "HiRes" and its implementation has been discussed by Backus et al. in 2005. Here we present examples of Spitzer IR images from the Infrared Array Camera (IRAC) and MIPS, reprocessed using this technique. Examples of HiRes processing include a variety of objects from point sources to complex extended regions. The examples include comparison of Spitzer deconvolved images with high-resolution Keck and Hubble Space Telescope images. HiRes deconvolution improves the visualization of spatial morphology by enhancing resolution (to sub-arcsecond levels in the IRAC bands) and removing the contaminating sidelobes from bright sources. The results thereby represent a significant improvement over previously-published Spitzer images. The benefits of HiRes include (a) sub-arcsec resolution (~0".6-0".8 for IRAC channels); (b) the ability to detect sources below the diffraction-limited confusion level; (c) the ability to separate blended sources, and thereby provide guidance to point-source extraction procedures; (d) an improved ability to show the spatial morphology of resolved sources. We suggest that it is a useful technique to identify features which are interesting enough for follow-up deeper analysis.

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Marsh, K. A.0000-0003-0107-7803
Beichman, C. A.0000-0002-5627-5471
Additional Information:© 2008 The American Astronomical Society. Received 2007 September 24; accepted 2008 April 9; published 2008 June 6. We thank the referee for useful comments, particularly in regard to comparison of Spitzer deconvolved images with high-spatial- resolution images. We also thank M. Ressler and Bo Reipurth for providing the Keck and HST NIRCAM FITS images. The research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. The HiRes work was supported by the Center for Long Wavelength Astrophysics in JPL. The authors thank C. Lawrence, W. Langer, and M. Werner for their help at various levels of this research.
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Subject Keywords:infrared: general; techniques: high angular resolution
Issue or Number:1
Record Number:CaltechAUTHORS:20090427-134647781
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14089
Deposited By: Tony Diaz
Deposited On:09 Jul 2009 23:58
Last Modified:08 Nov 2021 22:43

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