Extended Emission by Dust in the Dwarf Galaxy UGC 10445

We present Spitzer Space Telescope images of the isolated dwarf galaxy UGC 10445. The galaxy is detected at all photometric bands (3.6-160 km), as well as in the Multiband Imaging Photometer for Spitzer (MIPS) spectral energy distribution mode (55-95 km). We derive a star formation rate of 0.25 M su...

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Published inThe Astrophysical journal Vol. 651; no. 2; pp. 874 - 881
Main Authors Hinz, J. L, Misselt, K, Rieke, M. J, Rieke, G. H, Smith, P. S, Blaylock, M, Gordon, K. D
Format Journal Article
LanguageEnglish
Published Chicago, IL IOP Publishing 10.11.2006
University of Chicago Press
Subjects
Astronomy
Earth, ocean, space
Exact sciences and technology
Infrared galaxies
infrared: galaxies
Dwarf galaxies
galaxies: dwarf- galaxies: individual (UGC 10445)
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Summary:We present Spitzer Space Telescope images of the isolated dwarf galaxy UGC 10445. The galaxy is detected at all photometric bands (3.6-160 km), as well as in the Multiband Imaging Photometer for Spitzer (MIPS) spectral energy distribution mode (55-95 km). We derive a star formation rate of 0.25 M sub( )yr super(-1), based on Ha and infrared flux densities. There is over 10 super(6) M sub( )of cold dust (T618 K) in the galaxy, represented by 160 km emission, which extends to a larger radius than the ultraviolet (UV), optical, and near-infrared light. Such extended emission has been seen previously only in dwarf galaxies in cluster environments. We suggest that the source of heating for this dust is UV light, originating in star-forming complexes. To produce the large quantity of dust requires a higher rate of star formation in the past than is currently observed.
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ISSN:0004-637X
1538-4357
DOI:10.1086/507622