Extended Emission by Dust in the Dwarf Galaxy UGC 10445

Hinz, J. L., Misselt, K., Rieke, M. J., Rieke, G. H., Smith, P. S., Blaylock, M., & Gordon, K. D.
2006, The Astrophysical Journal, 651, 874


We present Spitzer Space Telescope images of the isolated dwarf galaxy UGC 10445. The galaxy is detected at all photometric bands (3.6-160 μm), as well as in the Multiband Imaging Photometer for Spitzer (MIPS) spectral energy distribution mode (55-95 μm). We derive a star formation rate of 0.25 Msolar yr-1, based on Hα and infrared flux densities. There is over 106 Msolar of cold dust (T~18 K) in the galaxy, represented by 160 μm 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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