Extended emission by dust in the dwarf galaxy UGC 10445

J. L. Hinz, K. Misselt, M. J. Rieke, G. H. Rieke, P. S. Smith, M. Blaylock, K. D. Gordon

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


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 M yr-1, based on Hα and infrared flux densities. There is over 106M 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.

Original languageEnglish (US)
Pages (from-to)874-881
Number of pages8
JournalAstrophysical Journal
Issue number2 I
StatePublished - Nov 10 2006


  • Galaxies: dwarf
  • Galaxies: individual (UGC 10445)
  • Infrared: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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