Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-07-12
Astrophys.J.651:874-881,2006
Astronomy and Astrophysics
Astrophysics
11 pages, 5 pages, accepted to ApJ, color high res figures available upon request
Scientific paper
10.1086/507622
We present Spitzer Space Telescope images of the isolated dwarf galaxy UGC 10445. The galaxy is detected at all photometric bands (3.6-160um) as well as in the Multiband Imaging Photometer for Spitzer (MIPS) spectral energy distribution mode (55-95um). We derive a star formation rate of 0.25 M_sun/yr based on H-alpha and infrared flux densities. There is over 10^6 solar masses of cold dust (T~18K) in the galaxy, represented by 160um emission, that 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 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 observed currently.
Blaylock Myra
Gordon Karl Douglas
Hinz Joannah L.
Misselt Karl
Rieke George H.
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