Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...285...51m&link_type=abstract
Astronomy and Astrophysics 285, 51-68 (1994)
Astronomy and Astrophysics
Astrophysics
30
Galaxies: Irregular, Infrared: Galaxies, Galaxies: Ism, Stars: Formation
Scientific paper
We have used a previously determined sample of 278 dwarf galaxies for most of which B magnitudes, optical colours, HI fluxes and IRAS flux-densities are known, in order to derive luminosities, colours and surface brightnesses. Dwarf galaxy properties are compared to those of a control sample of 228 larger spiral galaxies. The dwarf galaxies have on average higher 60/100μm flux ratios and lower 12/25μm flux ratios than the spiral galaxies, indicating that the contribution of `cirrus' to the infrared emission from dwarf galaxies is relatively insignificant. In the dwarf galaxies, the 60/100μm flux ratio increases with increasing optical blueness; spiral galaxies show the opposite. Dwarf galaxies with a low optical surface brightness have low 100μm/HI ratios, but the converse is not true. Galaxies with high 100μm/HI ratios (indicative of high dust-to-gas ratios) also have high FIR/B ratios as well as high 60/100μm flux-density ratios. Although this is true for both spiral and dwarf galaxies, at given 100μm/HI ratios the dwarf galaxies have both a lower FIR/B ratio and a higher 60/100μm flux-density ratio. This result is of importance in the interpretation of FIR/B - 60/100μm diagrams in terms of star formation activity.
Israel Frank P.
Melisse P. M. J.
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