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For refcode 1994A&A...285...51M:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1994A&A...285...51M Global properties of dwarf galaxies II. Colours and Luminosities J.P.M. Melisse and F.P. Israel Leiden Observatory, P.O. Box 9513, NL-2300 RA Leiden, The Netherlands Received 1 July 1993/Accepted 9 October 1993 Abstract. 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 60/100 micron flux ratios and lower 12/25 micron 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 60/100 micron flux ratio increases with increasing optical blueness; spiral galaxies show the opposite. Dwarf galaxies with a low optical surface brightness have low 100 micron/HI ratios, but the converse is not true. Galaxies with high 100 micron/HI ratios (indicative of high dust-to- gas ratios) also have high FIR/B ratios as well as high 60/100 micron flux-density ratios. Although this is true for both spiral and dwarf galaxies, at given 100 micron/HI ratios the dwarf galaxies have both a lower FIR/B ratio and a higher 60/100 micron flux-density ratio. This result is of importance in the interpretation of FIR/B - 60/100 micron diagrams in terms of star formation activity. Key words: galaxies: irregular - infrared: galaxies - galaxies: ISM - stars: formation
Retrieve 278 NED objects in this reference.
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