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We present the results of a search for Sloan Digital Sky Survey (SDSS)emission-line galaxies with very red 3.4mum - 4.6mum (W1-W2) colours in theWide-field Infrared Survey Explorer (WISE) Preliminary Release Source Catalogue(PRSC) aiming to find objects with hot dust emission. For this purpose weconsidered a sample of ~16000 galaxies with strong emission lines selected outof a total of ~9 SDSS spectra and identified them with the PRSC sources.We find that ~5000 sources out of the ~16000 SDSS galaxies are present in thePRSC, including ~1000 galaxies with sufficiently strong [OIII]4363 emissionlines to permit reliable determinations of the oxygen abundance. No correlationof W1-W2 with metallicity is found. On the other hand, there is clear evidencefor a redder W1-W2 index in galaxies with higher Hbeta luminosity and higherHbeta equivalent width, implying that strong UV radiation from young starburstsefficiently heats interstellar dust to high temperatures. However, galaxieswith very red colours W1-W2>2 mag, similar to that in the local extremestar-forming galaxy SBS 0335-052E, are very rare. In addition to threepreviously known sources, which are not present in our sample, we found onlyfour such galaxies.

Star-forming galaxies with hot dust emission in the Sloan Digital Sky Survey discovered by the Wide-field Infrared Survey Explorer (WISE)