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

We present the results of a search for Sloan Digital Sky Survey (SDSS) emission-line galaxies with very red 3.4µm - 4.6µm (W1 W2) colours in the Wide-field Infrared Survey Explorer (WISE) Preliminary Release Source Catalogue (PRSC) aiming to find objects with hot dust emission. For this purpose we considered a sample of � 16000 galaxies with strong emission lines selected out of a total of � 900000 SDSS spectra and identified them with the PRSC sources . We find that � 5000 sources out of the � 16000 SDSS galaxies are present in the PRSC, including � 1000 galaxies with sufficiently strong [O III] �4363 emission lines to permit reliable determinations of the oxygen abundance. No correlation of W1 W2 with metallicity is found. On the other hand, there is clear