Volume 536, December 2011
|Number of page(s)||4|
|Published online||09 December 2011|
Letter to the Editor
Star-forming galaxies with hot dust emission in the Sloan Digital Sky Survey discovered by the Wide-field Infrared Survey Explorer (WISE)
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
2 Main Astronomical Observatory, Ukrainian National Academy of Sciences, Zabolotnoho 27, Kyiv 03680, Ukraine
3 LUTH, Observatoire de Paris, CNRS, Université Paris Diderot, Place Jules Janssen 92190 Meudon, France
4 Institut für Astrophysik, Göttingen Universität, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
5 Astronomy Department, King Abdulaziz University, PO Box 80203, Jeddah, Saudi Arabia
Received: 4 November 2011
Accepted: 22 November 2011
We present the results of a search for Sloan Digital Sky Survey (SDSS) emission-line galaxies with very red 3.4 μm–4.6 μm (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 ~16 000 galaxies with strong emission lines selected out of a total of ~900 000 SDSS spectra and identified them with the PRSC sources. We find that ~5000 sources out of the ~16 000 SDSS galaxies are present in the PRSC, including ~1000 galaxies with sufficiently strong [O iii] λ4363 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 evidence for a redder W1 − W2 index in galaxies with higher Hβ luminosity and higher Hβ equivalent width, implying that strong UV radiation from young starbursts efficiently heats interstellar dust to high temperatures. However, galaxies with very red colours W1 − W2 > 2 mag, similar to that in the local extreme star-forming galaxy SBS 0335–052E, are very rare. In addition to three previously known sources, which are not present in our sample, we found only four such galaxies.
Key words: galaxies: fundamental parameters / galaxies: starburst / galaxies: ISM / galaxies: abundances
© ESO, 2011
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