Abstract
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 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 [OIII]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 evidence for a redder W1-W2 index in galaxies with higher Hbeta luminosity and higher Hbeta 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.
Highlights
Nearby star-forming emission-line galaxies play an important role for our understanding of star-formation processes in low-metallicity environments, and they can be considered as local counterparts or “analogs” of high-redshift starforming Lyman-break galaxies (LBGs)
In the present paper we attempt to find new star-forming galaxies selected from the Data Release 7 (DR7) of the Sloan Digital Sky Survey (SDSS) with red Wide-field Infrared Survey Explorer (WISE) W1 − W2 colours in the Preliminary Release Source Catalogue (PRSC), which covers 57% of the sky
We carried out a search for star-forming Sloan Digital Sky Survey (SDSS) galaxies with strong emission lines in the Widefield Infrared Survey Explorer (WISE) Preliminary Release Source Catalogue (PRSC) aiming to find galaxies with hot dust emission at wavelengths λ3.4–4.6 μm (W1 and W2 bands)
Summary
Nearby star-forming emission-line galaxies play an important role for our understanding of star-formation processes in low-metallicity environments, and they can be considered as local counterparts or “analogs” of high-redshift starforming Lyman-break galaxies (LBGs). Their metallicities are subsolar, and their star-formation rates (SFRs) of ∼4–25 M yr−1 are overlapping with those for LBGs. Recently, Cardamone et al (2009) selected a sample of 251 compact strongly star-forming galaxies at z ∼ 0.112–0.36 on the basis of their intense green colour on the Sloan Digital Sky Survey (SDSS) images (“green pea” galaxies), which again are similar to LBGs owing to their low metallicity and high SFRs. Cardamone et al (2009) selected a sample of 251 compact strongly star-forming galaxies at z ∼ 0.112–0.36 on the basis of their intense green colour on the Sloan Digital Sky Survey (SDSS) images (“green pea” galaxies), which again are similar to LBGs owing to their low metallicity and high SFRs. In the present paper we attempt to find new star-forming galaxies selected from the Data Release 7 (DR7) of the SDSS with red WISE W1 − W2 colours in the Preliminary Release Source Catalogue (PRSC), which covers 57% of the sky
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