Star formation rates of star-forming galaxies from the WISE all-sky survey

Xiao Qing Wen, Hong Wu, Yi Nan Zhu, Man I. Lam, Chao Jian Wu, James Wicker, R. J. Long, Yong Heng Zhao

    Research output: Contribution to journalArticlepeer-review


    We explore correlations between extinction-corrected Hα, Hβ and [O II]double luminosities versus 12- and 22-μm band luminosities, based on matching samples from the Sloan Digital Sky Survey (SDSS) and the Wide-field Infrared Survey Explorer (WISE). All the coefficients show strong correlations between Balmer lines and mid-infrared (MIR) luminosities, while the extinction-corrected [O II]double shows a weaker correlation with MIR luminosities. The extinction-corrected emission-line (EL) luminosities are more tightly correlated with linear combinations of EL(obs) and MIR luminosities than with pure MIR luminosities. Linear combinations include both direct and dust-obscured star formation activity in galaxies and offer an improved star formation rate (SFR) indicator for star-forming galaxies. The factor that causes log10LMIR/log10L to vary is the metallicity. We find that log10(L(obs) + α × LMIR) and log10(L[O II]double(obs) + α × LMIR), rather than pure MIR luminosities or L[O II]double alone, are good proxies for extinction-corrected log10L, with a residual that is independent of metallicity. The morphologies have weak correlations with log10LMIR/log10LEL ratios. E(B - V) can be estimated by log10[LMIR/L(obs)].

    Original languageEnglish
    Article numberstt2112
    Pages (from-to)97-115
    Number of pages19
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number1
    Publication statusPublished - Feb 2014


    • Dust, Extinction
    • Galaxies: Evolution
    • Galaxies: ISM
    • Galaxies: Star formation
    • H ii regions
    • Infrared: Galaxies


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