SCUSS u-BAND EMISSION AS A STAR-FORMATION-RATE INDICATOR

Zhimin Zhou, Xu Zhou, Hong Wu, Xiao Hui Fan, Zhou Fan, Zhao Ji Jiang, Yi Peng Jing, Cheng Li, Michael Lesser, Lin Hua Jiang, Jun Ma, Jun Dan Nie, Shi Yin Shen, Jia Li Wang, Zhen Yu Wu, Tian Meng Zhang, Hu Zou

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1 Scopus citations

Abstract

We present and analyze the possibility of using optical u-band luminosities to estimate star-formation rates (SFRs) of galaxies based on the data from the South Galactic Cap u band Sky Survey (SCUSS), which provides a deep u-band photometric survey covering about 5000 deg2 of the South Galactic Cap. Based on two samples of normal star-forming galaxies selected by the BPT diagram, we explore the correlations between u-band, Hα, and IR luminosities by combing SCUSS data with the Sloan Digital Sky Survey and Wide-field Infrared Survey Explorer (WISE). The attenuation-corrected u-band luminosities are tightly correlated with the Balmer decrement-corrected Hα luminosities with an rms scatter of ∼0.17 dex. The IR-corrected u luminosities are derived based on the correlations between the attenuation of u-band luminosities and WISE 12 (or 22) μm luminosities, and then calibrated with the Balmer-corrected Hα luminosities. The systematic residuals of these calibrations are tested against the physical properties over the ranges covered by our sample objects. We find that the best-fitting nonlinear relations are better than the linear ones and recommended to be applied in the measurement of SFRs. The systematic deviations mainly come from the pollution of old stellar population and the effect of dust extinction; therefore, a more detailed analysis is needed in future work.

Original languageEnglish (US)
Article number70
JournalAstrophysical Journal
Volume835
Issue number1
DOIs
StatePublished - Jan 20 2017

Keywords

  • dust, extinction
  • galaxies: ISM
  • galaxies: star formation
  • infrared: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Zhou, Z., Zhou, X., Wu, H., Fan, X. H., Fan, Z., Jiang, Z. J., Jing, Y. P., Li, C., Lesser, M., Jiang, L. H., Ma, J., Nie, J. D., Shen, S. Y., Wang, J. L., Wu, Z. Y., Zhang, T. M., & Zou, H. (2017). SCUSS u-BAND EMISSION AS A STAR-FORMATION-RATE INDICATOR. Astrophysical Journal, 835(1), [70]. https://doi.org/10.3847/1538-4357/835/1/70