English

Probing star formation and ISM properties using galaxy disk inclination III: Evolution in dust opacity and clumpiness between redshift 0.0 < z < 0.7 constrained from UV to NIR

Astrophysics of Galaxies 2022-06-14 v2

Abstract

(Abridged) In this paper, we use the Tuffs et al. attenuation - inclination models in ultraviolet (UV), optical, and near-infrared (NIR) bands to investigate the average global dust properties in galaxies as a function of stellar mass MM_{*}, stellar mass surface density μ\mu_{*}, star-formation rate SFRSFR, specific star-formation rate sSFRsSFR, star-formation main-sequence offset dMSdMS, and star-formation rate surface density ΣSFR\Sigma_{SFR} at redshifts z0z \sim 0 and z0.7z \sim 0.7. We use star-forming galaxies from SDSS (\sim 20000) and GAMA (\sim 2000) to form our low-z sample at 0.04<z<0.10.04 < z < 0.1 and star-forming galaxies from COSMOS (\sim 2000) for the sample at 0.6<z<0.80.6 <z < 0.8. We find that galaxies at z0.7z \sim 0.7 have higher optical depth τBf\tau_{B}^{f} and clumpiness FF than galaxies at z0z \sim 0. The increase in FF hints that the stars of z0.7z \sim 0.7 galaxies are less likely to escape their birth cloud, which might indicate that the birth clouds are larger. We also found that τBf\tau_{B}^{f} increases with MM_{*} and μ\mu_{*}independent of sample and therefore redshift. We found no clear trends in τBf\tau_{B}^{f} or FF with SFRSFR, which could imply that the dust mass distribution is independent of SFRSFR. In turn, this would imply that the balance of dust formation and destruction is independent of the SFRSFR. Based on an analysis of the inclination-dependence of the Balmer decrement, we find that reproducing the Balmer line emission requires not only a completely optically thick dust component associated with star forming regions, as in the standard Tuffs et al. model, but an extra component of optically thin dust within the birth clouds. This new component implies the existence of dust inside HII regions that attenuates the Balmer emission before it escapes through gaps in the birth cloud and we find it is more important in high-mass galaxies.

Keywords

Cite

@article{arxiv.2201.10568,
  title  = {Probing star formation and ISM properties using galaxy disk inclination III: Evolution in dust opacity and clumpiness between redshift 0.0 < z < 0.7 constrained from UV to NIR},
  author = {S. A. van der Giessen and S. K. Leslie and B. Groves and J. A. Hodge and C. C. Popescu and M. T. Sargent and E. Schinnerer and R. J. Tuffs},
  journal= {arXiv preprint arXiv:2201.10568},
  year   = {2022}
}

Comments

25 pages, 24 figures, published in A&A