UV to IR SEDs of UV-Selected Galaxies in the ELAIS Fields: Evolution of Dust Attenuation and Star Formation Activity from z = 0.7 to 0.2

November 2007 • 2007ApJ...670..279I

Authors • Iglesias-Páramo, J. • Buat, V. • Hernández-Fernández, J. • Xu, C. K. • Burgarella, D. • Takeuchi, T. T. • Boselli, A. • Shupe, D. • Rowan-Robinson, M. • Babbedge, T. • Conrow, T. • Fang, F. • Farrah, D. • González-Solares, E. • Lonsdale, C. • Smith, G. • Surace, J. • Barlow, T. A. • Forster, K. • Friedman, P. G. • Martin, D. C. • Morrissey, P. • Neff, S. G. • Schiminovich, D. • Seibert, M. • Small, T. • Wyder, T. K. • Bianchi, L. • Donas, J. • Heckman, T. M. • Lee, Y. -W. • Madore, B. F. • Milliard, B. • Rich, R. M. • Szalay, A. S. • Welsh, B. Y. • Yi, S. K.

Abstract • We study the ultraviolet to far-infrared (hereafter UV-to-IR) SEDs of a sample of intermediate-redshift (0.2<=z<=0.7) UV-selected galaxies from the ELAIS N1 and ELAIS N2 fields by fitting a multi-wavelength data set to a library of GRASIL templates. Star formation related properties of the galaxies are derived from the library of models by using Bayesian statistics. We find a decreasing presence of galaxies with low attenuation and low total luminosity as redshift decreases, which does not hold for high total luminosity galaxies. In addition, the dust attenuation of low-mass galaxies increases as redshift decreases, and this trend seems to disappear for galaxies with M^*>=10¹¹ M_solar. This result is consistent with a mass-dependent evolution of the dust-to-gas ratio, which could be driven by a mass-dependent efficiency of star formation in star-forming galaxies. The specific star formation rates (SSFR) decrease with increasing stellar mass at all redshifts, and for a given stellar mass the SSFR decreases with decreasing redshift. The differences in the slope of the M*-SSFR relation found between this work and others at similar redshift could be explained by the adopted selection criteria of the samples, which for a UV-selected sample, favors blue, star-forming galaxies.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2007ApJ...670..279I
• PDF https://stacks.iop.org/0004-637X/670/279/pdf
• PREPRINT http://arxiv.org/abs/0707.3415
• DATA https://irsa.ipac.caltech.edu/bibdata/2007/I/2007ApJ...670..279I.html
• ELECTR https://doi.org/10.1086%2F521867