GOODS- HERSCHEL : STAR FORMATION, DUST ATTENUATION, AND THE FIR–RADIO CORRELATION ON THE MAIN SEQUENCE OF STAR-FORMING GALAXIES UP TO z ≃ 4

• Published in: The Astrophysical journal Vol. 807; no. 2; pp. 1 - 20
• Main Authors: Pannella, M, Elbaz, D, Daddi, E, Dickinson, M, Hwang, H S, Schreiber, C, Strazzullo, V, Aussel, H, Bethermin, M, Buat, V
• Format: Journal Article
• Language: English
• Published: United States 10.07.2015
• Subjects: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; Asymptotic properties; ATTENUATION; Correlation; CORRELATIONS; Dust; FAR INFRARED RADIATION; GALAXIES; MASS; PROBES; RED SHIFT; Slopes; STAR EVOLUTION; Star formation; STARS; ULTRAVIOLET SPECTRA
• ISSN: 1538-4357; 0004-637X; 1538-4357
• DOI: 10.1088/0004-637X/807/2/141

We use deep panchromatic data sets in the GOODS-N field, from GALEX to the deepest Herschel far-infrared (FIR) and VLA radio continuum imaging, to explore the evolution of star-formation activity and dust attenuation properties of star-forming galaxies to z [Asymptotically = to] 4, using mass-complete samples. Our main results can be summarized as follows: (i) the slope of the star-formation rate-M sub(*) correlation is consistent with being constant [Asymptotically = to]0.8 up to z [Asymptotically = to] 1.5, while its normalization keeps increasing with redshift; (ii) for the first time we are able to explore the FIR-radio correlation for a mass-selected sample of star-forming galaxies: the correlation does not evolve up to z [Asymptotically = to] 4; (iii) we confirm that galaxy stellar mass is a robust proxy for UV dust attenuation in star-forming galaxies, with more massive galaxies being more dust attenuated. Strikingly, we find that this attenuation relation evolves very weakly with redshift, with the amount of dust attenuation increasing by less than 0.3 mag over the redshift range [0.5-4] for a fixed stellar mass; (iv) the correlation between dust attenuation and the UV spectral slope evolves with redshift, with the median UV slope becoming bluer with redshift. By z [Asymptotically = to] 3, typical UV slopes are inconsistent, given the measured dust attenuations, with the predictions of commonly used empirical laws. (v) Finally, building on existing results, we show that gas reddening is marginally larger (by a factor of around 1.3) than the stellar reddening at all redshifts probed. Our results support a scenario where the ISM conditions of typical star-forming galaxies evolve with redshift, such that at z [> or =, slanted] 1.5 Main Sequence galaxies have ISM conditions moving closer to those of local starbursts.