%0 Generic %1 fudamoto2017attenuation %A Fudamoto, Yoshinobu %A Oesch, Pascal A. %A Schinnerer, Eva %A Groves, Brent %A Karim, Alexander %A Magnelli, Benjamin %A Sargent, Mark T. %A Cassata, Paolo %A Lang, Philipp %A Fèvre, Olivier Le %A Smolčić, Vernesa %A Tasca, Lidia %D 2017 %K dust evolution forming galaxies high redshift star %T The Dust Attenuation of Star-forming Galaxies at $z\sim3$ and Beyond: New Insights from ALMA Observations %U http://arxiv.org/abs/1705.01559 %X We present results on the dust attenuation of galaxies at redshift $\sim3-6$ by studying the relationship between the UV spectral slope ($\beta_UV$) and the infrared excess (IRX; $L_IR$/$L_UV$) using ALMA far-infrared continuum observations. Our study is based on a sample of 67 massive, star-forming galaxies with a median mass of $M_\ast\sim 10^10.7\,M_ødot$ spanning a redshift range $z=2.6-3.7$ (median $z=3.2$) that were observed with ALMA band-6. Both the individual ALMA detections (41 sources) and stacks including all galaxies show the IRX-$\beta_UV$ relationship at $z\sim3$ is mostly consistent with that of local starburst galaxies on average. However, we find evidence for a large dispersion around the mean relationship by up to $\pm0.5$ dex. Nevertheless, the locally calibrated dust correction factors based on the IRX-$\beta_\rm UV$ relation are on average applicable to main-sequence $z\sim3$ galaxies. This does not appear to be the case at even higher redshifts, however. Using public ALMA observations of $z\sim4-6$ galaxies we find evidence for a significant evolution in the IRX-$\beta_UV$ and the IRX-$M_\ast$ relations beyond $z\sim3$ toward lower IRX values. We discuss several caveats that could affect these results, including the assumed dust temperature. ALMA observations of larger $z>3$ galaxy samples will be required to confirm this intriguing redshift evolution.

@misc{fudamoto2017attenuation, abstract = {We present results on the dust attenuation of galaxies at redshift $\sim3-6$ by studying the relationship between the UV spectral slope ($\beta_{\rm UV}$) and the infrared excess (IRX; $L_{\rm IR}$/$L_{\rm UV}$) using ALMA far-infrared continuum observations. Our study is based on a sample of 67 massive, star-forming galaxies with a median mass of $M_{\ast}\sim 10^{10.7}\,M_{\rm \odot}$ spanning a redshift range $z=2.6-3.7$ (median $z=3.2$) that were observed with ALMA band-6. Both the individual ALMA detections (41 sources) and stacks including all galaxies show the IRX-$\beta_{\rm UV}$ relationship at $z\sim3$ is mostly consistent with that of local starburst galaxies on average. However, we find evidence for a large dispersion around the mean relationship by up to $\pm0.5$ dex. Nevertheless, the locally calibrated dust correction factors based on the IRX-$\beta_{\rm UV}$ relation are on average applicable to main-sequence $z\sim3$ galaxies. This does not appear to be the case at even higher redshifts, however. Using public ALMA observations of $z\sim4-6$ galaxies we find evidence for a significant evolution in the IRX-$\beta_{\rm UV}$ and the IRX-$M_{\ast}$ relations beyond $z\sim3$ toward lower IRX values. We discuss several caveats that could affect these results, including the assumed dust temperature. ALMA observations of larger $z>3$ galaxy samples will be required to confirm this intriguing redshift evolution.}, added-at = {2017-05-05T10:07:20.000+0200}, author = {Fudamoto, Yoshinobu and Oesch, Pascal A. and Schinnerer, Eva and Groves, Brent and Karim, Alexander and Magnelli, Benjamin and Sargent, Mark T. and Cassata, Paolo and Lang, Philipp and Fèvre, Olivier Le and Smolčić, Vernesa and Tasca, Lidia}, biburl = {https://www.bibsonomy.org/bibtex/2959a9638ee084df38c2028b916f97c66/miki}, description = {[1705.01559] The Dust Attenuation of Star-forming Galaxies at $z\sim3$ and Beyond: New Insights from ALMA Observations}, interhash = {5ddd9865217919f39ff98e5ec4e42541}, intrahash = {959a9638ee084df38c2028b916f97c66}, keywords = {dust evolution forming galaxies high redshift star}, note = {cite arxiv:1705.01559Comment: 8 pages, 4 figures, submitted to MNRAS}, timestamp = {2017-05-05T10:07:20.000+0200}, title = {The Dust Attenuation of Star-forming Galaxies at $z\sim3$ and Beyond: New Insights from ALMA Observations}, url = {http://arxiv.org/abs/1705.01559}, year = 2017 }