%0 Generic %1 barisic2017properties %A Barišić, Ivana %A Faisst, Andreas L. %A Capak, Peter L. %A Pavesi, Riccardo %A Riechers, Dominik A. %A Scoville, Nick Z. %A Cooke, Kevin C. %A Kartaltepe, Jeyhan S. %A Casey, Caitlin M. %A Smolčić, Vernesa %D 2017 %K dust galaxies high-z %T Dust Properties of CII Detected z $\sim$ 5.5 Galaxies: New HST/WFC3 Near-IR Observations %U http://arxiv.org/abs/1707.02980 %X We examine the rest-frame ultra-violet (UV) properties of 10 CII$łambda158\,m$$-$detected galaxies at $z\sim5.5$ in COSMOS using new HST/WFC3 near-infrared imaging. Together with pre-existing $158\,\rm m-$continuum and CII line measurements by ALMA, we study their dust attenuation properties on the IRX-$\beta$ diagram, which connects the total dust emission ($\propto$ IRX=log($L_FIR/L_1600$)) to the line-of-sight dust column ($\propto\beta$). We find systematically bluer UV continuum spectral slopes ($\beta$) compared to previous low-resolution ground-based measurements, which relieves some of the tension between models of dust attenuation and observations at high redshifts. While most of the galaxies are consistent with local starburst or Small Magellanic cloud like dust properties, we find galaxies with low IRX values and a large range in $\beta$ that cannot be explained by models of a uniform dust distribution well mixed with stars. A stacking analysis of Keck/DEIMOS optical spectra indicates that these galaxies are metal-poor with young stellar populations which could significantly alter their spatial dust distribution.

@misc{barisic2017properties, abstract = {We examine the rest-frame ultra-violet (UV) properties of 10 [CII]$\lambda158\,{\rm \mu m}$$-$detected galaxies at $z\sim5.5$ in COSMOS using new HST/WFC3 near-infrared imaging. Together with pre-existing $158\,{\rm \mu m}-$continuum and [CII] line measurements by ALMA, we study their dust attenuation properties on the IRX-$\beta$ diagram, which connects the total dust emission ($\propto$ IRX=log($L_{FIR}/L_{1600}$)) to the line-of-sight dust column ($\propto\beta$). We find systematically bluer UV continuum spectral slopes ($\beta$) compared to previous low-resolution ground-based measurements, which relieves some of the tension between models of dust attenuation and observations at high redshifts. While most of the galaxies are consistent with local starburst or Small Magellanic cloud like dust properties, we find galaxies with low IRX values and a large range in $\beta$ that cannot be explained by models of a uniform dust distribution well mixed with stars. A stacking analysis of Keck/DEIMOS optical spectra indicates that these galaxies are metal-poor with young stellar populations which could significantly alter their spatial dust distribution.}, added-at = {2017-07-12T09:59:17.000+0200}, author = {Barišić, Ivana and Faisst, Andreas L. and Capak, Peter L. and Pavesi, Riccardo and Riechers, Dominik A. and Scoville, Nick Z. and Cooke, Kevin C. and Kartaltepe, Jeyhan S. and Casey, Caitlin M. and Smolčić, Vernesa}, biburl = {https://www.bibsonomy.org/bibtex/2ac69ea1c760f913cae73285664c94292/miki}, description = {[1707.02980] Dust Properties of [CII] Detected z $\sim$ 5.5 Galaxies: New HST/WFC3 Near-IR Observations}, interhash = {f03480da46de38a12643d40d5c144d83}, intrahash = {ac69ea1c760f913cae73285664c94292}, keywords = {dust galaxies high-z}, note = {cite arxiv:1707.02980Comment: 9 pages, 3 figures, 1 table. Accepted for publication in The Astrophysical Journal}, timestamp = {2017-07-12T09:59:17.000+0200}, title = {Dust Properties of [CII] Detected z $\sim$ 5.5 Galaxies: New HST/WFC3 Near-IR Observations}, url = {http://arxiv.org/abs/1707.02980}, year = 2017 }