%0 Generic %1 bouwens2016spectroscopic %A Bouwens, Rychard %A Aravena, Manuel %A Decarli, Roberto %A Walter, Fabian %A da Cunha, Elisabete %A Labbe, Ivo %A Bauer, Franz %A Bertoldi, Frank %A Carilli, Chris %A Chapman, Scott %A Daddi, Emanuele %A Hodge, Jacqueline %A Ivison, Rob %A Karim, Alex %A Fevre, Olivier Le %A Magnelli, Benjamin %A Ota, Kazuaki %A Riechers, Dominik %A Smail, Ian %A van der Werf, Paul %A Weiss, Axel %A Cox, Pierre %A Elbaz, David %A Gonzalez-Lopez, Jorge %A Infante, Leopoldo %A Oesch, Pascal %A Wagg, Jeff %A Wilkins, Steve %D 2016 %K alma dust high-z lbg sfr %T ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: The Infrared Excess of UV-selected z=2-10 galaxies as a function of UV-continuum Slope and Stellar Mass %U http://arxiv.org/abs/1606.05280 %X We make use of deep 1.2mm-continuum observations (12.7microJy/beam RMS) of a 1 arcmin^2 region in the Hubble Ultra Deep Field to probe dust-enshrouded star formation from 330 Lyman-break galaxies spanning the redshift range z=2-10 (to ~2-3 Msol/yr at 1sigma over the entire range). Given the depth and area of ASPECS, we would expect to tentatively detect 35 galaxies extrapolating the Meurer z~0 IRX-beta relation to z>~2 (assuming T_d~35 K). However, only 6 tentative detections are found at z>~2 in ASPECS, with just two at >>3sigma. Subdividing z=2-10 galaxies according to stellar mass, UV luminosity, and UV-continuum slope and stacking the results, we only find a significant detection in the most massive (>10^9.75 Msol) subsample, with an infrared excess (IRX=L_IR/L_UV) consistent with previous z~2 results. However, the infrared excess we measure from our large selection of sub-L* (<10^9.75 Msol) galaxies is 0.11(-0.42)(+0.32) and 0.14(-0.14)(+0.15) at z=2-3 and z=4-10, respectively, lying below even an SMC IRX-beta relation (95% confidence). These results demonstrate the importance of stellar mass for predicting the IR luminosity of z>~2 galaxies. We furthermore find that the evolution of IRX-stellar mass relationship depends on the evolution of the dust temperature. If the dust temperature increases monotonically with redshift (as (1+z)^0.32) such that T_d~44-50 K at z>=4, current results are suggestive of little evolution in this relationship to z~6. We use these results to revisit recent estimates of the z>~3 SFR density. One less obvious implication is in interpreting the high Halpha EWs seen in z~5 galaxies: our results imply that star-forming galaxies produce Lyman-continuum photons at twice the efficiency (per unit UV luminosity) as implied in conventional models. Star-forming galaxies can then recognize the Universe, even if the escape fraction is <10%.

@misc{bouwens2016spectroscopic, abstract = {We make use of deep 1.2mm-continuum observations (12.7microJy/beam RMS) of a 1 arcmin^2 region in the Hubble Ultra Deep Field to probe dust-enshrouded star formation from 330 Lyman-break galaxies spanning the redshift range z=2-10 (to ~2-3 Msol/yr at 1sigma over the entire range). Given the depth and area of ASPECS, we would expect to tentatively detect 35 galaxies extrapolating the Meurer z~0 IRX-beta relation to z>~2 (assuming T_d~35 K). However, only 6 tentative detections are found at z>~2 in ASPECS, with just two at >>3sigma. Subdividing z=2-10 galaxies according to stellar mass, UV luminosity, and UV-continuum slope and stacking the results, we only find a significant detection in the most massive (>10^9.75 Msol) subsample, with an infrared excess (IRX=L_{IR}/L_{UV}) consistent with previous z~2 results. However, the infrared excess we measure from our large selection of sub-L* (<10^9.75 Msol) galaxies is 0.11(-0.42)(+0.32) and 0.14(-0.14)(+0.15) at z=2-3 and z=4-10, respectively, lying below even an SMC IRX-beta relation (95% confidence). These results demonstrate the importance of stellar mass for predicting the IR luminosity of z>~2 galaxies. We furthermore find that the evolution of IRX-stellar mass relationship depends on the evolution of the dust temperature. If the dust temperature increases monotonically with redshift (as (1+z)^0.32) such that T_d~44-50 K at z>=4, current results are suggestive of little evolution in this relationship to z~6. We use these results to revisit recent estimates of the z>~3 SFR density. One less obvious implication is in interpreting the high Halpha EWs seen in z~5 galaxies: our results imply that star-forming galaxies produce Lyman-continuum photons at twice the efficiency (per unit UV luminosity) as implied in conventional models. Star-forming galaxies can then recognize the Universe, even if the escape fraction is <10%.}, added-at = {2016-06-17T09:48:52.000+0200}, author = {Bouwens, Rychard and Aravena, Manuel and Decarli, Roberto and Walter, Fabian and da Cunha, Elisabete and Labbe, Ivo and Bauer, Franz and Bertoldi, Frank and Carilli, Chris and Chapman, Scott and Daddi, Emanuele and Hodge, Jacqueline and Ivison, Rob and Karim, Alex and Fevre, Olivier Le and Magnelli, Benjamin and Ota, Kazuaki and Riechers, Dominik and Smail, Ian and van der Werf, Paul and Weiss, Axel and Cox, Pierre and Elbaz, David and Gonzalez-Lopez, Jorge and Infante, Leopoldo and Oesch, Pascal and Wagg, Jeff and Wilkins, Steve}, biburl = {https://www.bibsonomy.org/bibtex/2fe5801b65d6a2dcc9b963e1dc8b7522a/miki}, description = {[1606.05280] ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: The Infrared Excess of UV-selected z=2-10 galaxies as a function of UV-continuum Slope and Stellar Mass}, interhash = {fe8a24d8accf198df1e84460598b0c5e}, intrahash = {fe5801b65d6a2dcc9b963e1dc8b7522a}, keywords = {alma dust high-z lbg sfr}, note = {cite arxiv:1606.05280Comment: 31 pages, 16 figures, 13 tables, incorporating the first feedback from the referee on our submitted ApJ manuscript, paper VI of the ASPECS (ALMA Spectroscopic Survey in the Hubble Ultra Deep Field) series}, timestamp = {2016-06-17T09:48:52.000+0200}, title = {ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: The Infrared Excess of UV-selected z=2-10 galaxies as a function of UV-continuum Slope and Stellar Mass}, url = {http://arxiv.org/abs/1606.05280}, year = 2016 }