%0 Generic %1 schaerer2014constraints %A Schaerer, D. %A Boone, F. %A Zamojski, M. %A Staguhn, J. %A Dessauges-Zavadsky, M. %A Finkelstein, S. %A Combes, F. %A Richard, J. %D 2014 %K dust emission galaxy high-z %T New constraints on dust emission and UV attenuation of z=6.5-7.5 galaxies from IRAM and ALMA observations %U http://arxiv.org/abs/1407.5793 %X We have targeted two recently discovered Lyman break galaxies (LBGs) to search for dust continuum and CII 158 micron line emission. The strongly lensed z~6.8 LBG A1703-zD1 behind the galaxy cluster Abell 1703, and the spectroscopically confirmed z=7.508 LBG z8-GND-5296 in the GOODS-N field have been observed with the Plateau de Bure interferometer (PdBI) at 1.2mm. These observations have been combined with those of three z>6.5 Lya emitters (named HCM6A, Himiko, and IOK-1), for which deep measurements were recently obtained with the PdBI and ALMA. CII is undetected in both galaxies, providing a deep upper limit for Abell1703-zD1, comparable to recent ALMA non-detections. Dust continuum emission from Abell1703-zD1 and z8-GND-5296 is not detected with an rms of 0.12 and 0.16 mJy/beam. From these non-detections we derive upper limits on their IR luminosity and star formation rate, dust mass, and UV attenuation. Thanks to strong gravitational lensing the limit for Abell1703-zD1 is probing the sub-LIRG regime ($L_IR <8.1 10^10$ Lsun) and very low dust masses ($M_d<1.6 10^7$ Msun). We find that all five galaxies are compatible with the Calzetti IRX-$\beta$ relation, their UV attenuation is compatible with several indirect estimates from other methods (the UV slope, extrapolation of the attenuation measured from the IR/UV ratio at lower redshift, and SED fits), and the dust-to-stellar mass ratio is not incompatible with that of galaxies from z=0 to 3. For their stellar mass the high-z galaxies studied here have an attenuation below the one expected from the mean relation of low redshift (z<1.5) galaxies. More and deeper (sub)-mm data are clearly needed to directly determine the UV attenuation and dust content of the dominant population of high-z star-forming galaxies and to establish more firmly their dependence on stellar mass, redshift, and other properties.

@misc{schaerer2014constraints, abstract = {We have targeted two recently discovered Lyman break galaxies (LBGs) to search for dust continuum and [CII] 158 micron line emission. The strongly lensed z~6.8 LBG A1703-zD1 behind the galaxy cluster Abell 1703, and the spectroscopically confirmed z=7.508 LBG z8-GND-5296 in the GOODS-N field have been observed with the Plateau de Bure interferometer (PdBI) at 1.2mm. These observations have been combined with those of three z>6.5 Lya emitters (named HCM6A, Himiko, and IOK-1), for which deep measurements were recently obtained with the PdBI and ALMA. [CII] is undetected in both galaxies, providing a deep upper limit for Abell1703-zD1, comparable to recent ALMA non-detections. Dust continuum emission from Abell1703-zD1 and z8-GND-5296 is not detected with an rms of 0.12 and 0.16 mJy/beam. From these non-detections we derive upper limits on their IR luminosity and star formation rate, dust mass, and UV attenuation. Thanks to strong gravitational lensing the limit for Abell1703-zD1 is probing the sub-LIRG regime ($L_{IR} <8.1 \times 10^{10}$ Lsun) and very low dust masses ($M_d<1.6 \times 10^7$ Msun). We find that all five galaxies are compatible with the Calzetti IRX-$\beta$ relation, their UV attenuation is compatible with several indirect estimates from other methods (the UV slope, extrapolation of the attenuation measured from the IR/UV ratio at lower redshift, and SED fits), and the dust-to-stellar mass ratio is not incompatible with that of galaxies from z=0 to 3. For their stellar mass the high-z galaxies studied here have an attenuation below the one expected from the mean relation of low redshift (z<1.5) galaxies. More and deeper (sub)-mm data are clearly needed to directly determine the UV attenuation and dust content of the dominant population of high-z star-forming galaxies and to establish more firmly their dependence on stellar mass, redshift, and other properties.}, added-at = {2014-07-23T09:38:47.000+0200}, author = {Schaerer, D. and Boone, F. and Zamojski, M. and Staguhn, J. and Dessauges-Zavadsky, M. and Finkelstein, S. and Combes, F. and Richard, J.}, biburl = {https://www.bibsonomy.org/bibtex/2fd44539e2972a16390883d2df1a5fbce/miki}, description = {[1407.5793] New constraints on dust emission and UV attenuation of z=6.5-7.5 galaxies from IRAM and ALMA observations}, interhash = {f67fd1c62c59aa3a8523493dc3bcf044}, intrahash = {fd44539e2972a16390883d2df1a5fbce}, keywords = {dust emission galaxy high-z}, note = {cite arxiv:1407.5793Comment: 10 pages, 8 figures. Submitted to A&A}, timestamp = {2014-07-23T09:38:47.000+0200}, title = {New constraints on dust emission and UV attenuation of z=6.5-7.5 galaxies from IRAM and ALMA observations}, url = {http://arxiv.org/abs/1407.5793}, year = 2014 }