%0 Generic %1 maiolino2015assembly %A Maiolino, R. %A Carniani, S. %A Fontana, A. %A Vallini, L. %A Pentericci, L. %A Ferrara, A. %A Vanzella, E. %A Grazian, A. %A Gallerani, S. %A Castellano, M. %A Cristiani, S. %A Brammer, G. %A Santini, P. %A Wagg, J. %A Williams, R. %D 2015 %K [CII] alma high-z %T The assembly of "normal" galaxies at z=7 probed by ALMA %U http://arxiv.org/abs/1502.06634 %X We report new deep ALMA observations aimed at investigating the CII158um line and continuum emission in three spectroscopically confirmed Lyman Break Galaxies at 6.8<z<7.1, i.e. well within the re-ionization epoch. With Star Formation Rates of SFR ~ 10 Msun/yr these systems are more representative of the high-z galaxy population than the extreme ones targeted in the past by millimeter observations. At the location of the optical emission, tracing both the Lyalpha line and the far-UV continuum, no CII emission is detected. However, for the galaxy with the deepest observation we detect CII emission at redshift z=7.107, fully consistent with the Lyalpha redshift, but spatially offset by 0.7" (4 kpc) from the optical emission. These results support expectations from recent models that molecular clouds in the central parts of primordial galaxies are rapidly disrupted by stellar feedback. As a result, CII emission mostly arises from more external accreting/satellite clumps of neutral gas. Thermal far-infrared continuum is not detected in any of the three galaxies. However, the upper limits on the infrared-to-UV emission ratio do not exceed those derived in metal- and dust-poor galaxies.

@misc{maiolino2015assembly, abstract = {We report new deep ALMA observations aimed at investigating the [CII]158um line and continuum emission in three spectroscopically confirmed Lyman Break Galaxies at 6.8<z<7.1, i.e. well within the re-ionization epoch. With Star Formation Rates of SFR ~ 10 Msun/yr these systems are more representative of the high-z galaxy population than the extreme ones targeted in the past by millimeter observations. At the location of the optical emission, tracing both the Lyalpha line and the far-UV continuum, no [CII] emission is detected. However, for the galaxy with the deepest observation we detect [CII] emission at redshift z=7.107, fully consistent with the Lyalpha redshift, but spatially offset by 0.7" (4 kpc) from the optical emission. These results support expectations from recent models that molecular clouds in the central parts of primordial galaxies are rapidly disrupted by stellar feedback. As a result, [CII] emission mostly arises from more external accreting/satellite clumps of neutral gas. Thermal far-infrared continuum is not detected in any of the three galaxies. However, the upper limits on the infrared-to-UV emission ratio do not exceed those derived in metal- and dust-poor galaxies.}, added-at = {2015-02-25T09:55:01.000+0100}, author = {Maiolino, R. and Carniani, S. and Fontana, A. and Vallini, L. and Pentericci, L. and Ferrara, A. and Vanzella, E. and Grazian, A. and Gallerani, S. and Castellano, M. and Cristiani, S. and Brammer, G. and Santini, P. and Wagg, J. and Williams, R.}, biburl = {https://www.bibsonomy.org/bibtex/27f3f52a5543c8869d90b203d1bc71d33/miki}, description = {[1502.06634] The assembly of "normal" galaxies at z=7 probed by ALMA}, interhash = {864a7c7b8d7ee8bfc73889f85ae404d6}, intrahash = {7f3f52a5543c8869d90b203d1bc71d33}, keywords = {[CII] alma high-z}, note = {cite arxiv:1502.06634Comment: 13 pages, 8 figures, 3 tables, submitted to MNRAS}, timestamp = {2015-02-25T09:55:01.000+0100}, title = {The assembly of "normal" galaxies at z=7 probed by ALMA}, url = {http://arxiv.org/abs/1502.06634}, year = 2015 }