%0 Generic %1 lee2012probing %A Lee, Kyoung-Soo %A Dey, Arjun %A Cooper, Michael C. %A Reddy, Naveen %A Jannuzi, Buell T. %D 2012 %K absorption bright lbgs winds %T Probing High-Redshift Galaxy Formation at the Highest Luminosities: New Insights from DEIMOS Spectroscopy %U http://arxiv.org/abs/1212.4835 %X We present DEIMOS spectroscopic observations of the most UV-luminous star-forming galaxies at 3.2<z<4.6. Our sample contains galaxies with luminosities of L*<L<7L* and is one of the largest samples to date of the most UV-luminous galaxies at these redshifts. Our data confirm 41 star-forming galaxies at 3.2<z<4.6 and validate the clean selection of the photometric candidates. We find that the fraction of Lya emitting galaxies increases with decreasing UV luminosity. We find strong evidence of large-scale outflows, transporting the neutral/ionized gas in the interstellar medium away from the galaxy. Galaxies exhibiting both interstellar absorption and Lya emission lines show a significant velocity offset between the two features (200-1140 km/s). We find tentative evidence that this measure of the outflow velocity increases with UV luminosity and/or stellar mass. The luminosity- and mass-dependent outflow strengths suggest that the efficiency of feedback and enrichment of the surrounding medium depend on these parameters. We present composite spectra of the absorption-line-only and Lya-emitting subsets of the UV luminous galaxies at z~3.7. The composite spectra are similar to those of lower-z and lower-luminosity LBGs samples, but with some subtle differences. Analyses of the composite spectra suggest that the UV luminous LBGs at z~3.7 may have a higher covering fraction of absorbing gas, and may be older than their lower-z and lower-luminosity counterparts. In addition, we have discovered 5 galaxies that belong to a massive overdensity at z=3.78. Finally, two galaxies each show two distinct sets of interstellar absorption features. The latter may be a sign of a final stage of major merger, or clumpy disk formation. Their presence implies that frequency of such sources among our luminous z~3.7 LBGs may be an order of magnitude higher than in lower redshift and lower luminosity samples.

@misc{lee2012probing, abstract = {We present DEIMOS spectroscopic observations of the most UV-luminous star-forming galaxies at 3.2<z<4.6. Our sample contains galaxies with luminosities of L*<L<7L* and is one of the largest samples to date of the most UV-luminous galaxies at these redshifts. Our data confirm 41 star-forming galaxies at 3.2<z<4.6 and validate the clean selection of the photometric candidates. We find that the fraction of Lya emitting galaxies increases with decreasing UV luminosity. We find strong evidence of large-scale outflows, transporting the neutral/ionized gas in the interstellar medium away from the galaxy. Galaxies exhibiting both interstellar absorption and Lya emission lines show a significant velocity offset between the two features (200-1140 km/s). We find tentative evidence that this measure of the outflow velocity increases with UV luminosity and/or stellar mass. The luminosity- and mass-dependent outflow strengths suggest that the efficiency of feedback and enrichment of the surrounding medium depend on these parameters. We present composite spectra of the absorption-line-only and Lya-emitting subsets of the UV luminous galaxies at z~3.7. The composite spectra are similar to those of lower-z and lower-luminosity LBGs samples, but with some subtle differences. Analyses of the composite spectra suggest that the UV luminous LBGs at z~3.7 may have a higher covering fraction of absorbing gas, and may be older than their lower-z and lower-luminosity counterparts. In addition, we have discovered 5 galaxies that belong to a massive overdensity at z=3.78. Finally, two galaxies each show two distinct sets of interstellar absorption features. The latter may be a sign of a final stage of major merger, or clumpy disk formation. Their presence implies that frequency of such sources among our luminous z~3.7 LBGs may be an order of magnitude higher than in lower redshift and lower luminosity samples.}, added-at = {2012-12-22T10:11:29.000+0100}, author = {Lee, Kyoung-Soo and Dey, Arjun and Cooper, Michael C. and Reddy, Naveen and Jannuzi, Buell T.}, biburl = {https://www.bibsonomy.org/bibtex/27b80631dc66afefc2192b374aa53e4ca/miki}, description = {[1212.4835] Probing High-Redshift Galaxy Formation at the Highest Luminosities: New Insights from DEIMOS Spectroscopy}, interhash = {c86a9bf5ce42d9fd7d6438bcbd33c1e0}, intrahash = {7b80631dc66afefc2192b374aa53e4ca}, keywords = {absorption bright lbgs winds}, note = {cite arxiv:1212.4835Comment: 19 pages, 12 figures, submitted to Astrophysical Journal, comments welcome}, timestamp = {2012-12-22T10:11:30.000+0100}, title = {Probing High-Redshift Galaxy Formation at the Highest Luminosities: New Insights from DEIMOS Spectroscopy}, url = {http://arxiv.org/abs/1212.4835}, year = 2012 }