%0 Generic %1 amorin2017analogs %A Amorín, Ricardo %A Fontana, A. %A Pérez-Montero, E. %A Castellano, M. %A Guaita, L. %A Grazian, A. %A Fèvre, O. Le %A Ribeiro, B. %A Schaerer, D. %A Tasca, L. A. M. %A Thomas, R. %A Bardelli, S. %A Cassarà, L. %A Cassata, P. %A Cimatti, A. %A Contini, T. %A de Barros, S. %A Garilli, B. %A Giavalisco, M. %A Hathi, N. %A Koekemoer, A. %A Brun, V. Le %A Lemaux, B. C. %A Maccagni, D. %A Pentericci, L. %A Pforr, J. %A Talia, M. %A Tresse, L. %A Vanzella, E. %A Vergani, D. %A Zamorani, G. %A Zucca, E. %A Merlin, E. %D 2017 %K analogues galaxies high redshift %T Analogs of primeval galaxies two billion years after the Big Bang %U http://arxiv.org/abs/1701.04416 %X Deep observations are revealing a growing number of young galaxies in the first billion year of cosmic time. Compared to typical galaxies at later times, they show more extreme emission-line properties, higher star formation rates, lower masses, and smaller sizes. However, their faintness precludes studies of their chemical abundances and ionization conditions, strongly limiting our understanding of the physics driving early galaxy build-up and metal enrichment. Here we study a rare population of UV-selected, sub$-L^*$(z=3) galaxies at redshift 2.4$<z<$3.5 that exhibit all the rest-frame properties expected from primeval galaxies. These low-mass, highly-compact systems are rapidly-forming galaxies able to double their stellar mass in only few tens million years. They are characterized by very blue UV spectra with weak absorption features and bright nebular emission lines, which imply hard radiation fields from young hot massive stars. Their highly-ionized gas phase has strongly sub-solar carbon and oxygen abundances, with metallicities more than a factor of two lower than that found in typical galaxies of similar mass and star formation rate at $złesssim$2.5. These young galaxies reveal an early and short stage in the assembly of their galactic structures and their chemical evolution, a vigorous phase which is likely to be dominated by the effects of gas-rich mergers, accretion of metal-poor gas and strong outflows.

@misc{amorin2017analogs, abstract = {Deep observations are revealing a growing number of young galaxies in the first billion year of cosmic time. Compared to typical galaxies at later times, they show more extreme emission-line properties, higher star formation rates, lower masses, and smaller sizes. However, their faintness precludes studies of their chemical abundances and ionization conditions, strongly limiting our understanding of the physics driving early galaxy build-up and metal enrichment. Here we study a rare population of UV-selected, sub$-L^{*}$(z=3) galaxies at redshift 2.4$<z<$3.5 that exhibit all the rest-frame properties expected from primeval galaxies. These low-mass, highly-compact systems are rapidly-forming galaxies able to double their stellar mass in only few tens million years. They are characterized by very blue UV spectra with weak absorption features and bright nebular emission lines, which imply hard radiation fields from young hot massive stars. Their highly-ionized gas phase has strongly sub-solar carbon and oxygen abundances, with metallicities more than a factor of two lower than that found in typical galaxies of similar mass and star formation rate at $z\lesssim$2.5. These young galaxies reveal an early and short stage in the assembly of their galactic structures and their chemical evolution, a vigorous phase which is likely to be dominated by the effects of gas-rich mergers, accretion of metal-poor gas and strong outflows.}, added-at = {2017-01-18T10:50:10.000+0100}, author = {Amorín, Ricardo and Fontana, A. and Pérez-Montero, E. and Castellano, M. and Guaita, L. and Grazian, A. and Fèvre, O. Le and Ribeiro, B. and Schaerer, D. and Tasca, L. A. M. and Thomas, R. and Bardelli, S. and Cassarà, L. and Cassata, P. and Cimatti, A. and Contini, T. and de Barros, S. and Garilli, B. and Giavalisco, M. and Hathi, N. and Koekemoer, A. and Brun, V. Le and Lemaux, B. C. and Maccagni, D. and Pentericci, L. and Pforr, J. and Talia, M. and Tresse, L. and Vanzella, E. and Vergani, D. and Zamorani, G. and Zucca, E. and Merlin, E.}, biburl = {https://www.bibsonomy.org/bibtex/2332fe3e3ebc4d3a34d6b6f90773bf172/miki}, description = {[1701.04416] Analogs of primeval galaxies two billion years after the Big Bang}, interhash = {3986946a8b76b5ab8ba4599e2e6e8654}, intrahash = {332fe3e3ebc4d3a34d6b6f90773bf172}, keywords = {analogues galaxies high redshift}, note = {cite arxiv:1701.04416Comment: 25 pages, 8 figs, 2 tables. Accepted for publication}, timestamp = {2017-01-18T10:50:10.000+0100}, title = {Analogs of primeval galaxies two billion years after the Big Bang}, url = {http://arxiv.org/abs/1701.04416}, year = 2017 }