%0 Generic %1 faisst2016coherent %A Faisst, A. L. %A Capak, P. %A Hsieh, B. C. %A Laigle, C. %A Salvato, M. %A Tasca, L. %A Cassata, P. %A Davidzon, I. %A Ilbert, O. %A Fevre, O. Le %A Masters, D. %A McCracken, H. J. %A Steinhardt, C. %A Silverman, J. D. %A De Barros, S. %A Hasinger, G. %A Scoville, N. Z. %D 2016 %K emission lines redshift sfr %T A Coherent Study of Emission Lines from Broad-Band Photometry: Specific Star-Formation Rates and OIII/H\beta Ratio at 3 < z < 6 %U http://arxiv.org/abs/1601.07173 %X We measure the H\alpha and OIII emission line properties as well as specific star-formation rates (sSFR) of spectroscopically confirmed 3<z<6 galaxies in COSMOS from their observed colors vs. redshift evolution. Our model describes consistently the ensemble of galaxies including intrinsic properties (age, metallicity, star-formation history), dust-attenuation, and optical emission lines. We forward-model the measured H\alpha equivalent-widths (EW) to obtain the sSFR out to z~6 without stellar mass fitting. We find a strongly increasing rest-frame H\alpha EW that is flattening off above z~2.5 with average EWs of 300-600A at z~6. The sSFR is increasing proportional to (1+z)^2.4 at z<2.2 and (1+z)^1.5 at higher redshifts, indicative of a fast mass build-up in high-z galaxies within e-folding times of 100-200Myr at z~6. The redshift evolution at z>3 cannot be fully explained in a picture of cold accretion driven growth. We find a progressively increasing OIIIłambda5007/H\beta ratio out to z~6, consistent with the ratios in local galaxies selected by increasing H\alpha EW (i.e., sSFR). This demonstrates the potential of using "local high-z analogs" to investigate the spectroscopic properties and relations of galaxies in the re-ionization epoch.

@misc{faisst2016coherent, abstract = {We measure the H{\alpha} and [OIII] emission line properties as well as specific star-formation rates (sSFR) of spectroscopically confirmed 3<z<6 galaxies in COSMOS from their observed colors vs. redshift evolution. Our model describes consistently the ensemble of galaxies including intrinsic properties (age, metallicity, star-formation history), dust-attenuation, and optical emission lines. We forward-model the measured H{\alpha} equivalent-widths (EW) to obtain the sSFR out to z~6 without stellar mass fitting. We find a strongly increasing rest-frame H{\alpha} EW that is flattening off above z~2.5 with average EWs of 300-600A at z~6. The sSFR is increasing proportional to (1+z)^2.4 at z<2.2 and (1+z)^1.5 at higher redshifts, indicative of a fast mass build-up in high-z galaxies within e-folding times of 100-200Myr at z~6. The redshift evolution at z>3 cannot be fully explained in a picture of cold accretion driven growth. We find a progressively increasing [OIII]{\lambda}5007/H{\beta} ratio out to z~6, consistent with the ratios in local galaxies selected by increasing H{\alpha} EW (i.e., sSFR). This demonstrates the potential of using "local high-z analogs" to investigate the spectroscopic properties and relations of galaxies in the re-ionization epoch.}, added-at = {2016-01-28T12:20:46.000+0100}, author = {Faisst, A. L. and Capak, P. and Hsieh, B. C. and Laigle, C. and Salvato, M. and Tasca, L. and Cassata, P. and Davidzon, I. and Ilbert, O. and Fevre, O. Le and Masters, D. and McCracken, H. J. and Steinhardt, C. and Silverman, J. D. and De Barros, S. and Hasinger, G. and Scoville, N. Z.}, biburl = {https://www.bibsonomy.org/bibtex/2ad2681a674b5d982ed48d00c6aed3e93/miki}, description = {[1601.07173] A Coherent Study of Emission Lines from Broad-Band Photometry: Specific Star-Formation Rates and [OIII]/H{\beta} Ratio at 3 &lt; z &lt; 6}, interhash = {fcb8be205ef62dd223d0f9a8e5c8efb4}, intrahash = {ad2681a674b5d982ed48d00c6aed3e93}, keywords = {emission lines redshift sfr}, note = {cite arxiv:1601.07173Comment: 18 pages, 11 figures, 3 tables}, timestamp = {2016-01-28T12:20:46.000+0100}, title = {A Coherent Study of Emission Lines from Broad-Band Photometry: Specific Star-Formation Rates and [OIII]/H{\beta} Ratio at 3 < z < 6}, url = {http://arxiv.org/abs/1601.07173}, year = 2016 }