%0 Generic %1 cullen2016changing %A Cullen, F. %A Cirasuolo, M. %A Kewley, L. J. %A McLure, R. J. %A Dunlop, J. S. %A Bowler, R. A. A. %D 2016 %K emission evolution forming galaxies line redshift star %T Changing physical conditions in star-forming galaxies between redshifts 0 < z < 4: OIII/Hb evolution %U http://arxiv.org/abs/1605.04228 %X We investigate the redshift evolution of the OIII/Hb nebular emission line ratio for a sample of galaxies spanning the redshift range 0 < z < 4. We compare the observed evolution to a set of theoretical models which account for the independent evolution of chemical abundance, ionization parameter and interstellar-medium (ISM) pressure in star-forming galaxies with redshift. Accounting for selection effects in the combined datasets, we show that the evolution to higher OIII/Hb ratios with redshift is a real physical effect which is best accounted for by a model in which the ionization parameter is elevated from the average values typical of local star-forming galaxies, with a possible simultaneous increase in the ISM pressure. We rule out the possibility that the observed OIII/Hb evolution is purely due to metallicity evolution. We discuss the implications of these results for using local empirical metallicity calibrations to measure metallicities at high redshift, and briefly discuss possible theoretical implications of our results.

@misc{cullen2016changing, abstract = {We investigate the redshift evolution of the [OIII]/Hb nebular emission line ratio for a sample of galaxies spanning the redshift range 0 < z < 4. We compare the observed evolution to a set of theoretical models which account for the independent evolution of chemical abundance, ionization parameter and interstellar-medium (ISM) pressure in star-forming galaxies with redshift. Accounting for selection effects in the combined datasets, we show that the evolution to higher [OIII]/Hb ratios with redshift is a real physical effect which is best accounted for by a model in which the ionization parameter is elevated from the average values typical of local star-forming galaxies, with a possible simultaneous increase in the ISM pressure. We rule out the possibility that the observed [OIII]/Hb evolution is purely due to metallicity evolution. We discuss the implications of these results for using local empirical metallicity calibrations to measure metallicities at high redshift, and briefly discuss possible theoretical implications of our results.}, added-at = {2016-05-16T09:58:02.000+0200}, author = {Cullen, F. and Cirasuolo, M. and Kewley, L. J. and McLure, R. J. and Dunlop, J. S. and Bowler, R. A. A.}, biburl = {https://www.bibsonomy.org/bibtex/2323151ef0d39730a2aa28be6ba741f27/miki}, description = {[1605.04228] Changing physical conditions in star-forming galaxies between redshifts 0 &lt; z &lt; 4: [OIII]/Hb evolution}, interhash = {370602893d95bf43f0ee3235b19cf88c}, intrahash = {323151ef0d39730a2aa28be6ba741f27}, keywords = {emission evolution forming galaxies line redshift star}, note = {cite arxiv:1605.04228Comment: 13 pages, 5 figures, accepted for publication in MNRAS}, timestamp = {2016-05-16T09:58:02.000+0200}, title = {Changing physical conditions in star-forming galaxies between redshifts 0 < z < 4: [OIII]/Hb evolution}, url = {http://arxiv.org/abs/1605.04228}, year = 2016 }