@article{strom_measuring_2017,
	title = {Measuring the {Physical} {Conditions} in {High}-{Redshift} {Star}-{Forming} {Galaxies}: {Insights} from {KBSS}-{MOSFIRE}},
	volume = {1711},
	shorttitle = {Measuring the {Physical} {Conditions} in {High}-{Redshift} {Star}-{Forming} {Galaxies}},
	url = {http://adsabs.harvard.edu/abs/2017arXiv171108820S},
	abstract = {We use photoionization models designed to reconcile the joint 
rest-UV-optical spectra of high-z star-forming galaxies to
self-consistently infer the gas chemistry and nebular ionization and
excitation conditions for {\textasciitilde}160 galaxies from the Keck Baryonic Structure
Survey (KBSS), using only observations of their rest-optical nebular
spectra. We find that the majority of z{\textasciitilde}2-3 KBSS galaxies are moderately
O-rich, with an interquartile range in 12+log(O/H)=8.29-8.55, and have
significantly sub-solar Fe enrichment, with an interquartile range of
[Fe/H]=[-0.82,-0.54], contributing additional evidence in favor of
super-solar O/Fe in high-z galaxies. Ionization parameter and N/O, as
determined through comparisons with the photoionization models, are
strongly correlated with common strong-line indices (such as O32 and
N2O2), whereas diagnostics commonly used for measuring gas-phase O/H
(such as N2 and O3N2) are relatively insensitive to the overall amount
of oxygen present in the gas. We provide a new calibration using R23 to
measure O/H in typical high-z galaxies, although it is most useful for
relatively O-rich galaxies; combining O32 and R23 does not yield a more
effective calibration. Finally, we consider implications for the
intrinsic correlations between physical conditions across the galaxy
sample and find that N/O varies with O/H in high-z galaxies in a manner
almost identical to local extragalactic HII regions. In contrast, we do
not find a strong anti-correlation between ionization parameter and
metallicity (O/H or Fe/H) in high-z galaxies, which is one of the
principal bases for using strong-line ratios to infer oxygen abundance.},
	urldate = {2017-12-11},
	journal = {ArXiv e-prints},
	author = {Strom, Allison L. and Steidel, Charles C. and Rudie, Gwen C. and Trainor, Ryan F. and Pettini, Max},
	month = nov,
	year = {2017},
	keywords = {Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics},
	pages = {arXiv:1711.08820},
}

{"_id":"g7xkZxAKZ7byJu6jT","bibbaseid":"strom-steidel-rudie-trainor-pettini-measuringthephysicalconditionsinhighredshiftstarforminggalaxiesinsightsfromkbssmosfire-2017","author_short":["Strom, A. L.","Steidel, C. C.","Rudie, G. C.","Trainor, R. F.","Pettini, M."],"bibdata":{"bibtype":"article","type":"article","title":"Measuring the Physical Conditions in High-Redshift Star-Forming Galaxies: Insights from KBSS-MOSFIRE","volume":"1711","shorttitle":"Measuring the Physical Conditions in High-Redshift Star-Forming Galaxies","url":"http://adsabs.harvard.edu/abs/2017arXiv171108820S","abstract":"We use photoionization models designed to reconcile the joint rest-UV-optical spectra of high-z star-forming galaxies to self-consistently infer the gas chemistry and nebular ionization and excitation conditions for \\textasciitilde160 galaxies from the Keck Baryonic Structure Survey (KBSS), using only observations of their rest-optical nebular spectra. We find that the majority of z\\textasciitilde2-3 KBSS galaxies are moderately O-rich, with an interquartile range in 12+log(O/H)=8.29-8.55, and have significantly sub-solar Fe enrichment, with an interquartile range of [Fe/H]=[-0.82,-0.54], contributing additional evidence in favor of super-solar O/Fe in high-z galaxies. Ionization parameter and N/O, as determined through comparisons with the photoionization models, are strongly correlated with common strong-line indices (such as O32 and N2O2), whereas diagnostics commonly used for measuring gas-phase O/H (such as N2 and O3N2) are relatively insensitive to the overall amount of oxygen present in the gas. We provide a new calibration using R23 to measure O/H in typical high-z galaxies, although it is most useful for relatively O-rich galaxies; combining O32 and R23 does not yield a more effective calibration. Finally, we consider implications for the intrinsic correlations between physical conditions across the galaxy sample and find that N/O varies with O/H in high-z galaxies in a manner almost identical to local extragalactic HII regions. In contrast, we do not find a strong anti-correlation between ionization parameter and metallicity (O/H or Fe/H) in high-z galaxies, which is one of the principal bases for using strong-line ratios to infer oxygen abundance.","urldate":"2017-12-11","journal":"ArXiv e-prints","author":[{"propositions":[],"lastnames":["Strom"],"firstnames":["Allison","L."],"suffixes":[]},{"propositions":[],"lastnames":["Steidel"],"firstnames":["Charles","C."],"suffixes":[]},{"propositions":[],"lastnames":["Rudie"],"firstnames":["Gwen","C."],"suffixes":[]},{"propositions":[],"lastnames":["Trainor"],"firstnames":["Ryan","F."],"suffixes":[]},{"propositions":[],"lastnames":["Pettini"],"firstnames":["Max"],"suffixes":[]}],"month":"November","year":"2017","keywords":"Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics","pages":"arXiv:1711.08820","bibtex":"@article{strom_measuring_2017,\n\ttitle = {Measuring the {Physical} {Conditions} in {High}-{Redshift} {Star}-{Forming} {Galaxies}: {Insights} from {KBSS}-{MOSFIRE}},\n\tvolume = {1711},\n\tshorttitle = {Measuring the {Physical} {Conditions} in {High}-{Redshift} {Star}-{Forming} {Galaxies}},\n\turl = {http://adsabs.harvard.edu/abs/2017arXiv171108820S},\n\tabstract = {We use photoionization models designed to reconcile the joint \nrest-UV-optical spectra of high-z star-forming galaxies to\nself-consistently infer the gas chemistry and nebular ionization and\nexcitation conditions for {\\textasciitilde}160 galaxies from the Keck Baryonic Structure\nSurvey (KBSS), using only observations of their rest-optical nebular\nspectra. We find that the majority of z{\\textasciitilde}2-3 KBSS galaxies are moderately\nO-rich, with an interquartile range in 12+log(O/H)=8.29-8.55, and have\nsignificantly sub-solar Fe enrichment, with an interquartile range of\n[Fe/H]=[-0.82,-0.54], contributing additional evidence in favor of\nsuper-solar O/Fe in high-z galaxies. Ionization parameter and N/O, as\ndetermined through comparisons with the photoionization models, are\nstrongly correlated with common strong-line indices (such as O32 and\nN2O2), whereas diagnostics commonly used for measuring gas-phase O/H\n(such as N2 and O3N2) are relatively insensitive to the overall amount\nof oxygen present in the gas. We provide a new calibration using R23 to\nmeasure O/H in typical high-z galaxies, although it is most useful for\nrelatively O-rich galaxies; combining O32 and R23 does not yield a more\neffective calibration. Finally, we consider implications for the\nintrinsic correlations between physical conditions across the galaxy\nsample and find that N/O varies with O/H in high-z galaxies in a manner\nalmost identical to local extragalactic HII regions. In contrast, we do\nnot find a strong anti-correlation between ionization parameter and\nmetallicity (O/H or Fe/H) in high-z galaxies, which is one of the\nprincipal bases for using strong-line ratios to infer oxygen abundance.},\n\turldate = {2017-12-11},\n\tjournal = {ArXiv e-prints},\n\tauthor = {Strom, Allison L. and Steidel, Charles C. and Rudie, Gwen C. and Trainor, Ryan F. and Pettini, Max},\n\tmonth = nov,\n\tyear = {2017},\n\tkeywords = {Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics},\n\tpages = {arXiv:1711.08820},\n}\n\n","author_short":["Strom, A. L.","Steidel, C. C.","Rudie, G. C.","Trainor, R. F.","Pettini, M."],"key":"strom_measuring_2017","id":"strom_measuring_2017","bibbaseid":"strom-steidel-rudie-trainor-pettini-measuringthephysicalconditionsinhighredshiftstarforminggalaxiesinsightsfromkbssmosfire-2017","role":"author","urls":{"Paper":"http://adsabs.harvard.edu/abs/2017arXiv171108820S"},"keyword":["Astrophysics - Astrophysics of Galaxies","Astrophysics - Cosmology and Nongalactic Astrophysics"],"metadata":{"authorlinks":{}}},"bibtype":"article","biburl":"https://bibbase.org/zotero/polyphant","dataSources":["7gvjSdWrEu7z5vjjj"],"keywords":["astrophysics - astrophysics of galaxies","astrophysics - cosmology and nongalactic astrophysics"],"search_terms":["measuring","physical","conditions","high","redshift","star","forming","galaxies","insights","kbss","mosfire","strom","steidel","rudie","trainor","pettini"],"title":"Measuring the Physical Conditions in High-Redshift Star-Forming Galaxies: Insights from KBSS-MOSFIRE","year":2017}