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The DOI matches its Crossref record; 84 of the 84 references it cites were found in a registry or an index.

STRONG NEBULAR LINE RATIOS IN THE SPECTRA of z∼ 2-3 STAR FORMING GALAXIES: FIRST RESULTS FROM KBSS-MOSFIRE

Open access
Steidel, Charles C., Rudie, Gwen C., Strom, Allison L., Pettini, Max, Reddy, Naveen A., Shapley, Alice E., Trainor, Ryan F., Erb, Dawn K., Turner, Monica L., Konidaris, Nicholas P., Kulas, Kristin R., Mace, Gregory, Matthews, Keith, McLean, Ian S.·2014·The Astrophysical Journal
DOI 10.1088/0004-637x/795/2/165
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Abstract

We present initial results of a deep near-IR spectroscopic survey covering the 15 fields of the Keck Baryonic Structure Survey using the recently commissioned MOSFIRE spectrometer on the Keck 1 telescope. We focus on a sample of 251 galaxies with redshifts 2.0 < z < 2.6, star formation rates (SFRs) 2 ≲ SFR ≲ 200 M ☉ yr −1 , and stellar masses 8.6 < log ( M * / M ☉ ) < 11.4, with high-quality spectra in both H- and K -band atmospheric windows. We show unambiguously that the locus of z ∼ 2.3 galaxies in the "BPT" nebular diagnostic diagram exhibits an almost entirely disjointed, yet similarly tight, relationship between the line ratios [N ii ] λ6585/Hα and [O iii ]/Hβ as compared to local galaxies. Using photoionization models, we argue that the offset of the z ∼ 2.3 BPT locus relative to that at z ∼ 0 is caused by a combination of harder stellar ionizing radiation field, higher ionization parameter, and higher N/O at a given O/H compared to most local galaxies, and that the position of a galaxy along the z ∼ 2.3 star-forming BPT locus is surprisingly insensitive to gas-phase oxygen abundance. The observed nebular emission line ratios are most easily reproduced by models in which the net stellar ionizing radiation field resembles a blackbody with effective temperature T eff = 50, 000–60, 000 K, the gas-phase oxygen abundances lie in the range 0.2 < Z / Z ☉ < 1.0, and the ratio of gas-phase N/O is close to the solar value. We critically assess the applicability at high redshift of commonly used strong line indices for estimating gas-phase metallicity, and consider the implications of the small intrinsic scatter of the empirical relationship between excitation-sensitive line indices and M * (i.e., the "mass–metallicity" relation) at z ≃ 2.3.

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Metadata

Authors
Steidel, C. C., Rudie, G. C., Strom, A. L., Pettini, M., Reddy, N. A., Shapley, A. E., Trainor, R. F., Erb, D. K., Turner, M. L., Konidaris, N. P., Kulas, K. R., Mace, G., Matthews, K., & McLean, I. S.
Venue
The Astrophysical Journal
Publisher
American Astronomical Society
Published
2014-10-28
Volume
795
Issue
2
Pages
165
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
DOI
10.1088/0004-637x/795/2/165
OpenAlex
W1993307583
Cited by
623
References
84
FWCI
36.19
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: STRONG NEBULAR LINE RATIOS IN THE SPECTRA of z∼ 2-3 STAR FORMING GALAXIES: FIRST RESULTS FROM KBSS-MOSFIRE. https://app.cochat.ai/papers/10.1088/0004-637x/795/2/165
The paper
Steidel, C. C., Rudie, G. C., Strom, A. L., Pettini, M., Reddy, N. A., Shapley, A. E., Trainor, R. F., Erb, D. K., Turner, M. L., Konidaris, N. P., Kulas, K. R., Mace, G., Matthews, K., & McLean, I. S. (2014). STRONG NEBULAR LINE RATIOS IN THE SPECTRA of z∼ 2-3 STAR FORMING GALAXIES: FIRST RESULTS FROM KBSS-MOSFIRE. The Astrophysical Journal. https://doi.org/10.1088/0004-637x/795/2/165

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.