CLEAR: Emission-line Ratios at Cosmic High Noon

被引：37

作者：

Backhaus, Bren E. ^{[1
]}

Trump, Jonathan R. ^{[1
]}

Clen, Nikko J. ^{[1
,2
,3
]}

Simons, Raymond ^{[4
]}

Momcheva, Ivelina ^{[4
]}

Papovich, Casey ^{[2
,3
]}

Estrada-Carpenter, Vicente ^{[2
,3
]}

Finkelstein, Steven L. ^{[5
]}

Matharu, Jasleen ^{[2
,3
]}

Ji, Zhiyuan ^{[6
]}

Weiner, Benjamin ^{[7
]}

Giavalisco, Mauro ^{[6
]}

Jung, Intae ^{[8
,9
]}

机构：

[1] Univ Connecticut, Dept Phys, Storrs, CT 06269 USA

[2] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

[3] Texas A&M Univ, George P & Cynthia Woods Mitchell Inst Fundamenta, College Stn, TX 77843 USA

[4] Spacey Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[5] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

[6] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA

[7] Univ Arizona, Steward Observ, MMT, 933 North Cherry St, Tucson, AZ 85721 USA

[8] Catholic Univ Amer, Dept Phys, Washington, DC 20064 USA

[9] Goddard Space Flight Ctr, Astrophys Sci Div, Greenbelt, MD 20771 USA

来源：

ASTROPHYSICAL JOURNAL | 2022年 / 926卷 / 02期

关键词：

STAR-FORMING GALAXIES; STELLAR POPULATION SYNTHESIS; PHYSICAL CONDITIONS; MOSDEF SURVEY; LUMINOSITY FUNCTION; HOST GALAXIES; CLASSIFICATION; METALLICITIES; EVOLUTION; INSIGHTS;

D O I：

10.3847/1538-4357/ac3919

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use Hubble Space Telescope Wide Field Camera 3 G102 and G141 grism spectroscopy to measure rest-frame optical emission-line ratios of 533 galaxies at z similar to 1.5 in the CANDELS Ly alpha Emission at Reionization survey. We compare [O III]/H beta versus [S II]/(H alpha + [N II]) as an "unVO87" diagram for 461 galaxies and [O III]/H beta versus [Ne III]/[O II] as an "OHNO" diagram for 91 galaxies. The unVO87 diagram does not effectively separate active galactic nuclei (AGN) and [Ne v] sources from star-forming galaxies, indicating that the unVO87 properties of star-forming galaxies evolve with redshift and overlap with AGN emission-line signatures at z > 1. The OHNO diagram does effectively separate X-ray AGN and [Ne v]-emitting galaxies from the rest of the population. We find that the [O III]/H beta line ratios are significantly anticorrelated with stellar mass and significantly correlated with log(L-H beta) <i , while [S II]/(H alpha + [N II]) is significantly anticorrelated with log(L-H beta) <i . Comparison with MAPPINGS V photoionization models indicates that these trends are consistent with lower metallicity and higher ionization in low-mass and high-star formation rate (SFR) galaxies. We do not find evidence for redshift evolution of the emission-line ratios outside of the correlations with mass and SFR. Our results suggest that the OHNO diagram of [O III]/H beta versus [Ne III]/[O II] will be a useful indicator of AGN content and gas conditions in very high-redshift galaxies to be observed by the James Webb Space Telescope.

引用

页数：18

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