Diffuse ionized gas and its effects on nebular metallicity estimates of star-forming galaxies

被引：44

作者：

Vale Asari, N. ^{[1
,2
]}

Couto, G. S. ^{[1
,3
]}

Cid Fernandes, R. ^{[1
]}

Stasinska, G. ^{[4
]}

de Amorim, A. L. ^{[1
]}

Ruschel-Dutra, D. ^{[1
]}

Werle, A. ^{[1
,5
]}

Florido, T. Z. ^{[1
]}

机构：

[1] Univ Fed Santa Catarina, CFM, Dept Fis, BR-88040900 Florianopolis, SC, Brazil

[2] Univ St Andrews, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland

[3] Univ Antofagasta, Ctr Astron CITEVA, Ave Angamos 601, Antofagasta 02800, Chile

[4] PSL Univ, Observ Paris, CNRS, LUTH, F-92195 Paris, France

[5] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, R Matao 1226, BR-05508090 Sao Paulo, Brazil

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 489卷 / 04期

基金：

美国国家科学基金会; 美国国家航空航天局; 巴西圣保罗研究基金会; 美国安德鲁·梅隆基金会; 瑞典研究理事会;

关键词：

ISM: abundances; galaxies: abundances; galaxies: ISM; DIGITAL SKY SURVEY; SPECTROSCOPIC TARGET SELECTION; EVOLUTIONARY SEQUENCES; STELLAR MODELS; RADIATIVE OPACITIES; SEMIEMPIRICAL ANALYSIS; DIAGNOSTIC DIAGRAMS; DATA RELEASE; MASS; POPULATION;

D O I：

10.1093/mnras/stz2470

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the impact of the diffuse ionized gas (DIG) on abundance determinations in star-forming (SF) galaxies. The DIG is characterized using the H alpha equivalent width (W-H alpha). From a set of 1 409 SF galaxies from the Mapping Nearby Galaxies at APO (MaNGA) survey, we calculate the fractional contribution of the DIG to several emission lines using high-S/N data from SF spaxels (instead of using noisy emission-lines in DIG-dominated spaxels). Our method is applicable to spectra with observed W-H alpha greater than or similar to 10 angstrom (which are not dominated by DIG emission). Since the DIG contribution depends on galactocentric distance, we provide DIG-correction formulae for both entire galaxies and single aperture spectra. Applying those to a sample of > 90 000 SF galaxies from the Sloan Digital Sky Survey, we find the following. (1) The effect of the DIG on strong-line abundances depends on the index used. It is negligible for the ([O III]/H ss)/([N II]/H alpha) index, but reaches similar to 0.1 dex at the high-metallicity end for [N II]/H alpha. (2) This result is based on the similar to kpc MaNGA resolution, so the real effect of the DIG is likely greater. (3) We revisit the mass-metallicity-star formation rate (SFR) relation by correcting for the DIG contribution in both abundances and SFR. The effect of DIG removal is more prominent at higher stellar masses. Using the [N II]/H alpha index, O/H increases with SFR at high stellar mass, contrary to previous claims.

引用

页码：4721 / 4733

页数：13

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