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

Vale Asari, N.; Couto, G. S.; Cid Fernandes, R.; Stasińska, G.; de Amorim, A. L.; Ruschel-Dutra, D.; Werle, A.; Florido, T. Z.

doi:10.1093/mnras/stz2470

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

Journal Article · 04 September 2019 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stz2470 · OSTI ID:1564335

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^[3];

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^[3];

^[5]; Florido, T. Z. ^[3]

Departamento de Física–CFM, Universidade Federal de Santa Catarina, C.P. 476, 88040-900 Florianópolis, SC, Brazil, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, UK
Departamento de Física–CFM, Universidade Federal de Santa Catarina, C.P. 476, 88040-900 Florianópolis, SC, Brazil, Centro de Astronomía (CITEVA), Universidad de Antofagasta, Avenida Angamos 601, Antofagasta, 02800, Chile
Departamento de Física–CFM, Universidade Federal de Santa Catarina, C.P. 476, 88040-900 Florianópolis, SC, Brazil
LUTH, CNRS, Observatoire de Paris, PSL University, F-92195, France
Departamento de Física–CFM, Universidade Federal de Santa Catarina, C.P. 476, 88040-900 Florianópolis, SC, Brazil, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, R. do Matão 1226, 05508-090 São Paulo, Brazil

ABSTRACT 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 α equivalent width (WH α). 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 WH α ≳ 10 Å (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 $$\, \gt 90\, 000$$ 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 β)/([N ii]/H α) index, but reaches ∼0.1 dex at the high-metallicity end for [N ii]/H α. (2) This result is based on the ∼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]/Hα index, O/H increases with SFR at high stellar mass, contrary to previous claims.

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Sponsoring Organization:: USDOE

OSTI ID:: 1564335

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 4 Vol. 489; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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