2011A&A...526A.149N


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST02:08:22

2011A&A...526A.149N - Astronomy and Astrophysics, volume 526A, 149-149 (2011/2-1)

Metallicity diagnostics with infrared fine-structure lines.

NAGAO T., MAIOLINO R., MARCONI A. and MATSUHARA H.

Abstract (from CDS):

Although measuring the gas metallicity in galaxies at various redshifts is crucial to constrain galaxy evolutionary scenarios, only rest-frame optical emission lines have been generally used to measure the metallicity. This has prevented us to accurately measure the metallicity of dust-obscured galaxies, and accordingly to understand the chemical evolution of dusty populations, such as ultraluminous infrared galaxies. Here we propose diagnostics of the gas metallicity based on infrared fine-structure emission lines, which are nearly unaffected by dust extinction even the most obscured systems. Specifically, we focus on fine-structure lines arising mostly from HII regions, not in photo-dissociation regions, to minimize the dependence and uncertainties of the metallicity diagnostics from various physical parameters. Based on photoionization models, we show that the emission-line flux ratio of ([OIII]51.80+[OIII]88.33)/[NIII]57.21 is an excellent tracer of the gas metallicity. The individual line ratios [OIII]51.80/[NIII]57.21 or [OIII]88.33/[NIII]57.21 can also be used as diagnostics of the metallicity, but they are more strongly dependent on the gas density. The line ratios [OIII]88.33/[OIII]51.80 and [NII]121.7/[NIII]57.21 can be used to measure and, therefore, account for the dependences on the gas density and ionization parameter, respectively. We show that these diagnostic fine-structure lines are detectable with Herschel in luminous infrared galaxies out z∼0.4. Metallicity measurements with these fine-structure lines will be feasible at relatively high redshift (z∼1 or more) with SPICA, the future infrared space observatory.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: evolution - galaxies: ISM - HII regions - infrared: galaxies - infrared: ISM

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5331 6
2 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1555 0
3 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3781 4

    Equat.    Gal    SGal    Ecl

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2020.07.04-02:08:22

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