The S2N2 metallicity calibrator and the abundance gradient of M 33
arXiv:0708.2178 · doi:10.1111/j.1365-2966.2007.12357.x
Abstract
We introduce the log(Ha/[SII]6717+6731) vs. log(Ha/[NII]6583) (S2N2) diagnostic diagram as metallicity and ionisation parameter indicator for HII regions in external galaxies. The location of HII regions in the S2N2 diagram was studied both empirically and theoretically. We found that, for a wide range of metallicities, the S2N2 diagram gives single valued results in the metallicity-ionisation parameter plane. We demonstrate that the S2N2 diagram is a powerful tool to estimate metallicities of high-redshift (z ~ 2) HII galaxies. Finally, we derive the metallicity for 76 HII regions in M33 from the S2N2 diagram and calculate an O/H abundance gradient for this galaxy of -0.05 (+-0.01) dex kpc^-1.
10 pages, 3 figures and 2 tables. Accepted for publication in MNRAS
References in corpus (4)
- Emission-line Diagnostics of Low Metallicity AGN
- The metallicity gradient of M 33: chemical abundances of HII regions
- [ArIII]/[OIII] and [SIII]/[OIII]: well-behaved oxygen abundance indicators for HII regions and star forming galaxies
- Detection of Beat Cepheids in M33 and Their Use as a Probe of the M33 Metallicity Distribution
Cited by in corpus (8)
- Integral field spectroscopy of nearby QSOs: I. ENLR size-luminosity relation, ongoing star formation & resolved gas-phase metallicities
- Lick Indices in the Thin and Thick Disks of Edge-On Disk Galaxies
- The Close AGN Reference Survey (CARS). A massive multi-phase outflow impacting the edge-on galaxy HE1353-1917
- Ages and metallicities of circumnuclear star formation regions from Gemini IFU observations
- Far-Infrared Line Diagnostics: Improving N/O Abundance Estimates for Dusty Galaxies
- Discovery of a Dusty, Chemically Mature Companion to a z4 Starburst Galaxy in JWST ERS Data
- The Gaia-ESO Survey: dynamics of ionized and neutral gas in the Lagoon nebula (M8)
- New calibrations for estimating the N/O ratio in HII regions