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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 720140.0, MPI für Astronomie / Publikationen_mpia
Red supergiants as cosmic abundance probes: The first direct metallicity determination of NGC 4038 in the antennae
Authors:Lardo, C.; Davies, B.; Kudritzki, R. -. P.; Gazak, J. Z.; Evans, C. J.; Patrick, L. R.; Bergemann, M.; Plez, B.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:The Astrophysical Journal
Issue / Number:2
Start Page:id. 160 (8 pp)
Audience:Not Specified
Abstract / Description:We present a direct determination of the stellar metallicity in the close pair galaxy NGC 4038 (D = 20 Mpc) based on the quantitative analysis of moderate-resolution KMOS/Very Large Telescope spectra of three super star clusters. The method adopted in our analysis has been developed and optimized to measure accurate metallicities from atomic lines in the J-band of single red supergiant (RSG) or RSG-dominated star clusters. Hence, our metallicity measurements are not affected by the biases and poorly understood systematics inherent to strong line H ii methods, which are routinely applied to massive data sets of galaxies. We find [Z] = +0.07 ± 0.03 and compare our measurements to H ii strong line calibrations. Our abundances and literature data suggest the presence of a flat metallicity gradient, which can be explained as redistribution of metal-rich gas following the strong interaction.
Free Keywords:galaxies: abundances; galaxies: individual: NGC 4038&39; galaxies: star clusters: general; methods: analytical; techniques: spectroscopic
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.1088/0004-637X/812/2/160
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