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| ID:
730144.0,
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 | | Volume: | 812 | | 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
URL:http://cdsads.u-strasbg.fr/abs/2015ApJ...812..160L
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