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Lardo, C, Davies, B, Kudritzki, R-P, Gazak, JZ, Evans, CJ, Patrick, LR, Bergemann, M and Plez, B (2015) Red supergiants as cosmic abundance probes: The first direct metallicity determination of NGC 4038 in the antennae. Astophysical Journal, 812 (2). ISSN 0004-637X
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Abstract
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/VLT spectra of three super star clusters (SSCs). The method adopted in our analysis has been developed and optimised 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 a_ected 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 _nd [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 at metallicity gradient, which can be explained as redistribution of metal-rich gas following the strong interaction.
| Item Type: | Article |
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| Uncontrolled Keywords: | 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural) |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | IOP Publishing LTD |
| Related URLs: | |
| Date Deposited: | 01 Nov 2016 12:35 |
| Last Modified: | 04 Sep 2021 12:20 |
| DOI or ID number: | 10.1088/0004-637X/812/2/160 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/4717 |
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