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Red supergiants as cosmic abundance probes: The first direct metallicity determination of NGC 4038 in the antennae.

Lardo, C and Davies, B and Kudritzki, R-P and Gazak, JZ and Evans, CJ and Patrick, LR and 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
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: 07 Sep 2017 13:22
DOI or Identification number: 10.1088/0004-637X/812/2/160
URI: http://researchonline.ljmu.ac.uk/id/eprint/4717

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