The mass-metallicity relation of Lyman-break analogues and its dependence on galaxy properties

Jianhui Lian, Jinrong Li, Wei Yan, Xu Kong

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Abstract

We investigate the mass–metallicity relation and its dependence on galaxy physical properties with a sample of 703 Lyman-break analogues (LBAs) in local Universe, which have similar properties to high-redshift star-forming galaxies. The sample is selected according to Hα luminosity, L(Hα) > 1041.8 erg s−1, and surface brightness, I(Hα) > 1040.5 erg s−1 kpc−2, criteria. The mass–metallicity relation of LBAs harmoniously agrees with that of star-forming galaxies at z ∼ 1.4–1.7 in stellar mass range of 108.5 M⊙ < M★ < 1011 M⊙. The relation between stellar mass, metallicity and star formation rate of our sample is roughly consistent with the local fundamental metallicity relation. We find that the mass–metallicity relation shows a strong correlation with the 4000 Å break; galaxies with higher 4000 Å break typically have higher metallicity at a fixed mass, by 0.06 dex in average. This trend is independent of the methodology of metallicity. We also use the metallicity estimated by Te-method to confirm it. The scatter in mass–metallicity relation can be reduced from 0.091 to 0.077 dex by a three-dimensional relation between stellar mass, metallicity and 4000 Å break. The reduction of scatter in mass–metallicity relation suggests that the galaxy stellar age plays an important role as the second parameter in the mass–metallicity relation of LBAs.
Original languageEnglish
Pages (from-to)1449–1457
JournalMonthly Notices of the Royal Astronomical Society
Volume446
Issue number2
Early online date19 Nov 2014
DOIs
Publication statusPublished - 11 Jan 2015
Externally publishedYes

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