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Metallicity gradients in intermediate-redshift absorption-selected galaxies

Published online by Cambridge University Press:  03 March 2020

Lise Christensen ,
Henrik Rhodin  and
Palle Møller
Lise Christensen
Affiliation:
Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen O, Denmark email: [email protected]
Henrik Rhodin
Affiliation:
Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen O, Denmark email: [email protected]
Palle Møller
Affiliation:
European Southern Observatory, Karl-Schwarzschildstrasse 2, D-85748 Garching bei München, Germany
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Abstract

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. Metallicity gradients are most frequently investigated directly from galaxies observed in emission. We have shown that galaxies detected via strong quasar absorption lines also exhibits a metallicity gradient in the outskirts and circumgalactic medium out to ~40 kpc distance. We infer a metallicity gradient of −0.022 dex kpc−1 for absorption-selected systems at redshifts 0.1 z 3. Applying this metallicity gradient and a flattening of the gradient beyond 12 kpc, we demonstrate that absorption-selected galaxies obey the same mass-metallicity relation (MZR) as observed for luminosity-selected galaxies.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium A30: Astronomy in Focus XXX , August 2018 , pp. 273
Copyright
© International Astronomical Union 2020

References

Christensen, L., Møller, P., Fynbo, J. P. U., & Zafar, T. 2014, MNRAS, 445, 225 CrossRefGoogle Scholar
Fynbo, J. P. U., Laursen, P., Ledoux, C., et al. 2010, MNRAS, 408, 2128 Google Scholar
Møller, P., Fynbo, J. P. U., Ledoux, C., & Nilsson, K. K. 2013, MNRAS, 430, 2680 Google Scholar
Rhodin, N. H. P., Christensen, L., Møller, P., Zafar, T., & Fynbo, J. P. U. 2018, arXiv:1807.01755Google Scholar