ALMA observations of a metal-rich damped Ly α absorber at z = 2.5832: evidence for strong galactic winds in a galaxy group

Fynbo, J P U ; Heintz, K E ; Neeleman, M ; Christensen, L ; Dessauges-Zavadsky, M ; Kanekar, N ; Møller, P ; Prochaska, J X ; Rhodin, N H P ; Zwaan, M (2018) ALMA observations of a metal-rich damped Ly α absorber at z = 2.5832: evidence for strong galactic winds in a galaxy group Monthly Notices of the Royal Astronomical Society, 479 (2). pp. 2126-2132. ISSN 0035-8711

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Official URL: http://doi.org/10.1093/mnras/sty1520

Related URL: http://dx.doi.org/10.1093/mnras/sty1520

Abstract

We report on the results of a search for CO(3–2) emission from the galaxy counterpart of a high-metallicity Damped Ly α Absorber (DLA) at z = 2.5832 towards the quasar Q0918+1636. We do not detect CO emission from the previously identified DLA galaxy counterpart. The limit we infer on Mgas/M is in the low end of the range found for DLA galaxies, but is still consistent with what is found for other star-forming galaxies at similar redshifts. Instead we detect CO(3–2) emission from another intensely star-forming galaxy at an impact parameter of 117 kpc from the line of sight to the quasar and 131 km s-1 redshifted relative to the velocity centroid of the DLA in the quasar spectrum. In the velocity profile of the low- and high-ionization absorption lines of the DLA there is an absorption component consistent with the redshift of this CO-emitting galaxy. It is plausible that this component is physically associated with a strong outflow in the plane of the sky from the CO-emitting galaxy. If true, this would be further evidence, in addition to what is already known from studies of Lyman-break galaxies, that galactic outflows can be traced beyond 100 kpc from star-forming galaxies. The case of this z = 2.583 structure is an illustration of this in a group environment.

Item Type:Article
Source:Copyright of this article belongs to Oxford University Press.
Keywords:Galaxies: ISM; ISM: Molecules; Quasar: Absorption Lines; Quasars: Individual (Q 0918+1636); Submillimetre: ISM.
ID Code:118058
Deposited On:12 May 2021 10:23
Last Modified:12 May 2021 10:23

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