Show simple item record

dc.contributor.authorZwaan, M.
dc.contributor.authorWalter, F.
dc.contributor.authorRyan-Weber, E.
dc.contributor.authorBrinks, E.
dc.contributor.authorde Blok, W.J.G.
dc.contributor.authorKennicutt, R.C.
dc.identifier.citationZwaan , M , Walter , F , Ryan-Weber , E , Brinks , E , de Blok , W J G & Kennicutt , R C 2008 , ' Are the kinematics of DLAs in agreement with their arising in the gas disks of galaxies? ' , The Astronomical Journal , vol. 136 , no. 6 , pp. 2886-2896 .
dc.identifier.otherdspace: 2299/2707
dc.identifier.otherORCID: /0000-0002-7758-9699/work/30407851
dc.descriptionOriginal article can be found at: Copyright American Astronomical Society DOI: 10.1088/0004-6256/136/6/2886 [Full text of this article is not available in the UHRA]
dc.description.abstractWe demonstrate in this paper that the velocity widths of the neutral gas in damped Lyα (DLA) systems are inconsistent with these systems originating in gas disks of galaxies, similar to those seen in the local universe. We examine the gas kinematics of local galaxies using the high-quality H I 21 cm data from the H I Nearby Galaxies Survey and make a comparison with the velocity profiles measured in the low-ionization metal lines observed in DLAs at high redshifts. The median velocity width of z = 0 H I gas above the DLA column density limit of N H I = 2 × 1020 cm–2 is approximately 30 km s–1, whereas the typical value in DLAs is a factor of 2 higher. We argue that the gas kinematics at higher redshifts are increasingly influenced by gas that is not participating in ordered rotation in cold disks, but is more likely associated with tidal gas related to galaxy interactions or processes such as superwinds and outflows. An analysis of the H I in the local interacting starburst galaxy M 82 shows that the velocity widths in this galaxy are indeed similar to what is seen in DLAs.en
dc.relation.ispartofThe Astronomical Journal
dc.titleAre the kinematics of DLAs in agreement with their arising in the gas disks of galaxies?en
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research (CAR)
dc.description.statusPeer reviewed
rioxxterms.typeJournal Article/Review

Files in this item


There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record