Journal Article

The spin of late-type galaxies at redshifts <i>z</i> ≤ 1.2

Bernardo Cervantes-Sodi, X. Hernandez, Ho Seong Hwang, Changbom Park and Damien Le Borgne

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 426, issue 2, pages 1606-1612
Published in print October 2012 | ISSN: 0035-8711
Published online October 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21812.x
The spin of late-type galaxies at redshifts z ≤ 1.2

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We study the evolution of the galactic spin using data of high-redshift galaxies in the fields of the Great Observatories Origins Deep Survey. Through simple dynamical considerations we estimate the spin for the disc galaxies in our sample and find that its distribution is consistent with that found for nearby galaxies. Defining a dimensionless angular momentum parameter for the disc component of the galaxies (λd), we do not find signs of evolution in the redshift range 0.4 ≤ z ≤ 1.2. We find that the mass and environmental dependences of the spin of our high-redshift galaxies are similar to those of low-z galaxies, showing a strong dependence on mass, in the sense that low-mass systems present higher λd values than high-mass galaxies, with no significant dependence on the environmental density. These results lead us to conclude that although individual disc galaxies might occasionally suffer strong evolution, they evolve in such a way that the overall spin distribution of the galactic population remains constant from z ∼ 1 to the present epoch.

Keywords: galaxies: evolution; galaxies: fundamental parameters; galaxies: general; galaxies: high-redshift; galaxies: statistics; galaxies: structure

Journal Article.  5124 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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