English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  The evolution and origin of ionized gas velocity dispersion from z ~ 2.6 to z ~ 0.6 with KMOS3D

Übler, H., Genzel, R., Wisnioski, E., Schreiber, N. M. F., Shimizu, T. T., Price, S. H., et al. (2019). The evolution and origin of ionized gas velocity dispersion from z ~ 2.6 to z ~ 0.6 with KMOS3D. The Astrophysical Journal, 880(1): 48. doi:10.3847/1538-4357/ab27cc.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0004-7529-B Version Permalink: http://hdl.handle.net/21.11116/0000-0005-0FF6-6
Genre: Journal Article

Files

show Files
hide Files
:
The Evolution and Origin of Ionized Gas Velocity Dispersion from z ~ 2.6 to z ~ 0.6 with KMOS3D.pdf (Any fulltext), 5MB
 
File Permalink:
-
Name:
The Evolution and Origin of Ionized Gas Velocity Dispersion from z ~ 2.6 to z ~ 0.6 with KMOS3D.pdf
Description:
-
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Übler, H., Author
Genzel, R., Author
Wisnioski, E., Author
Schreiber, N. M. Förster, Author
Shimizu, T. T., Author
Price, S. H., Author
Tacconi, L. J., Author
Belli, S., Author
Wilman, D. J., Author
Fossati, M., Author
Mendel, J. T., Author
Davies, R. L., Author
Beifiori, A., Author
Bender, R., Author
Brammer, G. B., Author
Burkert, A., Author
Chan, J., Author
Davies, R. I., Author
Fabricius, M., Author
Galametz, A., Author
Herrera-Camus, R., AuthorLang, P., AuthorLutz, D., AuthorMomcheva, I. G., AuthorNaab, T.1, Author              Nelson, E. J., AuthorSaglia, R. P., AuthorTadaki, K., Authorvan Dokkum, P. G., AuthorWuyts, S., Author more..
Affiliations:
1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              

Content

show
hide
Free keywords: -
 Abstract: We present the 0.6 < z < 2.6 evolution of the ionized gas velocity dispersion in 175 star-forming disk galaxies based on data from the full KMOS3D integral field spectroscopic survey. In a forward-modeling Bayesian framework including instrumental effects and beam-smearing, we fit simultaneously the observed galaxy velocity and velocity dispersion along the kinematic major axis to derive the intrinsic velocity dispersion σ0. We find a reduction of the average intrinsic velocity dispersion of disk galaxies as a function of cosmic time, from σ0 ~ 45 km s−1 at z ~ 2.3 to σ 0 ~ 30 km s−1 at z ~ 0.9. There is substantial intrinsic scatter (δσ 0int ≈ 10 km s−1) around the best-fit σ 0–z relation beyond what can be accounted for from the typical measurement uncertainties (δσ 0 ≈ 12 km s−1), independent of other identifiable galaxy parameters. This potentially suggests a dynamic mechanism such as minor mergers or variation in accretion being responsible for the scatter. Putting our data into the broader literature context, we find that ionized and atomic+molecular velocity dispersions evolve similarly with redshift, with the ionized gas dispersion being ~10–15 km s−1 higher on average. We investigate the physical driver of the on average elevated velocity dispersions at higher redshift and find that our galaxies are at most marginally Toomre-stable, suggesting that their turbulent velocities are powered by gravitational instabilities, while stellar feedback as a driver alone is insufficient. This picture is supported through comparison with a state-of-the-art analytical model of galaxy evolution.

Details

show
hide
Language(s):
 Dates: 2019-07-24
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.3847/1538-4357/ab27cc
Other: LOCALID: 3152307
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: The Astrophysical Journal
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 880 (1) Sequence Number: 48 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3