Search Swinburne Research Bank
Home List of Titles High star formation rates as the origin of turbulence in early and modern disk galaxies
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/92601
|Download PDF (Accepted manuscript) (Adobe Acrobat PDF, -1 bytes)|
- High star formation rates as the origin of turbulence in early and modern disk galaxies
- Green, Andrew W.; Glazebrook, Karl; McGregor, Peter J.; Abraham, Roberto G.; Poole, Gregory B.; Damjanov, Ivana; McCarthy, Patrick J.; Colless, Matthew; Sharp, Robert G.
- Observations of star formation and kinematics in early galaxies at high spatial and spectral resolution have shown that two-thirds are massive rotating disk galaxies (1-5), with the remainder being less massive non-rotating objects (2,4,6-8). The line-of-sight-averaged velocity dispersions are typically five times higher than in today’s disk galaxies. This suggests that gravitationally unstable, gas-rich disks in the early Universe are fuelled by cold, dense accreting gas flowing along cosmic filaments and penetrating hot galactic gas halos (9,10). These accreting flows, however, have not been observed (11), and cosmic accretion cannot power the observed level of turbulence (12). Here we report observations of a sample of rare, highvelocity-dispersion disk galaxies in the nearby Universe where cold accretion is unlikely to drive their high star formation rates. We find that their velocity dispersions are correlated with their star formation rates, but not their masses or gas fractions, which suggests that star formation is the energetic driver of galaxy disk turbulence at all cosmic epochs.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
- Nature, Vol. 467 (Oct 2010), pp. 684-686
- Publication year
- Galaxies; Star formation; Turbulence
- Nature Publishing Group
- Publisher URL
- Copyright © 2010 Macmillan Publishers. The accepted manuscript is reproduced in accordance with the copyright policy of the publisher.
- Additional information
- This article was awarded the Louise Webster Prize for outstanding research by a scientist early in their post-doctoral career at the 2013 Astronomical Society of Australia awards. For more information, see: http://astronomy.org.au/2013/06/
- Full text
- Peer reviewed