A Caltech Library Service

The WiggleZ Dark Energy Survey: high-resolution kinematics of luminous star-forming galaxies

Wisnioski, Emily and Wyder, Ted and Martin, Chris and Forster, Karl (2011) The WiggleZ Dark Energy Survey: high-resolution kinematics of luminous star-forming galaxies. Monthly Notices of the Royal Astronomical Society, 417 (4). pp. 2601-2623. ISSN 0035-8711.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


We report evidence of ordered orbital motion in luminous star-forming galaxies at z~ 1.3. We present integral field spectroscopy (IFS) observations, performed with the OH Suppressing InfraRed Imaging Spectrograph (OSIRIS) system, assisted by laser guide star adaptive optics on the Keck telescope, of 13 star-forming galaxies selected from the WiggleZ Dark Energy Survey. Selected via ultraviolet and [O ii] emission, the large volume of the WiggleZ survey allows the selection of sources which have comparable intrinsic luminosity and stellar mass to IFS samples at z > 2. Multiple 1–2 kpc size subcomponents of emission, or ‘clumps’, are detected within the Hα spatial emission which extends over 6–10 kpc in four galaxies, resolved compact emission (r < 3 kpc) is detected in five galaxies and extended regions of Hα emission are observed in the remaining four galaxies. We discuss these data in the context of different snapshots in a merger sequence and/or the evolutionary stages of coalescence of star-forming regions in an unstable disc. We find evidence of ordered orbital motion in galaxies as expected from disc models and the highest values of velocity dispersion (σ > 100 km s^(−1)) in the most compact sources. This unique data set reveals that the most luminous star-forming galaxies at z > 1 are gaseous unstable discs indicating that a different mode of star formation could be feeding gas to galaxies at z > 1, and lending support to theories of cold dense gas flows from the intergalactic medium.

Item Type:Article
Related URLs:
URLURL TypeDescription
Martin, Chris0000-0002-8650-1644
Forster, Karl0000-0001-5800-5531
Additional Information:© 2011 The Authors. Monthly Notices of the Royal Astronomical Society © 2011 RAS. Accepted 2011 July 11. Received 2011 July 11; in original form 2011 April 30. Article first published online: 19 Sep. 2011. We wish to thank M. Colless for three nights of Directors time on IRIS2. We would also like to thank Jim Lyke and Shelley Wright for their help recreating rectification matrices and Andy Green for helpful discussions on data reduction and kinematics. We thank the referee for very valuable comments. We wish to acknowledge financial support from The Australian Research Council (grants DP0772084 and LX0881951 directly for the WiggleZ project, and grant LE0668442 for programming support), Swinburne University of Technology, The University of Queensland and the Anglo-Australian Observatory. The WiggleZ survey would not be possible without the dedicated work of the staff of the Australian Astronomical Observatory in the development and support of the AAOmega spectrograph, and the running of the AAT. GALEX is a NASA Small Explorer, launched in 2003 April. We gratefully acknowledge NASA’s support for construction, operation and science analysis for the GALEX mission, developed in cooperation with the Centre National d’Etudes Spatiales of France and the Korean Ministry of Science and Technology. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Australian Research CouncilDP0772084
Australian Research CouncilLX0881951
Australian Research CouncilLE0668442
W. M. Keck FoundationUNSPECIFIED
Swinburne University of TechnologyUNSPECIFIED
University of QueenslandUNSPECIFIED
Anglo-Australian ObservatoryUNSPECIFIED
Subject Keywords: galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: kinematics and dynamics
Issue or Number:4
Record Number:CaltechAUTHORS:20120104-154708326
Persistent URL:
Official Citation:Wisnioski, E., Glazebrook, K., Blake, C., Wyder, T., Martin, C., Poole, G. B., Sharp, R., Couch, W., Kacprzak, G. G., Brough, S., Colless, M., Contreras, C., Croom, S., Croton, D., Davis, T., Drinkwater, M. J., Forster, K., Gilbank, D. G., Gladders, M., Jelliffe, B., Jurek, R. J., Li, I.-h., Madore, B., Pimbblet, K., Pracy, M., Woods, D. and Yee, H. K. C. (2011), The WiggleZ Dark Energy Survey: high-resolution kinematics of luminous star-forming galaxies. Monthly Notices of the Royal Astronomical Society, 417: 2601–2623. doi: 10.1111/j.1365-2966.2011.19429.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28658
Deposited By: Ruth Sustaita
Deposited On:05 Jan 2012 15:29
Last Modified:09 Mar 2020 22:58

Repository Staff Only: item control page