submm-faint, star forming radio galaxies
(3''x3'' HST/ACS images of our z~2 SFRGs with contours showing 0.3'' MERLIN radio in overlay)
NAM Press Release   1 April 2008
Coverage by USAtoday.com
Coverage by redorbit.com
Coverage by space.com
Cambridge Press Release   3 April 2008
New molecular gas and high resolution
radio observations confirm a population of distant star forming galaxies similar to the
ultraluminous ``submm galaxies'' (SMGs), but having slightly hotter
The resulting lower submm fluxes mean these galaxies have gone largely unrecognized previously.
The volume density of this new `hot' population is uncertain, yet could contribute to the star formation rate density at z~2
just as significantly as SMGs.
Confirming a Population of Hot-dust Dominated, Star Forming Ultraluminous Galaxies at High-Redshift
Casey et al. 2009b (astro-ph/0906.5346) MNRAS in press
Constraining star formation and AGN in z~2 massive galaxies using high-resolution MERLIN radio observations
Casey et al. 2009a (astro-ph/0902.1528) MNRAS 395, 1249
Interferometric CO Observations of submillimeter-faint, radio-selected starburst galaxies at z~2
Chapman et al. 2008 (astro-ph/0807.3674) ApJ 689, 889
The double radio components shown above (coupled with the HST/ACS 'disturbed' galaxy imagery) represent
dramatic merging events in the early universe. Here we see them in submm-faint, star forming radio galaxies
(SFRGs) whose classifications were unclear until high resolution radio distinguished these disturbed systems
from AGN and otherwise relaxed star forming systems. Our observations suggest that such collisions probably triggered
extreme black hole and galaxy growth in the early Universe, setting the stage for the birth of quasars.
Where do they fit in with SMGs, and AGN radio sources?
This is what we think.
are found here. they include:
CONTACT DETAILS OF SOME TEAM MEMBERS:
Scott Chapman & Caitlin Casey of Cambridge University
Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA, UK
tel (44) 1223 313290 or (44) 1223 766653
Tom Muxlow & Rob Beswick of Jodrell Bank Observatory
University of Manchester, Macclesfield, SK11 9DL, UK
Ian Smail of the University of Durham
Institute for Computational Cosmology, South Road, Durham DH1 3LE, UK
Rob Ivison of the University of Edinburgh
Institute for Astronomy, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
Andrew Blain of Caltech
California Institute of Technology, Pasadena, CA, 91125, USA
Frank Bertoldi of the University of Bonn, Germany
Last revised: 1st of April, 2009