Blind detections of CO J = 10 in 11 H-ATLAS galaxies at z = 2.13.5 with the GBT/Zpectrometer
- Autor(en)
- A. I. Harris, Andrew J. Baker, David T. Frayer, Ian R. Smail, A. Mark Swinbank, Dominik A. Riechers, Paul, van der Werf, Robbie Auld, Maarten Baes, Robert Shane Bussmann, Sara Buttiglione, Antonio Cava, David L. Clements, Asantha R. Cooray, H. Dannerbauer, A Dariush, Georg Zotti, L Dunne, Simon Dye, Steve A. Eales, J. Fritz, J. González-Nuevo, Rosalind Hopwood, E. Ibar, Rob J. Ivison, M. J. Jarvis, Paul S Maddox, Mattia Negrello, Emma E. Rigby, Dan J.B. Smith, P Temi, J. L. Wardlow
- Abstrakt
We report measurements of the carbon monoxide ground state rotational transition (12C16O J = 1-0) with the Zpectrometer ultrawideband spectrometer on the 100 m diameter Green Bank Telescope. The sample comprises 11 galaxies with redshifts between z = 2.1 and 3.5 from a total sample of 24 targets identified by Herschel-ATLAS photometric colors from the SPIRE instrument. Nine of the CO measurements are new redshift determinations, substantially adding to the number of detections of galaxies with rest-frame peak submillimeter emission near 100 µm. The CO detections confirm the existence of massive gas reservoirs within these luminous dusty star-forming galaxies (DSFGs). The CO redshift distribution of the 350 µm selected galaxies is strikingly similar to the optical redshifts of 850 µm-selected submillimeter galaxies in 2.1 = z = 3.5. Spectroscopic redshifts break a temperature-redshift degeneracy; optically thin dust models fit to the far-infrared photometry indicate characteristic dust temperatures near 34 K for most of the galaxies we detect in CO. Detections of two warmer galaxies, and statistically significant nondetections, hint at warmer or molecule-poor DSFGs with redshifts that are difficult to determine from Herschel-SPIRE photometric colors alone. Many of the galaxies identified by H-ATLAS photometry are expected to be amplified by foreground gravitational lenses. Analysis of CO linewidths and luminosities provides a method for finding approximate gravitational lens magnifications µ from spectroscopic data alone, yielding µ ~ 3-20. Corrected for magnification, most galaxy luminosities are consistent with an ultraluminous infrared galaxy classification, but three are candidate hyper-LIRGs with luminosities greater than 1013 L ?.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- University of Maryland, College Park, Rutgers University, National Radio Astronomy Observatory, Green Bank, Durham University, California Institute of Technology (Caltech), Leiden University, Cardiff University, Ghent University , Harvard-Smithsonian Center for Astrophysics, INAF - Osservatorio Astronomico di Padova, Universidad Complutense De Madrid, Imperial College London, University of California, Irvine, Centre National De La Recherche Scientifique (CNRS), University of Canterbury, University of Nottingham, Universidad de Cantabria, The Royal Observatory, Edinburgh, University of Edinburgh, University of Hertfordshire, University of the Western Cape (UWC), National Aeronautics & Space Administration (NASA)
- Journal
- The Astrophysical Journal: an international review of astronomy and astronomical physics
- Band
- 752
- Anzahl der Seiten
- 14
- ISSN
- 0004-637X
- DOI
- https://doi.org/10.1088/0004-637X/752/2/152
- Publikationsdatum
- 06-2012
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103003 Astronomie
- Schlagwörter
- ASJC Scopus Sachgebiete
- Astronomy and Astrophysics, Space and Planetary Science
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/b245fabd-6480-456b-b5c1-96cce859007d