A.P. Thomson
VLA imaging of 12CO J = 1-0 and free-free emission in lensed submillimetre galaxies
Thomson, A.P.; Ivison, R.J.; Smail, I.; Swinbank, A.M.; Weiss, A.; Kneib, J.-P.; Papadopoulos, P.P.; Baker, A.J.; Sharon, C.E.; van Moorsel, G.A.
Authors
R.J. Ivison
Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
A.M. Swinbank
A. Weiss
J.-P. Kneib
P.P. Papadopoulos
A.J. Baker
C.E. Sharon
G.A. van Moorsel
Abstract
We present a study using the Karl G. Jansky Very Large Array (VLA) of 12CO J = 1-0 emission in three strongly lensed submillimetre-selected galaxies (SMM J16359, SMM J14009 and SMM J02399) at z = 2.5-2.9. These galaxies span LIR = 1011-1013 L⊙, offering an opportunity to compare the interstellar medium of luminous infrared galaxies and ultraluminous infrared galaxies at high redshift. We estimate molecular gas masses in the range of 2-40 × 109 M⊙ using a method that assumes canonical underlying brightness temperature (Tb) ratios for star-forming and non-star-forming gas phases and a maximal star formation efficiency. A more simplistic method - using XCO = 0.8 and the measured Tb ratios - yields gas masses twice as high. In SMM J14009 we find L CO 3-2'/L CO 1-0'=0.95±0.12, indicative of warm, star-forming gas, possibly influenced by the central active galactic nucleus (AGN). We set a gas mass limit of 3σ < 6 × 108 M⊙ for the Lyman break galaxy, A2218 #384, located in the same field as SMM J16359 at z = 2.515. Finally, we use the rest-frame ˜115 GHz free-free flux densities for SMM J14009 and SMM J02399 - measurements tied directly to the photoionization rate of massive stars, and made possible by VLA's bandwidth - to estimate star formation rates (SFRs) of 400-600 M⊙ yr-1 and to estimate the fraction of LIR due to AGN.
Citation
Thomson, A., Ivison, R., Smail, I., Swinbank, A., Weiss, A., Kneib, J., …van Moorsel, G. (2012). VLA imaging of 12CO J = 1-0 and free-free emission in lensed submillimetre galaxies. Monthly Notices of the Royal Astronomical Society, 425(3), 2203-2211. https://doi.org/10.1111/j.1365-2966.2012.21584.x
Journal Article Type | Article |
---|---|
Publication Date | Sep 1, 2012 |
Deposit Date | May 10, 2013 |
Publicly Available Date | Jul 2, 2013 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 425 |
Issue | 3 |
Pages | 2203-2211 |
DOI | https://doi.org/10.1111/j.1365-2966.2012.21584.x |
Keywords | ISM, Molecules, Galaxies, Active, High-redshift, Starburst. |
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The definitive version is available at www.blackwell-synergy.com
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