Bottinelli, Sandrine and Hughes, A. Meredith and van Dishoeck, Ewine F. and Young, Ken H. and Chamberlin, Richard and Tilanus, Remo P. J. and Gurwell, Mark A. and Wilner, David J. and van Langevelde, Huib Jan and Hogerheijde, Michiel R. and Christensen, Robert D. and Shinnaga, Hiroki and Yoshida, Hiroshige (2009) Detection of C I in Absorption toward PKS 1830 – 211 with the eSMA. Astrophysical Journal Letters, 690 (2). L130-L134. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:BOTapjl09
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We report the first science observations and results obtained with the "extended" SMA (eSMA), which is composed of the SMA (Submillimeter Array), JCMT (James Clerk Maxwell Telescope), and CSO (Caltech Submillimeter Observatory). Redshifted absorptions at z = 0.886 of C I (3P1-3P0) were observed with the eSMA with an angular resolution of 0".55 × 0".22 at 1.1 mm toward the southwestern image of the remarkable lensed quasar PKS 1830–211, but not toward the northeastern component at a separation of ~1". Additionally, SMA observations of CO, 13CO, and C18O (all J = 4-3) were obtained toward this object: CO was also detected toward the southwest component, but none of the isotopologues were. This is the first time [C I] has been detected in this object, allowing the first direct determination of relative abundances of neutral atomic carbon to CO in the molecular clouds of a spiral galaxy at z > 0.1. The [C I] and CO profiles can be decomposed into two and three velocity components, respectively. We derive C/CO column density ratios ranging from ≾ 0.5 (representative of dense cores) to ~2.5 (close to translucent cloud values). This could indicate that we are seeing environments with different physical conditions or that we are witnessing the chemical evolution of regions where C has not completely been converted into CO.
|Additional Information:||© 2009. The American Astronomical Society. Received 2008 August 19; accepted 2008 November 23; published 2008 December 22. Print publication: Issue 2 (2009 January 10). We are very much indebted to Ray Blundell, Gary Davis, and Tom Phillips, the directors of the SMA, JCMT, and CSO, respectively, for their continued support and without whom the eSMA would not be possible. The development of the eSMA has been facilitated by grant 614.061.416 from the Netherlands Organisation for Scientific Research, NWO. A.M.H. is supported by a National Science Foundation Graduate Research Fellowship.|
|Subject Keywords:||galaxies: ISM; ISM: abundances; quasars: absorption lines; quasars: individual (PKS 1830)|
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|Deposited By:||Archive Administrator|
|Deposited On:||30 Dec 2008 01:50|
|Last Modified:||26 Dec 2012 10:40|
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