A CO(3-2) Survey of Warm Molecular Gas in Nearby Galaxies Rui-Qing Mao ( 毛毛毛 ) (Purple Mountain Observatory, Nanjing) C. Henkel (MPIfR) R. Mauersberger (IRAM) Dinh-Van-Trung (ASIAA) “Universe Probed by Radio” Sino-German Workshop on Radioastronomy, Kashi/Urumqi, Sept. 7- 13, 2005
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A CO(3-2) Survey of Warm Molecular Gas in Nearby Galaxies
“Universe Probed by Radio” Sino-German Workshop on Radioastronomy, Kashi/Urumqi, Sept. 7-13, 2005. A CO(3-2) Survey of Warm Molecular Gas in Nearby Galaxies. Rui-Qing Mao ( 毛瑞青 ) (Purple Mountain Observatory, Nanjing) C. Henkel (MPIfR) R. Mauersberger (IRAM) Dinh-Van-Trung (ASIAA). - PowerPoint PPT Presentation
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A CO(3-2) Survey of Warm Molecular Gas in Nearby
Galaxies
Rui-Qing Mao (毛瑞青 )(Purple Mountain Observatory, Nanjing)
C. Henkel (MPIfR) R. Mauersberger (IRAM) Dinh-Van-Trung (ASIAA)
“Universe Probed by Radio” Sino-German Workshop on Radioastronomy, Kashi/Urumqi, Sept. 7-13, 2005
Introduction:CO as a tracer of H2 in galaxies
Lower lying CO rotational line transitions are often used as tracers of H2.
CO(1-0), (2-1) surveys in galaxies Young et al. (1995) 300 galaxies @ FCRAO Braine & Combes (1992) 81 spirals @ IRAM-30m …
CO is a good tracer of density waves, spirals, bars, rings.
High spatial resolution CO(1-0) surveys in galaxies BIMA-SONG (Regan et al. 2001; Helfer et al. 2003) NUGA (S. García-Burillo F. Combes et al ) NMA (Sakamoto et al. 1999)
Introduction: Is CO a Good Tracer of SF in galaxies?
LHCN ~ LIR tight linear correlation Star formation driven LIR
CO(1-0): poor tracer?
Gao & Solomon (2004 ApJL)
Introduction:How about sub-mm CO lines?
Better tracers for the warmer/denser molecular gas
R31 = ICO(3-2)/ICO(1-0) is more sensitive to the excitation of molecular gas than R21 = ICO(2-1)/ICO(1-0)
R31 is expected to be peaked in regions of active SF High J CO lines will put more constraints to the