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The JCMT Nearby Galaxies Legacy Survey I. Star Forming Molecular Gas in Virgo Cluster Spiral Galaxies | | C. D. Wilson
; B. E. Warren
; F. P. Israel
; S. Serjeant
; G. Bendo
; E. Brinks
; D. Clements
; S. Courteau
; J. Irwin
; J. H. Knapen
; J. Leech
; H. E. Matthews
; S. Muehle
; A. M. J. Mortier
; G. Petitpas
; E. Sinukoff
; K. Spekkens
; B. K. Tan
; R. P. J. Tilanus
; A. Usero
; P. van der Werf
; T. Wiegert
; M. Zhu
; | | Date: |
9 Dec 2008 | | Abstract: | We present large-area maps of the CO J=3-2 emission obtained at the James
Clerk Maxwell Telescope for four spiral galaxies in the Virgo Cluster. We
combine these data with published CO J=1-0, 24 micron, and Halpha images to
measure the CO line ratios, molecular gas masses, and instantaneous gas
depletion times. For three galaxies in our sample (NGC 4254, NGC4321, and NGC
4569), we obtain molecular gas masses of 7E8-3E9 Msun and disk-averaged
instantaneous gas depletion times of 1.1-1.7 Gyr. We argue that the CO J=3-2
line is a better tracer of the dense star forming molecular gas than the CO
J=1-0 line, as it shows a better correlation with the star formation rate
surface density both within and between galaxies. NGC 4254 appears to have a
larger star formation efficiency(smaller gas depletion time), perhaps because
it is on its first passage through the Virgo Cluster. NGC 4569 shows a
large-scale gradient in the gas properties traced by the CO J=3-2/J=1-0 line
ratio, which suggests that its interaction with the intracluster medium is
affecting the dense star-forming portion of the interstellar medium directly.
The fourth galaxy in our sample, NGC 4579, has weak CO J=3-2 emission despite
having bright 24 micron emission; however, much of the central luminosity in
this galaxy may be due to the presence of a central AGN. | | Source: | arXiv, 0812.1718 | | Services: | Forum | Review | PDF | Favorites | |
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