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The PdBI Arcsecond Whirlpool Survey (PAWS) : environmental dependence of giant molecular cloud properties in M51

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Abstract
Using data from the PdBI Arcsecond Whirlpool Survey (PAWS), we have generated the largest extragalactic giant molecular cloud (GMC) catalog to date, containing 1507 individual objects. GMCs in the inner M51 disk account for only 54% of the total (CO)-C-12(1-0) luminosity of the survey, but on average they exhibit physical properties similar to Galactic GMCs. We do not find a strong correlation between the GMC size and velocity dispersion, and a simple virial analysis suggests that similar to 30% of GMCs in M51 are unbound. We have analyzed the GMC properties within seven dynamically motivated galactic environments, finding that GMCs in the spiral arms and in the central region are brighter and have higher velocity dispersions than inter-arm clouds. Globally, the GMC mass distribution does not follow a simple power-law shape. Instead, we find that the shape of the mass distribution varies with galactic environment: the distribution is steeper in inter-arm region than in the spiral arms, and exhibits a sharp truncation at high masses for the nuclear bar region. We propose that the observed environmental variations in the GMC properties and mass distributions are a consequence of the combined action of large-scale dynamical processes and feedback from high-mass star formation. We describe some challenges of using existing GMC identification techniques for decomposing the (CO)-C-12(M51's1-0) emission in molecule-rich environments, such as M51's inner disk.
Keywords
LARGE-MAGELLANIC-CLOUD, (CO)-C-12 2-1 MAP, STAR-FORMATION, SPIRAL, STRUCTURE, INTERSTELLAR-MEDIUM, NEARBY GALAXIES, LOCAL GROUP, PHYSICAL-PROPERTIES, CARBON-MONOXIDE, LOW-METALLICITY, evolution, galaxies: individual (M51, NGC 5194), galaxies: spiral, galaxies: star formation, ISM: clouds, ISM: structure

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MLA
Colombo, Dario, et al. “The PdBI Arcsecond Whirlpool Survey (PAWS) : Environmental Dependence of Giant Molecular Cloud Properties in M51.” ASTROPHYSICAL JOURNAL, vol. 784, no. 1, 2014.
APA
Colombo, D., Hughes, A., Schinnerer, E., van der Wel, S. M., Leroy, A. K., Pety, J., … Kramer, C. (2014). The PdBI Arcsecond Whirlpool Survey (PAWS) : environmental dependence of giant molecular cloud properties in M51. ASTROPHYSICAL JOURNAL, 784(1).
Chicago author-date
Colombo, Dario, Annie Hughes, Eva Schinnerer, Sharon Meidt van der Wel, Adam K Leroy, Jerome Pety, Clare L Dobbs, et al. 2014. “The PdBI Arcsecond Whirlpool Survey (PAWS) : Environmental Dependence of Giant Molecular Cloud Properties in M51.” ASTROPHYSICAL JOURNAL 784 (1).
Chicago author-date (all authors)
Colombo, Dario, Annie Hughes, Eva Schinnerer, Sharon Meidt van der Wel, Adam K Leroy, Jerome Pety, Clare L Dobbs, Santiago Garcia-Burillo, Gaelle Dumas, Todd A Thompson, Karl F Schuster, and Carsten Kramer. 2014. “The PdBI Arcsecond Whirlpool Survey (PAWS) : Environmental Dependence of Giant Molecular Cloud Properties in M51.” ASTROPHYSICAL JOURNAL 784 (1).
Vancouver
1.
Colombo D, Hughes A, Schinnerer E, van der Wel SM, Leroy AK, Pety J, et al. The PdBI Arcsecond Whirlpool Survey (PAWS) : environmental dependence of giant molecular cloud properties in M51. ASTROPHYSICAL JOURNAL. 2014;784(1).
IEEE
[1]
D. Colombo et al., “The PdBI Arcsecond Whirlpool Survey (PAWS) : environmental dependence of giant molecular cloud properties in M51,” ASTROPHYSICAL JOURNAL, vol. 784, no. 1, 2014.
@article{8622310,
  abstract     = {Using data from the PdBI Arcsecond Whirlpool Survey (PAWS), we have generated the largest extragalactic giant molecular cloud (GMC) catalog to date, containing 1507 individual objects. GMCs in the inner M51 disk account for only 54% of the total (CO)-C-12(1-0) luminosity of the survey, but on average they exhibit physical properties similar to Galactic GMCs. We do not find a strong correlation between the GMC size and velocity dispersion, and a simple virial analysis suggests that similar to 30% of GMCs in M51 are unbound. We have analyzed the GMC properties within seven dynamically motivated galactic environments, finding that GMCs in the spiral arms and in the central region are brighter and have higher velocity dispersions than inter-arm clouds. Globally, the GMC mass distribution does not follow a simple power-law shape. Instead, we find that the shape of the mass distribution varies with galactic environment: the distribution is steeper in inter-arm region than in the spiral arms, and exhibits a sharp truncation at high masses for the nuclear bar region. We propose that the observed environmental variations in the GMC properties and mass distributions are a consequence of the combined action of large-scale dynamical processes and feedback from high-mass star formation. We describe some challenges of using existing GMC identification techniques for decomposing the (CO)-C-12(M51's1-0) emission in molecule-rich environments, such as M51's inner disk.},
  articleno    = {3},
  author       = {Colombo, Dario and Hughes, Annie and Schinnerer, Eva and van der Wel, Sharon Meidt and Leroy, Adam K and Pety, Jerome and Dobbs, Clare L and Garcia-Burillo, Santiago and Dumas, Gaelle and Thompson, Todd A and Schuster, Karl F and Kramer, Carsten},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  keywords     = {LARGE-MAGELLANIC-CLOUD,(CO)-C-12 2-1 MAP,STAR-FORMATION,SPIRAL,STRUCTURE,INTERSTELLAR-MEDIUM,NEARBY GALAXIES,LOCAL GROUP,PHYSICAL-PROPERTIES,CARBON-MONOXIDE,LOW-METALLICITY,evolution,galaxies: individual (M51,NGC 5194),galaxies: spiral,galaxies: star formation,ISM: clouds,ISM: structure},
  language     = {eng},
  number       = {1},
  pages        = {32},
  title        = {The PdBI Arcsecond Whirlpool Survey (PAWS) : environmental dependence of giant molecular cloud properties in M51},
  url          = {http://dx.doi.org/10.1088/0004-637X/784/1/3},
  volume       = {784},
  year         = {2014},
}

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