2006
DOI: 10.1086/504036
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Giant Molecular Clouds Are More Concentrated toward Spiral Arms than Smaller Clouds

Abstract: From our catalog of Milky Way molecular clouds, created using a temperature thresholding algorithm on the Bell Laboratories survey, we have extracted two subsets: (1) clouds that are definitely larger than 10 5 M , , 13 CO even if they are at their "near distance" (i.e., giant molecular clouds [GMCs]), and (2) clouds that are definitely smaller than 10 5 M , , even if they are at their "far distance." The positions and velocities of these clouds are compared to the loci of spiral arms in ( )-space. The radial … Show more

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Cited by 44 publications
(42 citation statements)
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“…All three samples are very tightly correlated with the spiral arms with over 80% having offsets <10 km s −1 . They are all significantly different from the distribution of lower mass clouds in the GRS sample (KolmogorovSmirnov test p-value <1.8×10 −4 for all samples), which is likely to include a number of inter-arm clouds (∼10%; Stark & Lee 2006). The difference in the distribution of the most massive clouds and the rest of the population is in excellent agreement with the findings of Stark & Lee (2006).…”
Section: Correlation Of Filaments With the Spiral Armssupporting
confidence: 69%
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“…All three samples are very tightly correlated with the spiral arms with over 80% having offsets <10 km s −1 . They are all significantly different from the distribution of lower mass clouds in the GRS sample (KolmogorovSmirnov test p-value <1.8×10 −4 for all samples), which is likely to include a number of inter-arm clouds (∼10%; Stark & Lee 2006). The difference in the distribution of the most massive clouds and the rest of the population is in excellent agreement with the findings of Stark & Lee (2006).…”
Section: Correlation Of Filaments With the Spiral Armssupporting
confidence: 69%
“…They are all significantly different from the distribution of lower mass clouds in the GRS sample (KolmogorovSmirnov test p-value <1.8×10 −4 for all samples), which is likely to include a number of inter-arm clouds (∼10%; Stark & Lee 2006). The difference in the distribution of the most massive clouds and the rest of the population is in excellent agreement with the findings of Stark & Lee (2006). This is in spite of the fact that we have used a different catalogue of molecular clouds and spiral arm loci, although the spiral arm loci derived by different models are in broad agreement.…”
Section: Correlation Of Filaments With the Spiral Armsmentioning
confidence: 65%
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“…Only a 10% of less massive clouds were found to be unrelated to spiral arms. Following the GMC definition of Stark & Lee (2006), we found that five out of 14 GMFs consistent with GMC masses are in inter-arm regions. We therefore find that most of the GMCs in the Galaxy are related to spiral arms, as it was found by (Dame et al 1986).…”
Section: Dense Gas Mass Fraction and Its Variationmentioning
confidence: 73%
“…Stark & Lee (2006) found, using a sample of 56 GMCs (defined by them as molecular clouds with M > 10 5 M ), that all GMCs were related to spiral arms. Only a 10% of less massive clouds were found to be unrelated to spiral arms.…”
Section: Dense Gas Mass Fraction and Its Variationmentioning
confidence: 98%