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• W3101661977 abstract "We present results of the 12CO (1–0) mosaic observations of the nearby barred-spiral galaxy M 83 obtained with the Atacama Large Millimeter/submillimeter Array (ALMA). The total flux is recovered by combining the ALMA data with single-dish data obtained using the Nobeyama 45 m telescope. The combined map covers a ∼13 kpc2 field that includes the galactic center, eastern bar, and spiral arm with a resolution of 2|${^{primeprime}_{.}}$|03 × 1|${^{primeprime}_{.}}$|15 (∼45 pc × ∼25 pc). With a resolution comparable to typical sizes of giant molecular clouds (GMCs), the CO distribution in the bar and arm is resolved into many clumpy peaks that form ridge-like structures. Remarkably, in the eastern arm, the CO peaks form two arc-shaped ridges that run along the arm and exhibit a distinct difference in the activity of star formation: the one on the leading side has numerous H ii regions associated with it, whereas the other one on the trailing side has only a few. To see whether GMCs form stars with uniform star formation efficiency (SFE) per free-fall time (SFEff), GMCs are identified from the data cube and then cross-matched with the catalog of |${H},, small {II}$| regions to estimate the star formation rate for each of them. 179 GMCs with a median mass of 1.6 × 106 M⊙ are identified. The mass-weighted average SFEff of the GMCs is ∼9.4 × 10−3, which is in agreement with models of turbulence regulated star formation. Meanwhile, we find that SFEff is not universal within the mapped region. In particular, one of the arm ridges shows a high SFEff with a mass-weighted value of ∼2.7 × 10−2, which is higher by more than a factor of 5 compared to the inter-arm regions. This large regional variation in SFEff favors the recent interpretation that GMCs do not form stars at a constant rate within their lifetime." @default.
• W3101661977 created "2020-11-23" @default.
• W3101661977 creator A5003889965 @default.
• W3101661977 creator A5008468186 @default.
• W3101661977 creator A5011548855 @default.
• W3101661977 creator A5033638128 @default.
• W3101661977 creator A5064215574 @default.
• W3101661977 creator A5082368062 @default.
• W3101661977 creator A5084928782 @default.
• W3101661977 creator A5088483202 @default.
• W3101661977 creator A5088958527 @default.
• W3101661977 date "2018-06-27" @default.
• W3101661977 modified "2023-10-01" @default.
• W3101661977 title "ALMA 12CO (J = 1–0) imaging of the nearby galaxy M 83: Variations in the efficiency of star formation in giant molecular clouds" @default.
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