Astrophys. J., 833, 209-209 (2016/December-3)
Dense core properties in the infrared dark cloud G14.225-0.506 revealed by ALMA.
OHASHI S., SANHUEZA P., CHEN H.-R.V., ZHANG Q., BUSQUET G., NAKAMURA F., PALAU A. and TATEMATSU K.
Abstract (from CDS):
We have performed a dense core survey toward the Infrared Dark Cloud G14.225-0.506 at 3 mm continuum emission with the Atacama Large Millimeter/Submillimeter Array (ALMA). This survey covers the two hub-filament systems with an angular resolution of ∼3′′ (∼0.03 pc). We identified 48 dense cores. 20 out of the 48 cores are protostellar due to their association with young stellar objects (YSOs) and/or X-ray point-sources, while the other 28 cores are likely prestellar and unrelated with known IR or X-ray emission. Using APEX 870 µm continuum emission, we also identified the 18 clumps hosting these cores. Through virial analysis using the ALMA N2H+ and VLA/Effelsberg NH3 molecular line data, we found a decreasing trend in the virial parameter with decreasing scales from filaments to clumps, and then to cores. The virial parameters of 0.1-1.3 in cores indicate that cores are likely undergoing dynamical collapse. The cumulative core mass function for the prestellar core candidates has a power law index of α=1.6, with masses ranging from 1.5 to 22 M☉. We find no massive prestellar or protostellar cores. Previous studies suggest that massive O-type stars have not been produced yet in this region. Therefore, high-mass stars should be formed in the prestellar cores by accreting a significant amount of gas from the surrounding medium. Another possibility is that low-mass YSOs become massive by accreting from their parent cores that are fed by filaments. These two possibilities might be consistent with the scenario of global hierarchical collapse.
© 2016. The American Astronomical Society. All rights reserved.
ISM: clouds - ISM: individual: G14.225-0.506 - stars: formation - stars: formation
Table 1: [OSC2016] N-NN (Nos N-1 to N-29), [OSC2016] S-NN (Nos S-1 to S-19). Table 2: [OSC2016] NN (Nos 1-18).
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