Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jkas...37..261s&link_type=abstract
Journal of the Korean Astronomical Society, vol. 37, no. 4, pp. 261-263
Astronomy and Astrophysics
Astronomy
11
Ism: Globules, Ism: Kinematics And Dynamics, Stars: Formation
Scientific paper
We present a progress report on HCN(1-0) line observations toward starless cores to probe inward motions. We have made a single pointing survey toward the central regions of 85 starless cores and performed mapping observations of 6 infall candidate starless cores. The distributions of the velocity difference between HCN(1-0) hyperfine lines and the optically thin tracer N2H+(1-0) are significantly skewed to the blue, meaning that HCN(1-0) frequently detects inward motions. Their skewness to the blue is even greater than that of CS(2-1) Lee et al., possibly implying more infall occurrence than CS(1-0). We identify 19 infall candidates by using several characteristics illustrating spectral infall asymmetry seen in HCN(1-0) hyperfine lines, CS(3-2), CS(2-1), DCO+(2-1) and N2H+ observations. The HCN(1-0) F(0-1) with the least optical depth usually shows a similar intensity distribution to that of N2H+ which closely traces the density distribution of the cores, indicating that HCN(1-0) is less chemically affected and so believed to reflect kinematics occurring in rather inner regions of the cores. Detailed radiative transfer model fits of the spectra are underway to analyze central infall kinematics in starless cores.
Lee Chang Won
Lee Michael H.
Lee Yeonbae
Myers Phil C.
Park Se Young
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