INWARD MOTIONS IN STARLESS CORES TRACED WITH CS (3-2) and (2-1) LINES
作者： CHANG WON LEE , PHILIP C. MYERS , RENE PLUME
DOI: 10.5303/JKAS.2004.37.4.257
关键词: Astronomy 、 Spectral line 、 Physics 、 Atmospheric radiative transfer codes 、 Line (formation) 、 Optical depth 、 Astrophysics
摘要: We compare the results of surveys starless cores performed with CS (2-1) and (3-2) lines to study inward motions in cores. The velocity shifts CS(3-2) respect are found correlate well each other have similar number distributions, implying that, many cores, systematic gaseous material may occur over a range density at least factor 4. Fits spectra 2-layer radiative transfer model ten infall candidates suggest that median effective line-of-sight speed inward-moving gas is for CS(2-1). Considering optical depth obtained from fits usually smaller than line, this indicate traces inner, denser greater CS(2-1) faster toward center. However, conclusion not be representative all core candidates, due statistically small analyzed here. Further line observations will useful test conclusion.
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