Molecular Cloud Associated with AFGL 2591

Details Molecular Cloud Associated with AFGL 2591 Molecular Cloud Associated with AFGL 2591

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jkas...41..139m&link_type=abstract

Journal of the Korean Astronomical Society, vol. 41, no. 5, pp. 139-145

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2

Ism: Abundances, Ism: Individual, Afgl 2591, Stars: Formation

Scientific paper

The molecular cloud, embedding AFGL 2591, has a ``head-and-tail'' structure with a total mass of ˜ 1800 M_&sun;, about half of the mass (˜ 900 M_&sun;) in the head (size ˜ 1.2 pc in diameter), and another half in the envelope (˜ 3.5 pc in the east-west direction). We found a new cloud in the direction toward north-east from AFGL 2591 (projected distance ˜ 2.4 pc), which is probably associated with the AFGL 2591 cloud. The ^{12}CO spectrum clearly shows a blue-shifted high-velocity wing at around the velocity -20 ˜ -10 km s^{-1}, but it is not clear whether this high-velocity component has a bipolar nature in our observations. The observed CN spectra also show blue-shifted wing component but the existence of the red-shifted component is not clear, either. In some CN and HCN spectra, the high-velocity components appear as a different velocity component, not a broad line-wing component. The dense cores, traced by CN and HCN, exist in the `head' of the AFGL 2591 cloud with an elongated morphology roughly in the north-south direction with a size of about 0.5 pc. The abundance ratio between CN and HCN is found to be about 2-3 within the observed region, which may suggest a possibility that this core is being affected by the embedded YSOs or by possible shocks from outside.

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