Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53..799d&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.53, No. 5, pp.799-809
Astronomy and Astrophysics
Astronomy
4
Bipolar Flows, Ism: Clouds, Ism: Individual (Iras 22134+5834, S 134), Ism: Molecules, Stars: Formation
Scientific paper
We present the results of the recent 12CO(J1-0), 13CO(J=1-0), and C12O(J1-0) observations carried out toward a bright IRAS point source (22134+5834) using the 45m telescope at Nobeyama Radio Observatory (NRO) equipped with the 4 multi-beam receiver system. The IRAS source exhibits a cold color spectrum in the far infrared wavelengths and has a high luminosity of ~= 1700 Lsolar at the adopted distance of 900pc, indicating that the IRAS source is a good candidate for an embedded young massive star whose luminosity is equivalent to that of an early B-type star having ~= 26 Msolar. A bipolar outflow and a dense core associated with IRAS 22134+5834 were detected by the present observations. It is remarkable that the outflow has a very large total molecular mass of26Msolar, which makes this source one of the most massive outflows reported to date. We derived the dynamical time scale (~= 7 × 104yr), mechanical momentum (~= 140 Msolar km s-1), and kinetic energy (~= 400 Msolar km2 s-2) of the outflow. The dense core traced in C18 is also massive (206 Msolar) extending over ~= 1pc. The core shows an elliptical shape with its major axis inclined by -45° to the north. A velocity gradient of 0.9 km s-1 pc-1 along the core major axis was observed, indicating a rotation of the core. We also detected blue and red velocity-shifted components in C18O along the core minor axis separated by ~= 0.7 km s-1 from the systemic velocity at -18.2 km s-1, which are most likely to trace the mixture of the dense gas being swept up by the powerful outflow and the matter in the core infalling toward the central star.
Dobashi Kazuhito
Uehara Hayato
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