Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...396l..35c&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 396, no. 1, Sept. 1, 1992, p. L35-L38.
Astronomy and Astrophysics
Astrophysics
35
Carbon Monoxide, Emission Spectra, Globular Clusters, Pre-Main Sequence Stars, Shock Wave Propagation, Star Formation, Carbon 12, Carbon 13, Interstellar Matter, Rotational Spectra
Scientific paper
The CO J = 3-2 transition is used to map the extremely high velocity (EHV) gas in the bipolar outflow from the NGC 2071 infrared cluster. The EHV material is found only within 1.5 arcmin of the source, while the high-velocity outflow extends to over +/-3 arcmin from the source. The EHV gas is well collimated, and symmetric, with sharp velocity peaks appearing at +/-1 arcmin from the source. The EHV gas has a temperature of about 80 K, significantly hotter than that of the HV gas. In view of this temperature enhancement and spatial confinement, it is suggested that velocity peaks occur at the working surfaces of jets. Since molecules are dissociated in shocks faster than about 40 km/s, the EHV gas most likely arises from molecules reformed behind a fast shock. The presence of a working surface in the middle of the outflow suggests that the outflowing material is reaccelerated, extending the lifetime of the flow.
Chernin Lawrence M.
Masson Colin R.
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