A Jet-driven, Extreme High-Velocity Outflow Powered by a Cold, Low-Luminosity Protostar near NGC 2023

Details A Jet-driven, Extreme High-Velocity Outflow Powered by a Cold, Low-Luminosity Protostar near NGC 2023 A Jet-driven, Extreme High-Velocity Outflow Powered by a Cold, Low-Luminosity Protostar near NGC 2023

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...519..236s&link_type=abstract

The Astrophysical Journal, Volume 519, Issue 1, pp. 236-243.

Astronomy and Astrophysics

Astronomy

16

Ism: Individual (Ngc 2023), Ism: Jets And Outflows, Ism: Molecules, Stars: Pre-Main-Sequence

Scientific paper

We have discovered an extreme high-velocity bipolar CO outflow in the vicinity of NGC 2023, with total outflow velocities of ~200 km s^-1. At very high velocities this outflow is jetlike with an opening angle <=4 deg, while it shows a separate outflow lobe at low velocities. The outflow is bipolar and exhibits a clear mirror symmetry, which suggests that the source powering the outflow is episodic or precessing. The dynamical timescales for the outflow are <=3000 yr. We identify the source driving the CO jet with a deeply embedded low-luminosity submillimeter double source (separation ~23"), where the primary component lies on the symmetry axis of the outflow and has all the signatures of a ``class 0'' protostellar object. Analysis of molecular data and (sub)millimeter photometry suggests that the driving source is cold and compact, with a luminosity of <~10 L_solar and a total mass of 1.8-4.6 M_solar. It has no near-IR counterpart, it drives an extremely young outflow, and it emits a large fraction of its luminosity in the submillimeter regime. Both millimeter sources have low dust emissivity, beta~0.8-1.3, similar to what is found for other class 0 objects, while the surrounding molecular cloud core appears to have a beta~2.0, the canonical value for ``normal'' interstellar dust in the submillimeter regime.

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