Giant Molecular Outflows Powered by Protostars in L1448
| Autor: | JoAnn O'Linger, G. Wolf-Chase, Mary Barsony |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
010504 meteorology & atmospheric sciences
Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Kinetic energy 01 natural sciences Spectral line law.invention Telescope law 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Protostar 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Line (formation) Physics Solar mass Astrophysics (astro-ph) Astronomy and Astrophysics 13. Climate action Space and Planetary Science Magnitude (astronomy) Outflow |
| Zdroj: | The Astronomical Journal. 120:1467-1478 |
| ISSN: | 0004-6256 |
| DOI: | 10.1086/301535 |
| Popis: | We present sensitive, large-scale maps of the CO J=1-0 emission of the L1448 dark cloud. These maps were acquired using the On-The-Fly capability of the NRAO 12-meter telescope. CO outflow activity is seen in L1448 on parsec-scales for the first time. Careful comparison of the spatial and velocity distribution of our high-velocity CO maps with previously published optical and near-infrared images and spectra has led to the identification of six distinct CO outflows. We show the direct link between the heretofore unknown, giant, highly-collimated, protostellar molecular outflows and their previously discovered, distant optical manifestations. The outflows traced by our CO mapping generally reach the projected cloud boundaries. Integrated intensity maps over narrow velocity intervals indicate there is significant overlap of blue- and red-shifted gas, suggesting the outflows are highly inclined with respect to the line-of-sight, although the individual outflow position angles are significantly different. The velocity channel maps also show that the outflows dominate the CO line cores as well as the high-velocity wings. The magnitude of the combined flow momenta, as well as the combined kinetic energy of the flows, are sufficient to disperse the 50 solar mass NH3 cores in which the protostars are currently forming, although some question remains as to the exact processes involved in redirecting the directionality of the outflow momenta to effect the complete dispersal of the parent cloud. Comment: 11 pages, 9 figures, to be published in the Astronomical Journal |
| Databáze: | OpenAIRE |
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