The Highly Collimated Radio Jet of HH 80–81: Structure and Nonthermal Emission
| Autor: | Adriana Rodríguez-Kamenetzky, Manel Perucho, Carlos Valotto, Carlos Carrasco-González, Gustavo E. Romero, Guillem Anglada, Anabella T. Araudo, Luis F. Rodríguez, José M. Torrelles, Josep Martí |
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| Rok vydání: | 2017 |
| Předmět: |
JETS AND OUTFLOWS [ISM]
Astrophysics::High Energy Astrophysical Phenomena Ciencias Físicas FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences Collimated light ACCELERATION OF PARTICLES purl.org/becyt/ford/1 [https] FORMATION [STARS] 0103 physical sciences 010306 general physics 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics High Energy Astrophysical Phenomena (astro-ph.HE) Physics Jet (fluid) Astronomy and Astrophysics purl.org/becyt/ford/1.3 [https] Astrophysics - Astrophysics of Galaxies Astronomía Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics - High Energy Astrophysical Phenomena CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| ISSN: | 1538-4357 |
| Popis: | Radio emission from protostellar jets is usually dominated by free-free emission from thermal electrons. However, in some cases, it has been proposed that non-thermal emission could also be present. This additional contribution from non-thermal emission has been inferred through negative spectral indices at centimeter wavelengths in some regions of the radio jets. In the case of HH 80-81, one of the most powerful protostellar jets known, linearly polarized emission has also been detected, revealing that the non-thermal emission is of synchrotron nature from a population of relativistic particles in the jet. This result implies that an acceleration mechanism should be taking place in some parts of the jet. Here, we present new high sensitivity and high angular resolution radio observations at several wavelengths (in the 3-20 cm range) of the HH80-81 radio jet. These new observations represent an improvement in sensitivity and angular resolution by a factor of $\sim$10 with respect to previous observations. This allows us to resolve the morphology of the radio jet, and to study the different emission mechanisms involved through spectral index maps. We conclude that synchrotron emission in this jet arises from an extended component detected at low frequencies and from the termination points of the jet, where strong shocks against the ambient medium can produce efficient particle acceleration. 28 pages, 7 figures, and 3 tables. Accepted for publication in ApJ |
| Databáze: | OpenAIRE |
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