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Title:
Detection of radio continuum emission from Herbig-Haro objects 1 and 2 and from their central exciting source
Authors:
Pravdo, S. H.; Rodriguez, L. F.; Curiel, S.; Canto, J.; Torrelles, J. M.; Becker, R. H.; Sellgren, K.
Affiliation:
AA(California Institute of Technology, Jet Propulsion Laboratory, Pasadena, CA; National Radio Astronomy Observatory, Green Bank, WV), AB(Universidad Nacional Autonoma de Mexico, Mexico City, Mexico; National Radio Astronomy Observatory, Green Bank, WV), AC(Universidad Nacional Autonoma de Mexico, Mexico City, Mexico; National Radio Astronomy Observatory, Green Bank, WV), AD(Universidad Nacional Autonoma de Mexico, Mexico City, Mexico; National Radio Astronomy Observatory, Green Bank, WV), AE(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA; National Radio Astronomy Observatory, Green Bank, WV), AF(California, University, Davis, CA; National Radio Astronomy Observatory, Green Bank, WV), AG(Hawaii, University, Honolulu, HI; National Radio Astronomy Observatory, Green Bank, WV)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 293, June 1, 1985, p. L35-L38. NASA-NSF-supported research; Consejo Nacional de Ciencia y Tecnologia of Mexico. (ApJL Homepage)
Publication Date:
06/1985
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Herbig-Haro Objects, Nebulae, Radio Sources (Astronomy), Water Masers, Bremsstrahlung, Continuous Radiation, Orion Constellation
DOI:
10.1086/184486
Bibliographic Code:
1985ApJ...293L..35P

Abstract

The region in Orion containing HH 1 and HH 2 was observed with the VLA at 20, 6, and 2 cm on several occasions from 1981 to 1984. At lower resolution, four continuum sources were detected. Two of these sources coincide positionally with HH 1 and HH 2. At 6 cm and higher resolution, HH 1 is resolved into at least two components. The emission is probably bremsstrahlung originating in the same region where the visible line emission is produced. This is the first detection of radio continuum from classic Herbig-Haro objects. At a position closely centered between HH 1 and HH 2, an object that can be interpreted as the energy source of the system was detected. The central source spectrum is S(nu) of about nu to the alpha power, where alpha = 0.4 + or - 0.2, suggesting a stellar wind. Finally, the fourth radio continuum source coincides positionally with an H2O maser and is probably excited by an independent star. There is evidence of time variability in its radio flux. No emission was detected from the Cohen-Schwartz (1979) star at the 0.1 mJy level.

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