Detection of radio continuum emission from Herbig-Haro objects 1 and 2 and from their central exciting source

Details Detection of radio continuum emission from Herbig-Haro objects 1 and 2 and from their central exciting source Detection of radio continuum emission from Herbig-Haro objects 1 and 2 and from their central exciting source

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...293l..35p&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 293, June 1, 1985, p. L35-L38. NASA-NSF-supported r

Astronomy and Astrophysics

Astronomy

152

Herbig-Haro Objects, Nebulae, Radio Sources (Astronomy), Water Masers, Bremsstrahlung, Continuous Radiation, Orion Constellation

Scientific paper

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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