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Ammonia downstream from HH 80 NorthHH 80-81 are two optically visible Herbig-Haro (HH) objects located about 5 minutes south of their exciting source IRAS 18162-2048. Displaced symmetrically to the north of this luminous IRAS source, a possible HH counterpart was recently detected as a radio continuum source with the very large array (VLA). This radio source, HH 80 North, has been proposed to be a member of the Herbig-Haro class since its centimeter flux density, angular size, spectral index, and morphology are all similar to those of HH 80. However, no object has been detected at optical wavelengths at the position of HH 80 North, possibly because of high extinction, and the confirmation of the radio continuum source as an HH object has not been possible. In the prototypical Herbig-Haro objects HH 1 and 2, ammonia emission has been detected downstream of the flow in both objects. This detection has been intepreted as a result of an enhancement in the ammonia emission produced by the radiation field of the shock associated with the HH object. In this Letter we report the detection of the (1,1) and (2,2) inversion transitions of ammonia downstream HH 80 North. This detection gives strong suppport to the interpretation of HH 80 North as a heavily obscured HH object. In addition, we suggest that ammonia emission may be a tracer of embedded Herbig-Haro objects in other regions of star formation. A 60 micrometer IRAS source could be associated with HH 80 North and with the ammonia condensation. A tentative explanation for the far-infrared emission as arising in dust heated by their optical and UV radiation of the HH object is presented.
Document ID
19950045447
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Girart, Jose M.
(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA United States)
Rodriguez, Luis F.
(UNAM Mexico, Mexico)
Anglada, Guillem
(Univ. de Barcelona Barcelona, Spain)
Estalella, Robert
(Univ. de Barcelona Barcelona, Spain)
Torrelles, Jose, M.
(CSIC Granada, Spain)
Marti, Josep
(Univ de Barcelona Barcelona, Spain)
Pena, Miriam
(UNAM Mexico, Mexico)
Ayala, Sandra
(UNAM Mexico, Mexico)
Curiel, Salvador
(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA United States)
Noriega-Crespo, Alberto
(Caltech-JPL, Pasadena, CA United States)
Date Acquired
August 16, 2013
Publication Date
November 10, 1994
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 435
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
95A77046
Distribution Limits
Public
Copyright
Other

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