Detection of radio emission from the Becklin-Neugebauer object
1983; IOP Publishing; Volume: 271; Linguagem: Inglês
10.1086/184087
ISSN1538-4357
AutoresJ. M. Moran, Guido Garay, M. J. Reid, R. Genzel, M. C. H. Wright, R. L. Plambeck,
Tópico(s)Superconducting Materials and Applications
Resumoview Abstract Citations (48) References (15) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Detection of radio emission from the Becklin-Neugebauer object. Moran, J. M. ; Garay, G. ; Reid, M. J. ; Genzel, R. ; Wright, M. C. H. ; Plambeck, R. L. Abstract Observations of the Becklin-Neugebauer object (BN) in the Orion-KL region made with the VLA (at 4.9, 15.0, and 22.8 GHz) and with the Hat Creek Millimeter Interferometer (HCMI) (at 87.6 GHz) during 1981 and 1982 are reported. No emission was detected with HCMI, implying a flux-density limit of 70 mJy. Emissions detected at 15 and 23 GHz correspond to a size less than 0.07 arcsec and a brightness temperature greater than 11,000 K; a VLA map of the region at 15 GHz is shown. The emission is considered optically thick (spectral index about 2) at 15-23 GHz, but thin above about 40 GHz. Two models which could explain the BN emissions are discussed: a compact H II region of uniform electron density (about 10 to the 7th/cu cm), or an ionized stellar wind (volume emission measure = about 10 to the 60th/cu cm) with a finite recombination radius. For either model the H mass is calculated as approximately 10 to the -6th solar mass, with a radius of about 3 x 10 to the 14th cm. A second radio source (3 mJy at 15 GHz) not coincident with an IR source was detected in the region, while no radio emission was detected from IRc2. Publication: The Astrophysical Journal Pub Date: August 1983 DOI: 10.1086/184087 Bibcode: 1983ApJ...271L..31M Keywords: Astronomical Spectroscopy; Emission Spectra; Infrared Spectra; Orion Nebula; Radio Spectra; Brightness Temperature; H Ii Regions; Optical Thickness; Radiant Flux Density; Stellar Evolution; Stellar Mass Ejection; Stellar Winds; Astrophysics full text sources ADS | data products SIMBAD (1)
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