NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Very long baseline interferometric observations of the hydroxyl masers in VY Canis MajorisResults are presented for spectral-line VLBI observations of the OH emission from VY CMa. The main-line (1665 and 1667 MHz) emission was mapped with an angular resolution of 0.02 arcsec by analyzing interferometer phase data. The main-line emission comes from many maser components of apparent size less than 0.03 arcsec which are separated by up to 0.5 arcsec. New maser features near the center of the OH spectra were detected and found to lie within the region encompassed by the low-velocity OH emission. The 1612-MHz emission was mapped by Fourier inversion of the VLBI data from two baselines. All spatially isolated maser components appeared smaller than 0.15 arcsec; however, the maser emission is very complex at most velocities. Maser components within a velocity range of 1.3 km/s are often separated by more than 1 arcsec, while components more than 10 km/s apart in each emission complex are often coincident to 0.2 arcsec.
Document ID
19780042064
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Reid, M. J. (Owens Valley Radio Observatory Pasadena, Calif., United States)
Muhleman, D. O. (California Institute of Technology Pasadena, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
February 15, 1978
Publication Information
Publication: Astrophysical Journal
Subject Category
ASTRONOMY
Funding Number(s)
CONTRACT_GRANT: NSF MPS-73-04677-A02
CONTRACT_GRANT: NGR-05-002-114
Distribution Limits
Public
Copyright
Other