Angular expansion measurement with the VLA - The distance to NGC 7027

Details Angular expansion measurement with the VLA - The distance to NGC 7027 Angular expansion measurement with the VLA - The distance to NGC 7027

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...302l..27m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 302, March 1, 1986, p. L27-L30.

Astronomy and Astrophysics

Astronomy

72

Angular Distribution, Angular Velocity, Astrometry, Planetary Nebulae, Radio Sources (Astronomy), Astronomical Maps, Distance, Morphology, Signal To Noise Ratios, Velocity Measurement

Scientific paper

The author describes a new method of using the VLA for measuring small changes in the structures of bright radio sources. As a test of the method, he has measured the angular expansion of NGC 7027, with a signal-to-noise ratio of 30, in a period of only 2.8 yr. Based on a simple model for the dynamics of the nebula, a distance of 940±200 pc is derived. The ability to detect velocities as low as 20 km s-1 at a distance of 1 kpc opens up many exciting areas of research.

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