Two-epoch VLA observations of variable galactic plane radio sources

Journal Article · Tue Mar 31 23:00:00 EST 1987 · Astron. J.; (United States)

DOI:https://doi.org/10.1086/114374· OSTI ID:6320284

Duric, N; Gregory, P C; Taylor, A R

Two-epoch VLA observations of seven variable radio sources from the galactic plane survey of Gregory and Taylor (1981) are presented. Three of the sources are found to be highly variable. They exhibit inverted spectra between 6 and 20 cm and are unresolved to 0.07-0.1 arcsec. Four other sources have morphologies reminiscent of jets and lobes and exhibit no structural changes between the two epochs. All sources contain at least one compact component, and in the case of the double and triple sources comparisons with survey data suggest that these undergo transient and dramatic changes in flux. The object GT 2203 + 559 presents the exciting possibility of another Sco X-1 candidate. Two sources have close optical counterparts. 12 references.

• Research Organization: British Columbia Univ., Vancouver; Groningen Rijksuniversiteit, Netherlands
• OSTI ID: 6320284
• Journal Information: Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 93; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
640105 -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC RADIO SOURCES
GALAXIES
MILKY WAY
SPECTROPHOTOMETRY
STARS
TIME MEASUREMENT
VARIABLE STARS
VARIATIONS