A fast-moving knot of radio emission in the active galaxy NGC 1275

Abstract

view Abstract Citations (26) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Fast-moving Knot of Radio Emission in the Active Galaxy NGC 1275 Marr, Jonathan M. ; Backer, Donald C. ; Wright, Mel C. H. ; Readhead, Anthony C. S. ; Moore, Richard Abstract We have mapped the nearby (z = 0.018) active galaxy NGC 1275 (3C 84) at six different epochs from 1981 to 1986 at 1.3 cm (22.3 GHz) with a global VLBI array of seven telescopes. In this paper we describe a long-lived knot of emission separating from the main radio component with a projected velocity of 0.49 +/- 0.10h^-1^c. This knot moves through diffuse emission that also moves away from the main component with a slower projected velocity of 0.33 +/- 0.13h^-1^c. We show that the knot and diffuse emission are associated with flux-density increases that occurred around 1968 and 1959, respectively. We discuss the observations in terms of a core-jet model and propose that the jet collimation has increased over the lifetime of the present activity. Publication: The Astrophysical Journal Pub Date: February 1989 DOI: 10.1086/167138 Bibcode: 1989ApJ...337..671M Keywords: Active Galaxies; Peculiar Galaxies; Radio Sources (Astronomy); Astronomical Models; Flux Density; Very Long Base Interferometry; Astrophysics; GALAXIES: INDIVIDUAL NGC NUMBER: NGC 1275; GALAXIES: NUCLEI; GALAXIES: SEYFERT; GALAXIES: STRUCTURE; INTERFEROMETRY; RADIO SOURCES: GALAXIES full text sources ADS | data products SIMBAD (1) NED (1)