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High Spatial Resolution Observations of the Quasar MR2251-178

Published online by Cambridge University Press:  04 August 2017

F. Macchetto ,
M.A.C. Perryman  and
S. diSerego-Alighieri
F. Macchetto
Affiliation:
Affiliated to Astrophysics Division, Space Science Department, European Space Agency Space Telescope Science Institute, 3700 San Martin Drive, Homewood Campus, Baltimore, MD 21218 USA
M.A.C. Perryman
Affiliation:
Affiliated to Astrophysics Division, Space Science Department, European Space Agency
S. diSerego-Alighieri
Affiliation:
Affiliated to Astrophysics Division, Space Science Department, European Space Agency Space Telescope-European Coordinating Facility, ESO, Garching, FRG

Abstract

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The possibility that quasars are activated by interactions between galaxies has received considerable attention following the discovery of extended emission surrounding many low and moderate redshift quasars, and the distored morphological appearances of some of these extensions. We have obtained high resolution narrow-band optical images of the field of the low-redshift quasar MR2251-178 which reveal, in addition to nebulosity closely associated with the quasar, diffuse line-emitting regions separated by up to 100 kpc from the nucleus but kinematically associated with it. We attribute these regions to density perturbations of the gaseous envelope or disc now known to rotate about this quasar, caused by a tidal interaction between the quasar and a nearby active galaxy in the same cluster. Limits of between 2–4 × 108 years can be placed on the time elapsed since this interaction.

Type
VI. Environmental Aspects of Nuclear Activity
Information
Symposium - International Astronomical Union , Volume 121: Observational Evidences of Activity of Galaxies , 1987 , pp. 385 - 394
Copyright
Copyright © Reidel 1987 

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