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Dust and Ionized Gas in Active Radio Elliptical Galaxies

Published online by Cambridge University Press:  12 April 2016

D.A. Forbes ,
W.B. Sparks  and
F.D. Macchetto
D.A. Forbes
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore MD 21218* Institute of Astronomy, Madingley Road, Cambridge CB3 OHA, U.K.
W.B. Sparks
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore MD 21218*
F.D. Macchetto
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore MD 21218* Affiliated with the Astrophysics Division, Space Science Department, European Space Agency (ESA)

Abstract

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We present broad and narrow bandwidth imaging of three southern elliptical galaxies which have flat-spectrum active radio cores (NGC 1052, IC 1459 and NGC 6958). All three contain dust and extended low excitation optical line emission, particularly extensive in the case of NGC 1052 which has a large Hα + [Nil] luminosity. Both NGC 1052 and IC 1459 have a spiral morphology in emission-line images. All three display independent strong evidence that a merger or infall event has recently occurred, i.e., extensive and infalling HI gas in NGC 1052, a counter-rotating core in IC 1459 and Malin-Carter shells in NGC 6958. This infall event is the most likely origin for the emission-line gas and dust, and we a currently investigating possible excitation mechanisms (Sparks et al. 1990).

Type
V. Observations of Nuclear and Near-Nuclear Activity
Information
International Astronomical Union Colloquium , Volume 124: Paired and Interacting Galaxies , 1990 , pp. 431 - 435
Copyright
Copyright © NASA 1990

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