Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.334..591d&link_type=abstract
Nature (ISSN 0028-0836), vol. 334, Aug. 18, 1988, p. 591-593.
Astronomy and Astrophysics
Astronomy
59
Astronomical Photography, Emission Spectra, Radio Galaxies, Radio Sources (Astronomy), Bandpass Filters, Charge Coupled Devices
Scientific paper
In some radio galaxies and quasars, there is evidence that highly excited gas is associated with the transport of energy from the active nucleus of the galaxy out to the extended radio structures. In one such case, the radio galaxy PKS2152-69, Tadhunter et al. (1987) reported a blue continuum source coincident with the highest ionization region of a gas cloud at a projected distance of 8 kpc from the nucleus and lying approximately along the radio axis. Optical observations of the continuum are reported here which show that its spectrum rises into the near ultraviolet with f(v) proportional to v exp 3 + or - 1 and that its degree of polarization is about 10 percent with the electric vector perpendicular to the radius vector from the nucleus. It is proposed that a beamed nuclear source could excite the highly ionized extranuclear cloud and scatter off associated dust to produce the observed continuum.
Binette Luc
Courvoisier Thierry J. -L.
di Serego Alighieri Sperello
Fosbury Robert A. E.
Tadhunter Clive N.
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