Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.285..580c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 285, Issue 3, pp. 580-592.
Astronomy and Astrophysics
Astronomy
18
Galaxies: Clusters: General, Cooling Flows, Quasars: Emission Lines, Quasars: General, Quasars: Individual: 3C254, X-Rays: Galaxies
Scientific paper
We present two-dimensional fibre spectroscopy of the spectacular extended emission-line region surrounding the z=0.734 radio-loud quasar 3C254, and archival ROSAT PSPC data of this source. We confirm that the emission-line nebula is extended over at least 80 kpc, and its morphology is strongly correlated with the radio source structure. The kinematics and intensity of the emission lines ~15 kpc (1.5 arcsec) east of the quasar core strongly indicate an interaction of a radio jet with a dense cloud. Evidence for a high-pressure confining medium comes from the low ionization state of the nebula, given the proximity of the luminous quasar. Over 70 per cent of the total [Oii] lambda3727 luminosity is emitted from the extended emission-line region, but the majority of the [Oiii] lambda5007-line luminosity is from the nucleus. No major ionization change is seen in the nebula at the position of the jet-cloud interaction, but a small region ~1.4 arcsec west of the quasar nucleus shows a markedly higher ionization state. The X-ray spectrum is well- fitted by a power-law with energy index Gamma~2.3, without any excess absorption, and a thermal cluster contribution to the spectrum is also allowed. The emission-line nebula associated with 3C254 shares many of the orientation-independent characteristics of powerful radio galaxies at similar, and higher, redshifts, and strongly supports models seeking to unify the two through orientation to the observer.
Crawford Carolin S.
Vanderriest Ch.
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