Implications of the ionizing continuum of 3C263

Details Implications of the ionizing continuum of 3C263 Implications of the ionizing continuum of 3C263

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..139c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Jan. 1, 1991, p. 139-147. Research supported by Ro

Astronomy and Astrophysics

Astronomy

9

Continuous Radiation, Ionized Gases, Molecular Clouds, Quasars, Emission Spectra, Exosat Satellite, Iue, Radio Emission, Ultraviolet Spectra

Scientific paper

UV IUE and soft X-ray Exosat observations of the quasar 3C263 reveal the low-energy part of the ionizing continuum and allow the high-energy tail to be strongly constrained. The ionizing spectrum confirms that the pressure of the extranuclear emission-line gas discovered earlier around the quasar is greater than 10 to the 6th/cu cm K at about 20 kpc. Plausible models of the spectrum imply that the pressure may be up to 10 times higher than this minimum. I- and R-band images of the quasar and the surrounding field confirm previous findings that the quasar is embedded in a moderately rich cluster. The I-band image shows the structure of the nebulosity around the quasar. The high pressure of the emission-line gas is attributed to confinement by dense cooling intracluster gas, qualitatively similar to that found in nearby clusters of galaxies, but of a greater magnitude. The minimum equipartition pressure of the resolved radio emission from the quasar is in agreement with the pressure profile inferred from the optical data.

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