Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.235..183c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 235, Nov. 1, 1988, p. 183-192. SERC-supported research.
Astronomy and Astrophysics
Astronomy
36
Astronomical Spectroscopy, Cold Plasmas, Gas Flow, Quasars, Radio Galaxies, Gas Temperature, Red Shift
Scientific paper
Long-slit spectroscopy of a sample of 31 QSO and radio galaxies, mostly selected on the basis of their X-ray and radio properties, are presented in order to investigate any similarity of their surrounding nebulosity to emission-line gas around cooling flow galaxies at lower redshift. Nine objects (five QSO) show extended oxygen emission. For eight of these, a measurement or limit of the ratio of the redshifted forbidden O-III 5007A/forbidden O-II 3727A emission lines in the nebulosity is made, after removal of any spillover light from the nucleus. The ratio is compared with that expected from gas at the observed radius photoionized by the active nucleus in order to determine the density, and hence pressure, of the gas. Of the extended objects modeled, seven are consistent with the cooling flow hypothesis. Three objects, two of which are radio-quiet QSO, do not require a high gas density.
Crawford Carolin S.
Fabian Andrea C.
Johnstone R. M.
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