The nebulosity near the quasar 3C 249.1

Details The nebulosity near the quasar 3C 249.1 The nebulosity near the quasar 3C 249.1

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213....8r&link_type=abstract

Astrophysical Journal, Part 1, vol. 213, Apr. 1, 1977, p. 8-14.

Astronomy and Astrophysics

Astrophysics

47

Astronomical Spectroscopy, Nebulae, Quasars, Red Shift, Emission Spectra, Forbidden Bands, Galactic Radiation, Gravitational Effects, H Beta Line, Line Spectra, Neon, Oxygen Spectra, Spectrophotometry

Scientific paper

Spectroscopic observations made 2 arcsec away from 3C 249.1 with a cooled SIT camera spectrograph and with a multichannel spectrometer yield convincing evidence for the presence of fairly narrow emission lines of forbidden O II, forbidden O III, forbidden Ne III, and perhaps H-beta. The redshift of these emission lines, z = 0.3125, is, within the accuracy of the observations, the same as that of the broad emission lines in the quasar itself; this appears to rule out a gravitational-redshift interpretation for the quasar redshift. The main difficulty in making models for the extended emission-line region is that of understanding the strong forbidden O II lines. For this purpose, shell, cloud, and disk models are discussed, as is time-dependent ultraviolet illumination of the nebula. Simple models, in which the nebular is exposed to the unaltered extrapolated quasar continuum flux, fail to produce the observed line ratios.

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