Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975mnras.172..289b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 172, Aug. 1975, p. 289-303. Research supported by the Science Research
Astronomy and Astrophysics
Astronomy
44
Astronomical Spectroscopy, Emission Spectra, H Lines, Quasars, Spectral Line Width, Astronomical Models, Balmer Series, Digital Techniques, Forbidden Transitions, Image Tubes, Photoionization
Scientific paper
Results are reported for an intensive spectrometric study of 3C 273 using a digital image tube. Substantially improved spectra were obtained, especially of the blue region, and previously undetected features were observed. Emission-line equivalent widths are calculated and compared with recent photoionization models. The ion number density is estimated from the forbidden-line intensities. The derived upper limit on the intensity ratio of the 3426-A Ne V forbidden line to the 3868-A Ne III forbidden line indicates that the helium/hydrogen ratio is greater than 0.01. It is shown that the broad emission feature previously identified as the sodium D-lines is more probably attributable to He I. The Balmer decrement is found to be considerably steeper than that predicted from pure radiative recombination theory. On the whole, the spectrum of this quasar is found to be very similar to that of some very luminous Seyfert galaxies.
Boksenberg Alec
Fosbury Robert A. E.
Penston Michael V.
Savage Alistair
Shortridge Keith
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