The QSO 1612+261 - A case for varying He emission?

Details The QSO 1612+261 - A case for varying He emission? The QSO 1612+261 - A case for varying He emission?

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100...63z&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, Jan. 1988, p. 63, 64.

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2

Emission Spectra, Helium Ions, Periodic Variations, Quasars, Radiant Flux Density, Spectral Line Width, Density Distribution, Molecular Clouds, Optical Thickness

Scientific paper

A broad emission feature, varying in less than five months, was observed in the spectrum of the QSO 1612+261 and may be identified as He I λ3889. Such a line may be produced in optically thin clouds in which He I λ5876 is not enhanced by collisional excitation. Another possible identification as [Ne III] λ3867 would suggest the existence of clouds of density 107cm-3. The observations indicate that the broad-line region of this QSO may be on the order of a light-month.

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