QSO 1612+261 - a case for varying He emission

Journal Article · Fri Jan 01 04:00:00 EST 1988 · Publ. Astron. Soc. Pac.; (United States)

DOI:https://doi.org/10.1086/132133· OSTI ID:7251826

Zheng, W

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 3889A. Such a line may be produced in optically thin clouds in which He I 5876A is not enhanced by collisional excitation. Another possible identification as the forbidden Ne III 3867 A line would suggest the existence of clouds of density 10 to the 7th/cu cm. The observations indicate that the broad-line region of this QSO may be on the order of a light-month. 11 references.

• Research Organization: California Univ., La Jolla (USA)
• OSTI ID: 7251826
• Journal Information: Publ. Astron. Soc. Pac.; (United States), Journal Name: Publ. Astron. Soc. Pac.; (United States) Vol. 100; ISSN PASPA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHARGED PARTICLES
COSMIC GASES
COSMIC RADIO SOURCES
DENSITY
EMISSION SPECTRA
FLUIDS
FLUX DENSITY
GASES
HELIUM IONS
IONS
PHYSICAL PROPERTIES
QUASARS
RADIANT FLUX DENSITY
SPECTRA