Physical conditions and the velocity fields in Seyfert 1 galaxies and QSOs

Journal Article · Sun Aug 01 04:00:00 EDT 1982 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/160145· OSTI ID:7041813

Shuder, J M

Measurements are presented which give the functional form of the H..beta../H..cap alpha.. and He I lambda5876/H..cap alpha.. ratios with cloud velocity in Seyfert 1 galaxies. Combined with present models of the line-emitting regions, these measurements indicate that the density or ionization parameter increases with increasing velocity. In addition, there is some evidence that the profiles of the Balmer lines become more uniform in the higher luminosity galaxies, which is consistent with the relative profiles of C IV lambda1549 and C III) lambda1909 in QSO's. Finally, arguments are presented which suggest that the line-emitting clouds with the highest velocities are located closest to the central source of ionizing radiation. Subject headings: galaxies: internal motions: galaxies: Seyfert: quasars

• Research Organization: Lick Observatory, Board of Studies in Astronomy and Astrophysics, University of California at Santa Cruz
• OSTI ID: 7041813
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 259:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640103* -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
640105 -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BALMER LINES
COSMIC RADIO SOURCES
EMISSION SPECTRA
GALAXIES
LINE WIDTHS
LUMINOSITY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
QUASARS
SEYFERT GALAXIES
SPECTRA