Accretion Disk Structure and Kinematics of the Broad Line Regions in Selected AGN

Broad emission line regions in AGN are connected with the outer layers of accretion disks. This has been shown by means of line variability studies of individual AGN as well as line profile studies of AGN samples. We could model the broad-line profiles in AGN in a simple way only through rotational broadening of Lorentzian profiles. To individual emission lines belongs one typical Lorentz profile only with a fixed turbulence velocity: e.g., 500 km/s for Hβ, 3000 km/s for CIV λ1550. The rotation velocities in the broad line regions of the AGN range from 1000 to 7000 km/s.

Mesure des intensités des bandes d'absorption rovibrationnelles 0 → 4 et 0 → 5 de l'acide iodhydrique gazeux

By using a SISAM spectrometer with a 0.03 cm−1 resolving power we have measured the line-strengths for the 4 ← 0 and 5 ← 0 absorption bands of the HI molecule. The pressure in the White cell was important enough to assume the lines to be described through a Lorentz profile, and we have used the 'curve of growth' method. By using all the available data on the 1 ← 0,2 ← 0, and 3 ← 0 bands, we have calculated the first six coefficients of the dipole moment expansion series. The shape of the experimental dipole moment function shows that the HI bond is primarily covalent.