Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ap%26ss.197...77s&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 197, no. 1, p. 77-86.
Astronomy and Astrophysics
Astrophysics
3
Galactic Nuclei, H Alpha Line, Interstellar Gas, Kinematics, Seyfert Galaxies, Astronomical Spectroscopy, Charge Coupled Devices
Scientific paper
Spectra of the Seyfert galaxy nucleus NGC 4151 obtained in the Crimean Astrophysical Observatory in 1988-1990 is described focusing on significant variations in continuum intensity and broad H-alpha line profile. It is noted that different parts of the profile vary in different ways. Smaller changes are located at far-away regions of the wings and at low positive velocities of the profile. Lower variations in the red part of the H-alpha profile near the center are interpreted by the delay effect in an expanded shell. Cross correlation analysis reveals shorter delay for the higher velocities of the H-alpha profile.
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