Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...368..167h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 368, Feb. 10, 1991, p. 167-172.
Astronomy and Astrophysics
Astrophysics
39
Active Galactic Nuclei, Emission Spectra, Interstellar Gas, Seyfert Galaxies, Interstellar Matter, Markarian Galaxies, Molecular Excitation, Photoionization
Scientific paper
High-resolution images have been obtained in the emission lines forbidden O III 4959 A, 5007 A and H-alpha + forbidden N II 6548 A, 6584 A for three Seyfert galaxies - Mrk 573, NGC 2110, and NGC 5252. In at least Mrk 573 and NGC 2110, the emission line and radio continuum axes are closely related. Maps reveal localized regions of high-excitation gas away from the nucleus of each galaxy. In all cases the off-nucleus excitation is comparable to or higher than that at the nucleus itself, which may reflect increases in the ionization parameter, the presence of optically thin clouds or extra heating sources for the gas. In Mrk 573 and NGC 5252, the distribution of the ionized gas resembles a pair of conical structures, each with its apex at the nucleus, implying preferential escape of ionizing photons in two oppositely directed cones. The possible significance that high-excitation gas around Seyfert nuclei is observed preferentially in host galaxies of type S0 is discussed.
Haniff Christopher A.
Ward Martin J.
Wilson Andrew S.
No associations
LandOfFree
High-excitation extranuclear gas in Seyfert galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with High-excitation extranuclear gas in Seyfert galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-excitation extranuclear gas in Seyfert galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1315929