High-resolution spectroscopy of the narrowline region of a Seyfert 2 galaxy, NGC 4388

Details High-resolution spectroscopy of the narrowline region of a Seyfert 2 galaxy, NGC 4388 High-resolution spectroscopy of the narrowline region of a Seyfert 2 galaxy, NGC 4388

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..686a&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, March 1989, p. 686-699.

Astronomy and Astrophysics

Astronomy

6

Astronomical Spectroscopy, Seyfert Galaxies, Virgo Galactic Cluster, Echelle Gratings, Electron Density (Concentration), Emission Spectra, Line Spectra, Narrowband, Spatial Distribution, Spectral Line Width

Scientific paper

High-resolution spectra of the central region of NGC 4388 were obtained with the ESO Cassegrain echelle spectrograph (CASPEC) mounted on ESO 3.6 m telescope. The spectral resolution, the slit length projected on the sky, and the seeing size were 0.5 A, 12 arcsec, and 2.5 arcsec, respectively. The emission-line profiles of forbidden O III 5007 A, H-beta, etc., along three slit position angles were analyzed by decomposition into a few Gaussian components. The spatial distributions of the flux and the velocity of these components, and their forbidden S II line-intensity ratios, show that the narrowline region of NGC 4388 consists of two main components. The narrow, blueshifted component corresponds to a spatially extended region where low-density clouds are found, while the broad component corresponds to a rather small region confined to the center, where denser clouds are found. A correlation between the peak velocity of emission lines and their ionization potential is found. This suggests that the velocity field of the low-density component is an accelerating outflow or a decelerating inflow.

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