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Date and Time of the Query: 2019-06-25 T12:34:28 PDT
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For refcode 1989AJ.....97..686A:
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1989AJ.....97..686A HIGH-RESOLUTION SPECTROSCOPY OF THE NARROWLINE REGION OF A SEYFERT 2 GALAXY, NGC 4388 KAZUYA AYANI Department of Astronomy, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan MASANORI IYE National Astronomical Observatory, Mitaka, Tokyo 181, Japan and European Southern Observatory, D-8046 Garching bei Munchen, Federal Republic of Germany Received 9 September 1988; revised 15 November 1988 ABSTRACT We obtained high-resolution spectra of the central region of NGC 4388 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 [O III] {lambda} 5007, 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 [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 (N_e_ ~300 cm^-3^) are found, while the broad component corresponds to a rather small region confined to the center, where denser clouds (N_e_ ~10^3^ cm^-3^) 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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