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Date and Time of the Query: 2019-05-20 T08:35:09 PDT
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For refcode 2000AJ....119.1123H:
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Copyright by American Astronomical Society. Reproduced by permission
2000AJ....119.1123H COMPLEX EXTENDED LINE EMISSION IN THE cD GALAXY IN ABELL 2390 J. B. HUTCHINGS Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council of Canada, 5071 West Saanich Road, Victoria, BC V8X 4M6, Canada AND M. L. BALOGH Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC V8W 3P6, Canada Received 1999 July 28; accepted1999 December 1 ABSTRACT This paper reports maps of the cD galaxy in the rich z = 0.23 cluster Abell 2390 at UV, [O II], Ly{alpha}, and H{alpha} wavelengths. Spatially resolved UV and optical spectra were obtained with Space Telescope Imaging Spectrograph on the Hubble Space Telescope; the 2" wide slit was aligned close to the long axis and blue lane of the galaxy and includes all the inner bright features seen in Wide Field Planetary Camera 2 images. The Ly{alpha} is seen in emission from several bright knots and over an extended region from 4" northwest to 2" southeast of the nucleus. Three of these knots have detected UV continuum as well. H {alpha} images were obtained with OSIS at the Canada-France-Hawaii Telescope; both H{alpha} and [O II] show extended emission that roughly trace Ly{alpha}, primarily to the northwest. Notable differences between the spatial distributions of H{alpha}, Ly{alpha}, and [O II] emission and the blue knots in the galaxy may be the result of nonhomogeneous dust extinction or variations in ionization. The Ly{alpha} emission velocities depend on the uncertain identification with features in the undispersed images; there is strong evidence for resolved emission knots to have high velocities, >~1000 km s^- 1^, indicative of infall. The Ly{alpha} spectrum shows a sharp cutoff which may be due to absorption; we entertain the possibility that this edge is due to a shell of absorbing gas outflowing at about 5000 km s^-1^. Key words: galaxies: clusters: individual (Abell 2390)-cooling flows
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