Other
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1647t&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 101, May 1991, p. 1647-1658. ASI-supported research.
Other
71
Galactic Evolution, H Alpha Line, High Temperature Gases, Interstellar Gas, Astronomical Spectroscopy, Heao 2, Ionized Gases, Spectral Emission, X Ray Spectra
Scientific paper
H-alpha imaging observations of 13 early type galaxies with known X-ray fluxes are presented from the Einstein Observatory data, and long-slit spectroscopy of nine of these. H-alpha emission is detected in the central regions of ten objects. The line emission appears extended over a radius of 5-10 kpc, is generally peaked on the nucleus with regular elliptical isophotes, similar to the red continuum, although with a steeper radial distribution. Low surface brightness filamentary structure is also seen in a few cases (NGC 4406 and NGC 5846). To study the different phases of the interstellar medium in early type galaxies, the emissions due to hot (X-ray) and warm (H-alpha) gas are compared. On average, galaxies with a larger content of hot gas also show a more powerful line emission. However, the scatter in the relation is significant, and suggests that other parameters must play a role. The depth of the gravitational potential and/or the shape of the objects are probably important in determining the amount of gas present in early type galaxies.
di Serego Alighieri Sperello
Trinchieri Ginevra
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