Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1314s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 102, Oct. 1991, p. 1314-1334. Research supported by University of California.
Astronomy and Astrophysics
Astrophysics
44
Galactic Clusters, Nebulae, X Ray Sources, Cooling Flows (Astrophysics), Elliptical Galaxies, H Alpha Line, Interstellar Gas
Scientific paper
This paper presents the results of an H-alpha + N II forbidden line narrowband imaging survey of X-ray-selected E and S0 galaxies. A novel technique is described for objectively optimizing the removal of stellar continuum light while providing well-defined estimates of systematic errors. The procedure has the additional benefit of eliminating sky contamination, specifically in image regions occupied by galaxy light. Consideration of the measured spectral energy distributions is included in the flux calibration procedure, and emission-line luminosities (or upper limits), corrected for Galactic foreground extinction, are tabulated for metric apertures. No connection is found between the 'boxiness' or 'diskiness' of stellar isophotes and emission-line or far-infrared luminosity. It is suggested that optical nebulosity in early-type galaxies contains a significant multiparameter dependence on active Galactic nuclei behavior, accretion from the hot interstellar medium, and mass injection from external sources.
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