Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296.1059s&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background p 1059-1064 (SEE N90-2
Astronomy and Astrophysics
Astronomy
Emission Spectra, Galactic Structure, Luminosity, Virgo Galactic Cluster, X Ray Spectra, Brightness Distribution, H Alpha Line, Seyfert Galaxies, X Ray Astronomy
Scientific paper
The observations made by an X-ray telescope, flown on the Spacelab-2 Mission, of a number of clusters of galaxies are presented. Spectrally resolved images of a 6 degree square field of view in an energy range 2.5 to 32 keV were obtained. A number of serendipitous sources were detected. One such source is identified with NGC4388, a galaxy in the Virgo cluster, classified optically as a type 2 Seyfert. The hard X-ray spectrum indicates a high luminosity coupled with a high column density. A detection of faint broad wings to the H alpha line suggests that the galaxy should be reclassified as a NELG. Observations restricted to the energy range of grazing incidence telescopes such as Einstein and EXOSAT may give a misleading impression of the luminosity function of Active Galactic Nuclei (AGN).
Hanson C. G.
Skinner Gerald K.
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