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Date and Time of the Query: 2019-06-16 T04:33:37 PDT
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For refcode 1990MNRAS.242..262H:
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Copyright by Royal Astronomical Society. 1990MNRAS.242..262H Coded mask X-ray images of the Virgo cluster - I. Hard X-rays from the Seyfert galaxy NGC 4388 C. G. Hanson, G. K. Skinner, C. J. Eyles and A. P. Willmore School of Physics and Space Research, University of Birmingham, PO Box 363, Edgbaston, Birmingham B15 2TT Accepted 1989 June 23. Received 1989 June 5 SUMMARY Spectrally resolved hard X-ray (2-32 keV) images of the Virgo cluster of galaxies were obtained with the University of Birmingham coded mask X-ray telescope on Spacelab-2 mission. The images demonstrate that much of the hard X-ray emission previously reported from the cluster originates in NGC 4388 which has been described on the basis of optical observations as a type 2 Seyfert galaxy. Flux was detected from NGC 4388 in the energy range ~2-18 keV and has a spectrum consistent with that expected from a type 1 Seyfert, but with a very high hydrogen column density. Its luminosity in the 2-10 keV energy-band is ~10^42^ erg s^-1^ (assuming a distance of 20 Mpc). When combined with recent optical detections faint broad wings to the H{alpha} line, our results suggest that NGC 4388 should be classified as a narrow emission-line galaxy (NELG), a class of objects widely held to contain heavily obscured, low-luminosity type 1 Seyfert nuclei.
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