Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292l..13m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 2, p. L13-L16
Astronomy and Astrophysics
Astronomy
29
High Temperature Plasmas, Interstellar Matter, Luminosity, Photoionization, Seyfert Galaxies, Virgo Galactic Cluster, X Ray Astronomy, X Ray Sources, Computer Programs, Ginga Satellite, Heao 2, Proportional Counters, Rosat Mission, X Ray Imagery
Scientific paper
Extended (R approximately 4.5 kpc) X-ray emission in the Seyfert 2 galaxy NGC 4388 has been discovered with the ROSAT High Resolution Imager (HRI). No evidence for a nuclear, unresolved component has been found; the upper limit for such a component is about 20% of the total flux. The interpretation of the extended emission in terms of nuclear radiation scattered by a plasma ionized by the nuclear photons can be excluded on the basis of a simple photoionization calculation. The two most likely alternatives, i.e. thermal emission from a collisionally heated plasma and the sum from many unresolved discrete sources, are briefly discussed.
Antonelli Lucio Angelo
Fink Henner
Matt Giorgia
Meurs Evert J. A.
Perola Giuseppe Cesare
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