Extended soft X-ray emission in the Seyfert 2 galaxy NGC 4388 discovered with the ROSAT HRI.
Abstract
Extended (R~4.5kpc) X-ray emission in the Seyfert 2 galaxy NGC 4388 has been discovered with the ROSAT 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 likeb alternatives, i.e. thermal emission from a collisionally heated plasma and the sum from many unresolved discrete sources, are briefly discussed.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- December 1994
- Bibcode:
- 1994A&A...292L..13M
- Keywords:
-
- 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;
- Astrophysics;
- GALAXIES: INDIVIDUAL: NGC 4388;
- GALAXIES: SEYFERT;
- X-RAYS: GALAXIES