A new view of the galactic plane with EXOSAT

Astronomy and Astrophysics – Astronomy

Scientific paper

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Exosat Satellite, Milky Way Galaxy, X Ray Astronomy, Astronomical Coordinates, Diffuse Radiation, Stellar Radiation, X Ray Imagery

Scientific paper

A new X-ray image of the galactic plane has been produced using the 45 arcmin square field of view of the Medium Energy Instrument on EXOSAT. This image shows a total of 64 sources including 18 new ones which include the first observation of persistent emission from the globular cluster bursters Terzan 1 and Terzan 5. The most important discovery from this image is a 2° wide ridge of diffuse emission symmetrical about the plane and extending from the galactic centre to lII = ±40°. The spectrum of this emission appears to be hard (α ≡ 1.2) with no significant absorption.

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