Abstract
The x-ray astronomy satellite Ginga carries three scientific instruments, the Large Area proportional Counters (LAC), All Sky x-ray Monitor (ASM) and Gam ma-ray Burst Detector (GBD). The LAC is the main instrument with an effective area of 4000 cm2 giving it the highest sensitivity to hard x-rays so far achieved. Ginga observed about 250 targets up to the end of 1989. Important results are the discovery of cyclotron absorption features in x-ray spectra from several x-ray pulsars, the discovery of transient x-ray pulsars in the region of 5 kpc ring of the Galaxy, the discovery of diffuse iron line emission peaked at the Galactic center, the detection of x-ray scattering by cosmic dust grains, the discovery of red-shifted iron line emission from quasars, the detection of spectral structures and variations of Seyfert galaxies and the detection of x-rays from SN 1987A.
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