Observation of galactic soft x-ray by LEINAX-3

The purposes of the observation are to calibrate the instrument with X-ray from Crab Nebula, to search for X ray from MONOCEROS supernova, to investigate the structure and the energy spectrum in the strong X-ray regions in Gemini and Eridanus, and to search for X ray from Orion region. The soft X ray detectors employed in the present observation were eight membrane proportional counters and a multi-wire proportional counter. To improve the energy resolution, 1 μm, 1.5 μm and 3 μm thick polypropylene filters and 120 μg/cm2 thick boron filter were used. The effective area of one proportional counter was 134 cm2 and soft X-ray between 0.4 and 2 keV was detected. The sandhawk rocket was launched on Nov. 9, 1974, and the aspect control was made. The expected observation was made. (J.P.N.)