J-GLOBAL ID:200904055926440843  Research Project code:9800033918 Update date:Jan. 19, 2004

Study of cosmic X-ray by 'ASCA'

Study period:1993 - 2002
Organization (1):
Investigating Researcher (40):
Research overview:
'ASCA' was the fourth X-ray astronomical satellite in Japan, and was the first X-ray satellite that could photograph up to the energy region as high as ca. 10 kilo electron volts. Although 'ASCA' went out of existence on March 2, 2001 on reentry into the aerosphere, study of cosmic X-ray using its archive data has still been continued. In fiscal 2002, study on radiation from a supernova remnant, exploration of X-ray emitting celestial body in Nobecula Minor, and study on radiation of iron emission line from an X-ray pulsar were carried out. Achievements of studies based on the data from 'ASCA' include: (1) detection of X-ray from supernova SN1993J which appeared in neighboring galaxy M81; (2) identification of a soft X-ray burst repeater as supernova remnant; (3) identification of ionized structure of hot gas spreading around galactic centers; (4) discovery of onion-like emission line structure from a supernova remnant; (5) discovery of proof for acceleration of cosmic ray in supernova remnant; (6) discovery of X-ray reflecting nebulae in galactic center; (7) precise determination of elementary composition ratio in an elliptic galaxy; (8) discovery of iron emission line from relativistic accretion disk of active galactic core; (9) precise measurement of structure of absorption line of active galactic core; (10) discovery of thermal structure of galaxy cluster; (11) spectral measurement of source of faint background X-ray emission; (12) discovery of absorption line from superluminal jet emitting star; (13) observation of X-ray afterglow of a gamma ray burst star; (14) detection of X-ray pulse from soft gamma ray burst repeater; (15) discovery of X-ray emission from protostar; (16) discovery of a number of X-ray pulsars from Magellanic Clouds; (17) discovery of layered structure of dark matter in galaxy cluster; and (18) discovery of non-thermally diffusing X-ray sources from galaxy cluster. In addition to these achievements, we have made large contribution to X-ray astronomy with over 1,200 papers published on peer-reviewed academic journals and with creation of more than 100 PhD's.
Keywords (7):
astronomical satellite ,  cosmic X-ray source ,  calibration ,  X-ray astronomy ,  supernova ,  resolving power ,  X-ray telescope
Research program: Ordinary Research
Ministry with control over the research :
Ministry of Education, Culture, Sports, Science and Technology

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