GINGA observation of X-ray emission from the dark cloud Lynds 1457.
Abstract
Hard X-ray emission above 2 keV from the dark cloud Lynds 1457 was observed with the large-area counters on the Ginga satellite. A remarkable variation of the X-ray intensity was discovered on short time scales down to 100 sec. The X-ray spectrum was significantly harder (kT = about 17 keV in thermal bremsstrahlung) than those of the previously observed star-formation regions and exhibited a heavy low-energy cutoff, corresponding to a hydrogen equivalent column density of 10 to the 23rd/sq cm.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- 1989
- Bibcode:
- 1989PASJ...41..651T
- Keywords:
-
- Ginga Satellite;
- Pre-Main Sequence Stars;
- Satellite Observation;
- Star Formation;
- X Ray Sources;
- X Ray Spectra;
- Bremsstrahlung;
- Japanese Space Program;
- Proportional Counters;
- Satellite-Borne Instruments;
- Astrophysics