Discovery of a Hard X-Ray Flare from the Rho Ophiuchi Dark Cloud
Abstract
Hard X-rays above 1.5 keV were observed from the central region of the rho Ophiuchi dark could. The X-ray spectrum was fitted by a thin thermal model at a temperature of about 4 keV with the 1.5--10 keV band luminosity of 1.4 times 10(32) erg s(-1) . Iron K-shell emissions from highly ionized atoms were also observed. A flare-like event having a total luminosity of more than 10(35) erg with a decay time of a few hours was discovered.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- December 1992
- Bibcode:
- 1992PASJ...44L.255K
- Keywords:
-
- Dark Matter;
- Interstellar Matter;
- Ophiuchi Clouds;
- Pre-Main Sequence Stars;
- X Ray Spectra;
- Molecular Clouds;
- Star Formation;
- Stellar Flares;
- Astrophysics;
- INTERSTELLAR: CLOUDS;
- STARS: PRE-MAIN-SEQUENCE;
- STARS: X-RAYS;
- X-RAYS: SPECTRA