X-Ray Nova in Scorpius
Abstract
R. M. Hjellming and M. Rupen, National Radio Astronomy Observatory, report the results of new Very Large Array radio observations of GRO J1655-40: "On Sept. 11.2 UT, a new addition to the radio counterpart of this x-ray transient appeared; this addition was seen as an added optically-thick component in the radio spectrum, with preliminary fluxes of 0.44, 0.41, 0.37, 0.3, and 0.25 Jy at 1.49, 4.9, 8.4, 14.9, and 22.5 GHz, respectively, for the total spectrum. It also appeared as a new source in 14.9- and 22.5-GHz images, with a location between the northeastern and southwestern components (IAUC 6073)." S. Sazonov and R. Sunyaev, Space Research Institute, Moscow, on behalf of the Granat WATCH team, report: "GRO J1655-40 appeared bright in observations by the Granat WATCH all-sky monitor on Sept. 6-12. Preliminary average flux estimates for Sept. 6-7, 8-9, and 9-12 are 490 +/- 30, 560 +/- 70, and 970 +/- 30 mCrab, respectively, in the energy band 8-20 keV. Such a strong continuous growth of the flux is rather unusual for x-ray novae. A sharp decrease in the intensity was observed when the flux dropped from 1100 +/- 130 mCrab on Sept. 8.6 UT to 290 +/- 90 mCrab on Sept. 8.7."
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- September 1994
- Bibcode:
- 1994IAUC.6077....1H