C. M. F. Galas, University of Calgary; and I. R. Tuohy and G. Garmire, California Institute of Technology, report the discovery of soft x-ray emission from the supernova remnant HB3 by the HEAO-A2 low-energy detectors. The preliminary flux in the energy range 0.6 to 2.2 keV is (6.4 +/- 0.7) x 10**-11 erg cm**-2 s**-1. No flux was detected below 0.6 keV. The error box is centered in the northwest part of the supernova remnant and includes the optical filaments which may be associated with HB3. There is no evidence for any angular extension of the source.
International Astronomical Union Circular
- Pub Date:
- August 1978