G. R. Riegler, P. C. Agrawal and M. J. Rosker, Jet Propulsion Laboratory, report the detection of low-energy x-radiation from the vicinity of PKS 0548-322 with the HEAO-A2 energy detectors. During observations around 1977 Sept. 19 and 1978 Mar. 17 the ecliptic latitude of the observed source was 2-sigma away from the ecliptic latitude of the center of 4U 0543-31 and was consistent with that of the BL-Lac candidate PKS 0548-322 (suggested by R. Mushotsky, Goddard Space Flight Center). Assuming a thermal spectrum of temperature 4 x 10**6 K and column density 4 x 10**20 H cm**-2, a flux of 4 x 10**-11 erg cm**-2 s**-1 was observed at 0.15-3 keV, including a flux of 1 x 10**-11 erg cm**-2 s**-1 at 0.15-0.4 keV.
International Astronomical Union Circular
- Pub Date:
- September 1978