K. A. Pounds, Department of Physics, University of Leicester, Leicester LE1 7RH, England (telex 341664 LUXRAY G), communicates: "The Ariel 5 sky-survey instrument has begun an extended observation of four active galaxies, viz. Mk 421, NGC 4151, NGC 5548 and NGC 7592, as well as of the group NGC 5920, all of which are known x-ray emitters. The observations will continue for 3-5 weeks, and overlapping optical, infrared or radio photometry would be of considerable interest. For further information please contact me."
International Astronomical Union Circular
- Pub Date:
- January 1978