Name of the Speaker(s): Vigen Malumian
Title of the communication: Detection of Radio Halo of Markarian 421 with the RATAN -600 (co-author G. Ohanian)
Preliminary abstract (12 lines max.): A radio halo of Markarian 421 was detected with the radio telescope RATAN-600 at 3.95 Ghz. The half power angular size of these extended component of the radio emission is 2.7 +- 0.5 minutes of arc, flux density is 242 + 40 mJn. The radio halo of Mark 421 has been previously detected with the synthesis rado telescopes.