THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES

1. THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES Pushchino Radio Astronomy Observatory of Astro Space Center Tyul’bashev S.A., Gliantsev A.V., Butenko A.V.

2. What is giant radio galaxy? • The sizes are essentially more than sizes of parent galaxy • The emission in radio range is comparable with emission of typical quasars

3. DRAGNs – Double Radio Sourse Associated with Galactic Nuclei • DRAGNs as a rule have jets, hot spots, nuclei, radio clouds • Giant radio galaxies is some part of DRAGNs • DRAGNs are laboratory for investigation of extra galactic medium

4. 3C 236: 4 Mpc – largest object in Universe

5. 3C 35: 1 Mpc

6. 3C 219: 0.7 Mpc

7. All pictures are from atlas Leahy http://www.jb.man.ac.uk/atlas/alpha.html

8. Investigations of giant radio galaxies in Pushchino • 3C 236, DA 240, 3C 31, 3C 219, NGC 315 and other

9. 3C 236, DA 240: Artyukh et al., PAZh,1988, 14,706(Both source are extended for LPA)

10. 3C 31: Burch, MNRAS, 1977, 181, 599 (Cambridge One- Mile and 5 km telescopes)

11. 3C 31: Artyukh et al., PAZh, 1994, 20, 2583C 31 have angular sizes approximately two times more than at high frequencies. It means the size of 3C 31 is 1.5-2Mpc (one from largest for giant radio galaxies). The result was confirmed by Rudnick et al., AJ, 2009, 137, 145.

12. Intermediate conclusions: • the less frequency the large sources; • largest sources are extended for the Large Phased Array (beam 0.5*1 degrees); • interferometric systems are lost some part of extended emission; • the observations at interferometric system is worse than for antennas with full apertura (for search of giant radio galaxies);

13. Project: “Cosmic Weather” • Observations each day during a few years • From changing of scintillations of sources from day to day we estimate the station of Solar plasma (the report will be today)

14. Additional projects from observations • the search of compact (scintillating) radio sources (catalogue of sources - AGNs); • the search of large scale inhomogeneities of AGNs (voides in Universe); • the search of giant radio galaxies;

15. Selection: • Flux density more than 10 Jy; • Identification with 4C sources or TEXAS sources; • Spectra all these sources; • Test of spectral index (more than 2);

16. beams: 45’,45’,20-10’,1’,5’,3’

17. beams: 45’,45’,20-10’,1’,5’,3’

18. beams: 45’, 1’, 5’,6’, 3’

19. Possible explanations: • other large structure (Turte et al. MNRAS, 1962, 124, 459 – no structures at 178 MHz) • ultra steep spectrum (spectra is standard at high frequencies) ; • giant radio galaxies (best explanation);

20. TEXAS 0105+041 is largest source from investigated

25. The size of 4C+07.36 is 0.5-1Mpc

26. How much giant radio galaxies we can find at north sky? • If flux densities more than 3 Jy; • If logN/logS ~ 3/2; • If density of giant radio galaxies is constant; • We believe ~ 100-200 sources

27. Conslusion • The search of candidates to giant radio galaxies on the LPA at 111 MHz at declinations from 3o25’ to 12o40’ were made. • 4 giant radio galaxies were found

28. Thank you