the search of giant radio galaxies at declinations from 3 to 12 degrees
DESCRIPTION
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. What is giant radio galaxy?. The sizes are essentially more than sizes of parent galaxy - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/1.jpg)
THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM
3 TO 12 DEGREES
Pushchino Radio Astronomy Observatory of Astro Space
CenterTyul’bashev S.A., Gliantsev A.V.,
Butenko A.V.
![Page 2: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/2.jpg)
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
![Page 3: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/3.jpg)
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
![Page 4: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/4.jpg)
3C 236: 4 Mpc – largest object in Universe
![Page 5: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/5.jpg)
3C 35: 1 Mpc
![Page 6: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/6.jpg)
3C 219: 0.7 Mpc
![Page 7: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/7.jpg)
All pictures are from atlas Leahy http://www.jb.man.ac.uk/atlas/alpha.html
![Page 8: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/8.jpg)
Investigations of giant radio galaxies in Pushchino
• 3C 236, DA 240, 3C 31, 3C 219, NGC 315 and other
![Page 9: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/9.jpg)
3C 236, DA 240: Artyukh et al.,
PAZh, 1988, 14,706(Both source are extended for LPA)
![Page 10: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/10.jpg)
3C 31: Burch, MNRAS, 1977, 181, 599 (Cambridge One- Mile and 5 km telescopes)
![Page 11: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/11.jpg)
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.
![Page 12: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/12.jpg)
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);
![Page 13: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/13.jpg)
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)
![Page 14: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/14.jpg)
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;
![Page 15: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/15.jpg)
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);
![Page 16: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/16.jpg)
beams: 45’,45’,20-10’,1’,5’,3’
![Page 17: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/17.jpg)
beams: 45’,45’,20-10’,1’,5’,3’
![Page 18: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/18.jpg)
beams: 45’, 1’, 5’,6’, 3’
![Page 19: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/19.jpg)
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);
![Page 20: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/20.jpg)
TEXAS 0105+041 is largest source from investigated
![Page 21: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/21.jpg)
![Page 22: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/22.jpg)
![Page 23: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/23.jpg)
![Page 24: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/24.jpg)
![Page 25: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/25.jpg)
• The size of 4C+07.36 is 0.5-1Mpc
![Page 26: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/26.jpg)
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
![Page 27: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/27.jpg)
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
![Page 28: THE SEARCH OF GIANT RADIO GALAXIES AT DECLINATIONS FROM 3 TO 12 DEGREES](https://reader035.vdocuments.us/reader035/viewer/2022062517/568139b2550346895da14df5/html5/thumbnails/28.jpg)
Thank you