MODULATION INDEX – GALACTIC LATITUDE RELATION G. Tsarevsky ASTRO SPACE CENTER, Moscow.

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Presentation transcript:

MODULATION INDEX – GALACTIC LATITUDE RELATION G. Tsarevsky ASTRO SPACE CENTER, Moscow

EXTRAGALACTIC SOURCES RADIO VARIABILITY

INTRINSIC?

EXTRAGALACTIC SOURCES RADIO VARIABILITY INTRINSIC? EXTRINSIC?

QSO is an essentially variable stuff!

It should vary in radio as well !

It should vary in radio as well, and it really vary!

Blazar Green Bank Interferometer data Intrinsic variation is over month to year, stronger at 8 GHz. ISS is the variation over day to week, stronger at 2 GHz

H. D. Aller, M. F. Aller, Ph. A. Hughes, G. E. Latimer: University of Michigan Radio Observatory (UMRAO) Database 26-m dish; 4.8, 8.0, 14.5 GHz (including polarisation!), 25 years E. B. Waltman et al., ApJS 77, 379, 1991: Green Bank Interferometer (GBI) Daily Observations Database 2.25 and 8.3 GHz, 17 years

ISS Geometry From Radio Galaxy Quasar or AGN 2000 pc

Center  Anticenter  Poles: Center  Anticenter  Poles: ↓ C > AC > Poles

What about m - |b| plot behavior?

ApJ 618, , 2004 Radio Variability of Radio Quiet and Radio Loud Quasars Richard Barvainis Joseph Leh´ar Mark Birkinshaw Heino Falke Katherine M. Blundell

ApJ 618, , 2004 Radio Variability of Radio Quiet and Radio Loud Quasars Richard Barvainis Joseph Leh´ar Mark Birkinshaw Heino Falke Katherine M. Blundell Subject headings: Quasars; Active Galaxies; Radio Emission

VLA monitoring of RLQ and RQQ

Some refs: N. Shapirovskaya, O.B. Slee, P. Hughes, & G. Tsarevsky "Radio Source Variability as a Tool for Very High Resolution" In: Proc. IAU Symposium No. 158, Sydney, eds. J. Robertson & W. Tango, Kluwer Acad. Press, 1993, p N. Shapirovskaya, O.B. Slee, & G. Tsarevsky "Galaxy Centre-Anticentre Asymmetry of the LFV Radio Source Distribution : Evidence of the Interstellar Matter Influence" In: Sub-arcsecond Radio Astronomy, eds. R. Davies & R. Booth, CUP, 1993, p