Investigation%20of%20different%20types%20radio%20sources%20by%20IPS%20method%20at%20111MHz

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Investigation of different types radio sources by
IPS method at 111MHz

• S.A.Tyulbashev
• Pushchino Radio Astronomy Observatory, Astro
  Space Center of P.N.Lebedev Physical Institute

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Plan of report

• Introduction
• Samples (CSS, GPS, FSS, Core dominated
  .sources, the sources of IPS survey)
• Sensitivity of observations
• What are the base objects observations at 111MHz?
• Physical conditions in compact details of sources
• Conclusion

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Two applications of IPS method

• Standard application The sources are candles for
  solar wind
• Other application If we know the medium we can
  estimate flux densities of compact details of
  sources.

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Why we investigate sources?

• Cosmology of compact radio sources
• Estimations of physical conditions in compact
  details of sources

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Cosmology of compact radio sources

• All results are published (ArtyukhTyulbashev -
  11 papers).
• Main conclusion Cosmological evolution of
  compact and extended radio sources are different.

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Sensitivity of IPS observations at Large Phased
Array
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• 395 scintillating sources were founded in
  Pushchino IPS survey
• 380 compact sources from 395 were detected first
  time
• we believe 15000-20000 scintillating sources at
  100MHz on the north sky

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• Quasars with steep spectrum of compact
  (scintillating) components are more probable
  candidate for optical identification (Tyulbashev
  S.A., Astron.Rep., 1997,41,723)
• optical identifications have 46 sc.sources of
  survey. Red shifts were founded 27 sources.
  Quasars are 60 and compact (lt3) radio galaxies
  are 40
  (Artyukh V.S. et al.,
  AA,2003,403,555 Kopylov A.I.
  et al., AA,2004,421,455)

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Different types of objects
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Physical parameters from observations
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variability at 15GHz (Kovalev Y.Y. et al.,
2005,AJ,130,2473)
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Equipartition or not equipartition
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Conclusion

• More then 95 of all scintillating (at 111MHz)
  sources have not high angular resolution
  observations at high frequencies
• Most part of scintillating sources have steep
  spectra for compact and extended components
• Investigation of physical condition of compact
  sources give us results which not agrees with
  hyphothesis of equipartition between energy
  magnetic field and energy of relativistic
  particles