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Long Wavelength Spectral Studies of Giant Radio Galaxies

Long Wavelength Spectral Studies of Giant Radio Galaxies. Emanuela Orrù. University of Cagliari Osservatorio Astronomico di Cagliari (Italy). Collaborators: L. Feretti, M. Murgia, G. Giovannini, F. Govoni N. Kassim, W. Lane, R. Perley. IAU GA, Prague, 21 August 2006. Overview.

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Long Wavelength Spectral Studies of Giant Radio Galaxies

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  1. Long Wavelength Spectral Studies of Giant Radio Galaxies Emanuela Orrù University of Cagliari Osservatorio Astronomico di Cagliari (Italy) Collaborators:L. Feretti, M. Murgia, G. Giovannini, F. Govoni N. Kassim, W. Lane, R. Perley. IAU GA, Prague, 21 August 2006

  2. Overview z LAS LLS P178 GRS: 3C35 0.067 635 1.1 Mpc 1.2·1026 W Hz-1 3C223 0.1368 306 1.0 Mpc 7.7·1026 W Hz-1 Observations at 74 and 327 MHz with theVery Large Array Spectral Analysis at 74, 327, 608 and 1400 MHz Results

  3. 3C35 327 MHz res 57"x52" rms 3.5mJy/beam 500 kpc 3C35 74 MHz res 92"X64" rms 90 mJy/beam 3C35 327 MHz res 28“X21" rms 1.3 mJy/beam

  4. 3C223 74MHz res 81“X71" rms 80mJy/beam 3C223 74MHz res 26“X24" rms 45mJy/beam 500 kpc 3C223 327MHz res 18“X16" rms 2mJy/beam 3C223 327MHz res 7“X6" rms 0.6mJy/beam

  5. P-L 4-P 57"X53" 93"X65" 3C35 L band NVSS

  6. P-L 4-P 7"X6" L band Leahy & Perley 1991 25"X24" 3C223

  7. 4-L P-L 4-P 3C35 4-P P-L 3C223 4-L

  8. core hot spot core hot spot

  9. inj0.7 inj0.7 3C35 3C223 inj0.4 inj0.5 inj  b tsyn vadv Beq 0.5 2 3.7 GHz 60 Myr 0.02 c 3.5 G 0.7 2.4 1 GHz 110 Myr 0.013 c 1.2 G

  10. Iradio N0B(+1)/2-(-1)/2L b >> 74 MHz N0B(+1)/2  (R/R0)-7 (=0.5)

  11. CONCLUSIONS: 3C35 & 3C223 New Radio Images at 74 & 327 MHz. Comparison of the spectral behaviour. More generally, we demonstrate that Long-Wavelength observations are a powerful tool to discriminate between Radiative losses and Adiabatic losses

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