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Long Wavelength Spectral Studies of Giant Radio Galaxies

Study of giant radio galaxies 3C35 and 3C223 using observations at 74 and 327 MHz with VLA. New radio images and spectral behavior comparison. Long-wavelength observations differentiate radiative from adiabatic losses.

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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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