A New Interpretation of the Aligned Structures of the Z=1 Radio Galaxy 3C356

Details A New Interpretation of the Aligned Structures of the Z=1 Radio Galaxy 3C356 A New Interpretation of the Aligned Structures of the Z=1 Radio Galaxy 3C356

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.270..431l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 270, NO. 2/SEP15, P. 431, 1994

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Scientific paper

We present long-slit optical spectra of the z ~ 1 radio galaxy 3C 356, which are used to suggest a new explanation of its highly peculiar properties. We find that the ultrahigh ionization narrow lines in component `a', a ~10^7^ M_sun_ cloud ~20 h^-1^ kpc from the nucleus, can be explained via photoionization by ~10^7^ K gas generated in shocks driven into the cloud by an interaction with the radio-source jet. The presence of a 4000-A break in the spectrum of the continuum light from `a' argues that red supergiant stars are also present in the cloud, implying that we are seeing the second episode of radio-source-cloud interaction, the first of which, coinciding with the birth of the radio source, was responsible for the star formation. A second cloud, `d', is seen 32 h^-1^ kpc from the nucleus, on the other side from `a' and accurately aligned along the axis joining `a' to the nucleus, suggesting that both clouds are interacting with precessing antiparallel jets for the second time. Our model also explains the X-ray emission from the 3C 356 system, the high speeds of clouds `a' and `d' with respect to the nucleus, and the low carbon abundance in `a'. The implications of this model are that jet-induced star formation can lead to aligned near- infrared light within radio-source lifetimes as low as ~10^7^ yr, and that shocks induced by the radio jets can produce X-rays which photoionize off-nuclear gas.

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