Herschel-ATLAS/GAMA: What determines the far-infrared properties of
  radio-galaxies?
  We perform a stacking analysis of H-ATLAS data in order to obtain isothermal
dust temperatures and rest-frame luminosities at 250um (L250), for 1599 radio
sources over the H-ATLAS P1 GAMA area. The radio sample is generated using a
combination of NVSS data and K-band UKIDSS-LAS data, over 0.01<z<0.8. The FIR
properties of the sample are investigated as a function of L_1.4 GHz, z,
projected radio-source size and radio spectral index. In order to search for
stellar-mass dependent relations, we split the parent sample into those sources
which are below and above 1.5 L_{K}^{*}. Correcting for stellar mass and
redshift, we find no relation between the L250 and L_1.4GHz of radio AGN. This
implies that a galaxy's nominal radio luminosity has little or no bearing on
the SFR and/or dust mass content of the host system. The L250 of both the radio
detected and non radio-detected galaxies (defined as those sources not detected
at 1.4GHz but detected in the SDSS with r'<22) rises with increasing z. For
mass and colour matched samples, sub-1.5 L_{K}^{*} and super-1.5 L_{K}^{*}
radio-detected galaxies have 0.89\pm0.18 and 0.49\pm0.12 times the L250 of
their non radio-detected counterparts. We explain these results in terms of the
hotter, denser and richer halo environments massive radio-galaxies maintain and
are embedded in. These results indicate that all massive radio galaxies (>1.5
L_{K}^{*}) may have systematically lower FIR luminosities (~25%) than their
colour-matched non radio-detected counterparts. Compact radio sources (<30kpc)
are associated with higher L250s and dust temperatures than their more extended
(>30kpc) counterparts. The higher dust temperature suggests that this may be
attributed to enhanced SFRs, but whether this is directly or indirectly due to
radio activity (e.g. jet induced or merger-driven SF) is as yet unknown.
