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25 April 2024 |
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Herschel-ATLAS/GAMA: What determines the far-infrared properties of radio-galaxies? | | Jasmeer Virdee
; Martin Hardcastle
; Steven Rawlings
; Dimitra Rigopoulou
; Tom Mauch
; Matt Jarvis
; Aprajita Verma
; Daniel Smith
; Ian Heywood
; Sarah White
; Martin Baes
; Asantha Cooray
; Gianfranco De Zotti
; Steve Eales
; Michal Michalowski
; Nathan Bourne
; Ali Dariush
; Loretta Dunne
; Rosalind Hopwood
; Eduardo Ibar
; Steve Maddox
; Matthew Smith
; Elisabetta Valiante
; | | Date: |
25 Mar 2013 | | Abstract: | 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 0.89pm0.18 and 0.49pm0.12 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. | | Source: | arXiv, 1303.6329 | | Services: | Forum | Review | PDF | Favorites | |
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