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Paper: A Radio, Millimeter and IR Study of z ≈ 2 Luminous QSOs
Volume: 373, The Central Engine of Active Galactic Nuclei
Page: 747
Authors: Petric, A.O.; Carilli, C.L.; Mason, R.E.; Bertoldi, F.; Beelen, A.; Cox, P.; Omont, A.; Helfand, D.
Abstract: We present Very Large Array observations at 1.4 and 5 GHz of a sample of 16 QSOs at z=1.78-2.71. Half of the chosen quasars are bright at millimeter wavelenghts (250 or 350 GHz),while the other half were not detected at millimeter wavelengths; the former QSOs were detected at 1.4 GHz, in most cases at high significance (S/N ≥7), but only three of the latter sources were detected at radio frequencies, and only at lower significance (S/N ~3). The data are consistent with a correlation between the millimeter and radio fluxes, indicating a physical connection between the mechanisms responsible for the radio and millimeter emission. All the sources detected at 1.4 GHz are spatially unresolved, with size limits typically less than ~ 6 kpc. High star formation rate galaxies at low redshift are typically nuclear starbursts, with sizes ≥ 1 kpc. Hence, the current radio size limits are insufficient to constrain the emission model (AGN or starburst). A preliminary look with the IRS at four of our IR luminous systems did not find 3.3 micron PAH emission line in these objects.
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