Other
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..373..747p&link_type=abstract
The Central Engine of Active Galactic Nuclei, ASP Conference Series, Vol. 373, proceedings of the conference held 16-21 October,
Other
Scientific paper
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.
Beelen Alexander
Bertoldi Frank
Carilli Chris L.
Cox Pierre
Helfand David
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