Unveiling weak radio quasar population at z>=4 J/MNRAS/490/2542 ivo://CDS.VizieR/J/MNRAS/490/2542 doi:10.26093/cds/vizier.74902542 CDS Perger K. Frey S. Gabanyi K.E. Toth L.V. 2024-08-20T20:13:46Z 2023-03-21T13:09:47Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr active-galactic-nuclei redshifted radio-sources We applied image stacking on empty field Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) survey maps centred on optically identified high-redshift quasars at z>=4 to uncover the hidden {mu}Jy radio emission in these active galactic nuclei (AGN). The median stacking procedure for the full sample of 2229 optically identified AGN uncovered an unresolved point source with an integrated flux density of 52{mu}Jy, with a signal-to-noise ratio ~10. We co-added the individual image centre pixels to estimate the characteristic monochromatic radio power at 1.4GHz considering various values for the radio spectral index, revealing a radio population with P_1.4GHz_~10^24^W/Hz. Assuming that the entire radio emission originates from star-forming (SF) activity in the nuclear region of the host galaxy, we obtained an upper limit on the characteristic star formation rate, ~4200M_{sun}_/yr. The angular resolution of FIRST images is insufficient to distinguish between the SF and AGN origin of radio emission at these redshifts. However, a comparison with properties of individual sources from the literature indicates that a mixed nature is likely. Future very long baseline interferometry radio observations and ultradeep Square Kilometre Array surveys are expected to be sensitive enough to detect and resolve the central 1-10kpc region in the host galaxies, and thus discriminate between SF and AGN related emission. 2019MNRAS.490.2542P https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/490/2542 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/490/2542 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/490/2542 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/490/2542 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/490/2542 https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/490/2542 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/490/2542 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/MNRAS/490/2542/table1 (The AGN used for the stacking analysis) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/490/2542/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/490/2542/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/490/2542/table1? 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28542-28543 28548 28554 28557 28560 28563 28572 28594 28607 28612 28614 28631 28634 28638-28639 28644 28654-28657 28659 28664 30029 30035-30037 30039 30045 30065 31310 31326 31373 31375 31379 31386 31388 31393 31408-31409 31411 31413 31415 31417 31420 31422 31426 31437 31449 31464 31472 31478 31481-31482 31485 31529 31539 31625-31626 31630-31631 31652 31660 31665 31668-31669 31673 31691 31698-31699 31705-31706 31712 31727 31738 31740-31741 32395-32396 32409 32438 32489 32492 32502 32508 32511 32683 36725 36765-36766 36785 36792 36799 36802 36810 36816 36834 36847 36854 36862 40924 40932 40934 40940 44921 44984 45045 49019 49097 49100 49118 49128 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/490/2542?format=ascii Radio default J/MNRAS/490/2542/table1 The AGN used for the stacking analysis SimbadName Simbad column added by the CDS meta.id char nullable recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Name AGN name meta.id;meta.main char RAJ2000 Right ascension (J2000) pos.eq.ra;meta.main DEJ2000 Declination (J2000) pos.eq.dec;meta.main z Spectroscopic redshift src.redshift float ref Literature reference of discovery (bibcode) meta.ref;pos.frame char