Discovery and characterization of 25 new quasars at 4.6 < z < 6.9 from wide-field multiband surveys

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dc.catalogadorjlo
dc.contributor.authorBelladitta, Silvia
dc.contributor.authorBañados, Eduardo
dc.contributor.authorXie, Zhang-Liang
dc.contributor.authorDecarli, Roberto
dc.contributor.authorOnorato, Silvia
dc.contributor.authorYang, Jinyi
dc.contributor.authorBischetti, Manuela
dc.contributor.authorOnoue, Masafusa
dc.contributor.authorLoiacono, Federica
dc.contributor.authorMartínez Ramirez, Laura Natalia
dc.contributor.authorMazzucchelli, Chiara
dc.contributor.authorDavies, Frederick B.
dc.contributor.authorWolf, Julien
dc.contributor.authorSchindler, Jan-Torge
dc.contributor.authorFan, Xiaohui
dc.contributor.authorWang, Feige
dc.contributor.authorWalter, Fabian
dc.contributor.authorMkrtchyan, Tatevik
dc.contributor.authorStern, Daniel
dc.contributor.authorFarina, Emanuele P.
dc.contributor.authorVenemans, Bram P.
dc.date.accessioned2026-01-14T13:41:12Z
dc.date.available2026-01-14T13:41:12Z
dc.date.issued2025
dc.description.abstractLuminous quasars at provide key insights into the early Universe. Their rarity necessitates wide-field multi-band surveys to efficiently separate them from the main astrophysical contaminants (i.e., ultracool dwarfs). To expand the sample of high- quasars, we conducted targeted selections using optical, infrared, and radio surveys, complemented by literature-based quasar candidate catalogs. In this paper, we report the discovery of \nqsos\ new quasars at (six at ), with between 25.4 and 27.0. We also present new spectra of six quasars we selected, but whose independent discovery has already been published in the literature. Three of the newly discovered quasars are strong radio emitters (L10erg s Hz). Among them, one source at exhibits typical blazar-like properties, including a flat radio spectrum, radio-loudness 1000, and multi-frequency variability. It is also detected by SRG/eROSITA X-ray telescope (ferg s cm). In addition, for seven quasars we present near-infrared spectroscopy and estimate the central black hole mass from their C and Mg broad emission this http URL masses (log[M]) and Eddington ratios () are consistent with other quasars reported in the literature. A quasar exhibits a velocity difference of approximately km s between the C and Mg emission lines, making it one of the most extreme C outflows currently known. Additionally, the sample includes three high-ionization broad absorption line quasars. One of these quasars shows potential evidence of an extremely fast outflow feature, reaching km s.
dc.fechaingreso.objetodigital2026-01-14
dc.format.extent25 páginas
dc.fuente.origenORCID
dc.identifier.doi10.1051/0004-6361/202554859
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202554859
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/107683
dc.information.autorucInstituto de Astrofísica; Martínez Ramirez, Laura Natalia; 0009-0003-5506-5469; 1183132
dc.language.isoen
dc.nota.accesocontenido completo
dc.revistaarXiv
dc.rightsacceso abierto
dc.subjectGalaxies: active
dc.subjectGalaxies: high-redshif
dc.subjectGalaxies: jets
dc.subjectQuasars: supermassive black holes
dc.subject.ddc520
dc.titleDiscovery and characterization of 25 new quasars at 4.6 < z < 6.9 from wide-field multiband surveys
dc.typepreprint
sipa.codpersvinculados1183132
sipa.trazabilidadORCID;2026-01-12
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