Discovery and characterization of 25 new quasars at 4.6 < z < 6.9 from wide-field multiband surveys
Luminous quasars at z>4 provide key insights into the early Universe. Their rarity necessitates wide-field multiband surveys to efficiently separate them from the main astrophysical contaminants (i.e., ultracool dwarfs). To expand the sample of high-z quasars, we conducted targeted selections usi...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
23 July 2025
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| In: |
Astronomy and astrophysics
Year: 2025, Jahrgang: 699, Pages: 1-23 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/202554859 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/202554859 Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2025/07/aa54859-25/aa54859-25.html 
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| Verfasserangaben: | Silvia Belladitta, Eduardo Bañados, Zhang-Liang Xie, Roberto Decarli, Silvia Onorato, Jinyi Yang, Manuela Bischetti, Masafusa Onoue, Federica Loiacono, Laura N. Martínez-Ramírez, Chiara Mazzucchelli, Frederick B. Davies, Julien Wolf, Jan-Torge Schindler, Xiaohui Fan, Feige Wang, Fabian Walter, Tatevik Mkrtchyan, Daniel Stern, Emanuele P. Farina, and Bram P. Venemans |
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| 245 | 1 | 0 | |a Discovery and characterization of 25 new quasars at 4.6 < z < 6.9 from wide-field multiband surveys |c Silvia Belladitta, Eduardo Bañados, Zhang-Liang Xie, Roberto Decarli, Silvia Onorato, Jinyi Yang, Manuela Bischetti, Masafusa Onoue, Federica Loiacono, Laura N. Martínez-Ramírez, Chiara Mazzucchelli, Frederick B. Davies, Julien Wolf, Jan-Torge Schindler, Xiaohui Fan, Feige Wang, Fabian Walter, Tatevik Mkrtchyan, Daniel Stern, Emanuele P. Farina, and Bram P. Venemans |
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| 520 | |a Luminous quasars at z>4 provide key insights into the early Universe. Their rarity necessitates wide-field multiband surveys to efficiently separate them from the main astrophysical contaminants (i.e., ultracool dwarfs). To expand the sample of high-z quasars, we conducted targeted selections using optical, infrared, and radio surveys, which we complemented by literature-based quasar candidate catalogs. We report the discovery of 25 new quasars at 4.6<z<6.9 (six at z≥6.5), with M1450 between −25.4 and −27.0. We also present new spectra of six z>6.5 quasars we selected, but whose independent discovery has already been published in the literature. Three of the newly discovered quasars are strong radio emitters (L1.4 GHz = 0.09−1.0×10 34 erg s −1 Hz−1). One source at z = 4.71 exhibits typical blazar-like properties, including a flat radio spectrum, a radio loudness of ∼1000, and multifrequency variability. It was also detected by SRG/eROSITA X-ray telescope (f 0.2−2.3 keV∼1.3×10 −13 erg s −1< cm −2). In addition, for seven 6.3<z<6.9 quasars, we present near-infrared spectroscopy and estimated the central black hole mass from their C IV and Mg II broad emission lines. Their masses (log[M BH,MgII] = 8.58−9.14 M⊙) and Eddington ratios (λ Edd,MgII = 0.74−2.2) are consistent with other z>6 quasars reported in the literature. A z = 6.3 quasar exhibits a velocity difference of approximately 9000 km s −1 between the C IV and Mg II emission lines. This means that it is one of the most extreme C IV outflows currently known. The sample also includes three high-ionization broad absorption line (HiBAL) quasars. One of these quasars shows potential evidence of an extremely fast outflow feature that reaches 47 000 km s -1. | ||
| 700 | 1 | |a Bañados Torres, Eduardo |e VerfasserIn |0 (DE-588)1073988821 |0 (DE-627)830105220 |0 (DE-576)435497049 |4 aut | |
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| 700 | 1 | |a Decarli, Roberto |e VerfasserIn |4 aut | |
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| 700 | 1 | |a Yang, Jinyi |e VerfasserIn |4 aut | |
| 700 | 1 | |a Bischetti, Manuela |e VerfasserIn |4 aut | |
| 700 | 1 | |a Onoue, Masafusa |e VerfasserIn |4 aut | |
| 700 | 1 | |a Loiacono, Federica |e VerfasserIn |4 aut | |
| 700 | 1 | |a Martínez-Ramírez, Laura N. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Mazzucchelli, Chiara |e VerfasserIn |4 aut | |
| 700 | 1 | |a Davies, Frederick B. |e VerfasserIn |0 (DE-588)1192316126 |0 (DE-627)1670632318 |4 aut | |
| 700 | 1 | |a Wolf, Julien |d 1991- |e VerfasserIn |0 (DE-588)1292120762 |0 (DE-627)1847490174 |4 aut | |
| 700 | 1 | |a Schindler, Jan-Torge |e VerfasserIn |4 aut | |
| 700 | 1 | |a Fan, Xiaohui |e VerfasserIn |4 aut | |
| 700 | 1 | |a Wang, Feige |e VerfasserIn |4 aut | |
| 700 | 1 | |a Walter, Fabian |d 1971- |e VerfasserIn |0 (DE-588)121386732 |0 (DE-627)705426777 |0 (DE-576)292683359 |4 aut | |
| 700 | 1 | |a Mkrtchyan, Tatevik |e VerfasserIn |4 aut | |
| 700 | 1 | |a Stern, Daniel |e VerfasserIn |4 aut | |
| 700 | 1 | |a Farina, Emanuele P. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Venemans, Bram P. |e VerfasserIn |4 aut | |
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