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http://hdl.handle.net/20.500.12386/31049
Titolo: | Radio detection of VIK J2318−3113, the most distant radio-loud quasar (z = 6.44) | Autori: | Ighina, L. Belladitta, S. CACCIANIGA, Alessandro Broderick, J. W. Drouart, G. MORETTI, Alberto Seymour, N. |
Data pubblicazione: | 2021 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 647 | Da pagina:: | L11 | Abstract: | We report the 888 MHz radio detection in the Rapid ASKAP Continuum Survey (RACS) of VIK J2318−3113, a z = 6.44 quasar. Its radio luminosity (1.2 × 10^26 W Hz^−1 at 5 GHz) compared to the optical luminosity (1.8 × 10^24 W Hz^−1 at 4400 Å) makes it the most distant radio-loud quasar observed so far, with a radio loudness R ∼ 70 (R = L_5 GHz/L4400 Å). Moreover, the high bolometric luminosity of the source (L_bol = 7.4 × 10^46 erg s^−1) suggests the presence of a supermassive black hole with a high mass (≳6 × 10^8 M⊙) at a time when the Universe was younger than a billion years. Combining the new radio data from RACS with previous ASKAP observations at the same frequency, we found that the flux density of the source may have varied by a factor of ∼2, which could suggest the presence of a relativistic jet oriented towards the line of sight, that is, a blazar nature. However, currently available radio data do not allow us to firmly characterise the orientation of the source. Further radio and X-ray observations are needed. | URI: | http://hdl.handle.net/20.500.12386/31049 | URL: | https://www.aanda.org/articles/aa/full_html/2021/03/aa40362-21/aa40362-21.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/202140362 | Bibcode ADS: | 2021A&A...647L..11I | Fulltext: | open |
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