The Event Horizon Telescope Image of the Quasar NRAO 530

Medientyp: E-Artikel
Titel: The Event Horizon Telescope Image of the Quasar NRAO 530
Beteiligte: Jorstad, Svetlana; Wielgus, Maciek; Lico, Rocco; Issaoun, Sara; Broderick, Avery E.; Pesce, Dominic W.; Liu 刘, Jun 俊; Zhao, Guang-Yao; Krichbaum, Thomas P.; Blackburn, Lindy; Chan, Chi-kwan; Janssen, Michael; Ramakrishnan, Venkatessh; Akiyama, Kazunori; Alberdi, Antxon; Algaba, Juan Carlos; Bouman, Katherine L.; Cho, Ilje; Fuentes, Antonio; Gómez, José L.; Gurwell, Mark; Johnson, Michael D.; Kim, Jae-Young; Lu 路, Ru-Sen 如森; [...]
Erschienen: American Astronomical Society, 2023
Erschienen in: The Astrophysical Journal
Sprache: Nicht zu entscheiden
DOI: 10.3847/1538-4357/acaea8
ISSN: 1538-4357; 0004-637X
Schlagwörter: Space and Planetary Science ; Astronomy and Astrophysics
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Beschreibung: <jats:title>Abstract</jats:title> <jats:p>We report on the observations of the quasar NRAO 530 with the Event Horizon Telescope (EHT) on 2017 April 5−7, when NRAO 530 was used as a calibrator for the EHT observations of Sagittarius A*. At <jats:italic>z</jats:italic> = 0.902, this is the most distant object imaged by the EHT so far. We reconstruct the first images of the source at 230 GHz, at an unprecedented angular resolution of ∼20 <jats:italic>μ</jats:italic>as, both in total intensity and in linear polarization (LP). We do not detect source variability, allowing us to represent the whole data set with static images. The images reveal a bright feature located on the southern end of the jet, which we associate with the core. The feature is linearly polarized, with a fractional polarization of ∼5%–8%, and it has a substructure consisting of two components. Their observed brightness temperature suggests that the energy density of the jet is dominated by the magnetic field. The jet extends over 60 <jats:italic>μ</jats:italic>as along a position angle ∼ −28°. It includes two features with orthogonal directions of polarization (electric vector position angle), parallel and perpendicular to the jet axis, consistent with a helical structure of the magnetic field in the jet. The outermost feature has a particularly high degree of LP, suggestive of a nearly uniform magnetic field. Future EHT observations will probe the variability of the jet structure on microarcsecond scales, while simultaneous multiwavelength monitoring will provide insight into the high-energy emission origin.</jats:p>
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