High-resolution imaging of two radio quasars at the end of the reionization epoch

Krisztina Perger; Yingkang Zhang; Sándor Frey; Tao An; Krisztina E. Gabányi; Leonid I. Gurvits; Chorng Yuan Hwang; Ekaterina Koptelova; Zsolt Paragi; Ailing Wang

doi:10.22323/1.428.0024

High-resolution imaging of two radio quasars at the end of the reionization epoch

Krisztina Perger, Yingkang Zhang, Sándor Frey, Tao An, Krisztina E. Gabányi, Leonid I. Gurvits, Chorng Yuan Hwang, Ekaterina Koptelova, Zsolt Paragi, Ailing Wang

Astrodynamics & Space Missions

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Abstract

There are approximately 250 quasars discovered at redshift z ≥ 6, of which only a handful were detected in radio bands, and even fewer were imaged with the highest resolution very long baseline interferometry (VLBI) technique. Here we report the results of our dual-frequency observations with the Very Long Baseline Array (VLBA) of two such recently discovered quasars, VIKING J231818.35-311346.3 at z = 6.44 and FIRST J233153.20+112952.11 at z = 6.57. Both extremely distant sources were imaged with VLBI for the first time. The radio properties of the former are consistent with those of quasars with young radio jets. The latter has an UV/optical spectrum characteristic of BL Lac objects, of which no others have been found beyond redshift 4 so far. Our VLBA observations revealed a flat-spectrum compact radio source.

Original language	English
Article number	024
Number of pages	5
Journal	Proceedings of Science
Volume	428
DOIs	https://doi.org/10.22323/1.428.0024
Publication status	Published - 2023
Event	15th European VLBI Network Mini-Symposium and Users' Meeting, EVN 2022 - Cork, Ireland Duration: 11 Jul 2022 → 15 Jul 2022

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10.22323/1.428.0024

EVN2022_024Final published version, 568 KBLicence: CC BY-NC-ND

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title = "High-resolution imaging of two radio quasars at the end of the reionization epoch",

abstract = "There are approximately 250 quasars discovered at redshift z ≥ 6, of which only a handful were detected in radio bands, and even fewer were imaged with the highest resolution very long baseline interferometry (VLBI) technique. Here we report the results of our dual-frequency observations with the Very Long Baseline Array (VLBA) of two such recently discovered quasars, VIKING J231818.35-311346.3 at z = 6.44 and FIRST J233153.20+112952.11 at z = 6.57. Both extremely distant sources were imaged with VLBI for the first time. The radio properties of the former are consistent with those of quasars with young radio jets. The latter has an UV/optical spectrum characteristic of BL Lac objects, of which no others have been found beyond redshift 4 so far. Our VLBA observations revealed a flat-spectrum compact radio source.",

author = "Krisztina Perger and Yingkang Zhang and S{\'a}ndor Frey and Tao An and Gab{\'a}nyi, {Krisztina E.} and Gurvits, {Leonid I.} and Hwang, {Chorng Yuan} and Ekaterina Koptelova and Zsolt Paragi and Ailing Wang",

year = "2023",

doi = "10.22323/1.428.0024",

language = "English",

volume = "428",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Scuola Internazionale Superiore di Studi Avanzati (SISSA)",

note = "15th European VLBI Network Mini-Symposium and Users' Meeting, EVN 2022 ; Conference date: 11-07-2022 Through 15-07-2022",

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TY - JOUR

T1 - High-resolution imaging of two radio quasars at the end of the reionization epoch

AU - Perger, Krisztina

AU - Zhang, Yingkang

AU - Frey, Sándor

AU - An, Tao

AU - Gabányi, Krisztina E.

AU - Gurvits, Leonid I.

AU - Hwang, Chorng Yuan

AU - Koptelova, Ekaterina

AU - Paragi, Zsolt

AU - Wang, Ailing

PY - 2023

Y1 - 2023

N2 - There are approximately 250 quasars discovered at redshift z ≥ 6, of which only a handful were detected in radio bands, and even fewer were imaged with the highest resolution very long baseline interferometry (VLBI) technique. Here we report the results of our dual-frequency observations with the Very Long Baseline Array (VLBA) of two such recently discovered quasars, VIKING J231818.35-311346.3 at z = 6.44 and FIRST J233153.20+112952.11 at z = 6.57. Both extremely distant sources were imaged with VLBI for the first time. The radio properties of the former are consistent with those of quasars with young radio jets. The latter has an UV/optical spectrum characteristic of BL Lac objects, of which no others have been found beyond redshift 4 so far. Our VLBA observations revealed a flat-spectrum compact radio source.

AB - There are approximately 250 quasars discovered at redshift z ≥ 6, of which only a handful were detected in radio bands, and even fewer were imaged with the highest resolution very long baseline interferometry (VLBI) technique. Here we report the results of our dual-frequency observations with the Very Long Baseline Array (VLBA) of two such recently discovered quasars, VIKING J231818.35-311346.3 at z = 6.44 and FIRST J233153.20+112952.11 at z = 6.57. Both extremely distant sources were imaged with VLBI for the first time. The radio properties of the former are consistent with those of quasars with young radio jets. The latter has an UV/optical spectrum characteristic of BL Lac objects, of which no others have been found beyond redshift 4 so far. Our VLBA observations revealed a flat-spectrum compact radio source.

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U2 - 10.22323/1.428.0024

DO - 10.22323/1.428.0024

M3 - Conference article

AN - SCOPUS:85150160922

SN - 1824-8039

VL - 428

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 024

T2 - 15th European VLBI Network Mini-Symposium and Users' Meeting, EVN 2022

Y2 - 11 July 2022 through 15 July 2022

ER -

High-resolution imaging of two radio quasars at the end of the reionization epoch

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