A small radio galaxy at z = 4.026

Krisztina Gabányi*, Sándor Frey, Tao An, Hongmin Cao, Zsolt Paragi, Leonid I. Gurvits, Yingkang Zhang, Tullia Sbarrato, Máté Krezinger, More Authors

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review


Less than 200 radio-loud active galactic nuclei are known above redshift 4. Around 40 of them have been observed at milliarcsecond (mas) scale resolution with very long baseline interferometry (VLBI) technique. Some of them are unresolved, compact, relativistically beamed objects, and blazars with jets pointing at small angles to the observer's line of sight. But there are also objects with no sign of relativistic beaming possibly having larger jet inclination angles. In a couple of cases, X-ray observations indicate the presence of relativistic beaming contrary to the VLBI measurements made with the European VLBI Network. J1420+1205 is a prominent example, where our 30–100 mas-scale enhanced multi element remotely linked interferometer network radio observations revealed a rich structure reminiscent of a small radio galaxy. It shows a bright hotspot that might be related to the denser interstellar medium around a young galaxy at an early cosmological epoch.

Original languageEnglish
Pages (from-to)1-5
Number of pages5
JournalAstronomische Nachrichten
Publication statusPublished - 2021


  • galaxies: active
  • galaxies: high-redshift
  • galaxies: individual: J1420+1205
  • radio continuum: galaxies


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