395 citations · 2.4k across the 119 of their papers we have counts for
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J2102+6015: a potential distant multimessenger?
Leonid I. Gurvits, Sándor Frey, Máté Krezinger +7
We present and briefly discuss results of several studies of the source J2102+6015 with tentatively defined redshift z=4:575 which demonstrates unusual properties in imaging and as…
VLBI observations of VIK J2318-3113, a quasar at z = 6.44
Y. Zhang, T. An, A. Wang +5
The nature of jets in active galactic nuclei (AGN) in the early Universe and their feedback to the host galaxy remain a highly topical question. Observations of the radio structure…
The radio structure of 3C 316, a galaxy with double-peaked narrow optical emission lines
T. An, Z. Paragi, S. Frey +6
The galaxy 3C\,316 is the brightest in the radio band among the optically-selected candidates exhibiting double-peaked narrow optical emission lines. Observations with the Very Lar…
Optical-radio positional offsets for active galactic nuclei
G. Orosz, S. Frey
Context. It will soon become possible to directly link the most accurate radio reference frame with the Gaia optical reference frame using many common extragalactic objects. It is…
A compact radio source in the high-redshift soft gamma-ray blazar IGR J12319-0749
S. Frey, Z. Paragi, K. E. Gabanyi +1
Context. Blazars are powerful active galactic nuclei (AGNs) radiating prominently in the whole electromagnetic spectrum, from the radio to the X-ray and gamma-ray bands. Their emis…
On the Doppler boosting in the compact radio jet of the distant blazar J1026+2542 at z=5.3
S. Frey, J. O. Fogasy, Z. Paragi +1
Based on its broad-band spectral energy distribution, and the X-ray spectrum in particular, the radio-loud active galactic nucleus (AGN) SDSS J102623.61+254259.5 (J1026+2542) has r…
Kinematics of the Compact Symmetric Object OQ 208 revisited
Fang Wu, Tao An, Willem A. Baan +6
Aims. A long timeline kinematic study of the archetypal CSO OQ 208 sheds light on the physical properties of the most compact radio sources. Methods. Archival data from the VLBA at…
Redshift, Time, Spectrum - the most distant radio quasars with VLBI
S. Frey, L. I. Gurvits, Z. Paragi +1
The highest-redshift quasars are still rare and valuable objects for observational astrophysics and cosmology. They provide important constraints on the growth of the earliest supe…
Two in one? A possible dual radio-emitting nucleus in the quasar SDSS J1425+3231
S. Frey, Z. Paragi, T. An +1
The radio-emitting quasar SDSS J1425+3231 (z=0.478) was recently found to have double-peaked narrow [O III] optical emission lines. Based on the analysis of the optical spectrum, P…
Radio-optical outlier quasars - a case study with ICRF2 and SDSS
G. Orosz, S. Frey
With Gaia, it will become possible to directly link the radio and optical reference frames using a large number of common objects. For the most accurate radio-optical link, it is i…
WMAP extragalactic point sources as potential Space VLBI calibrators
K. Gereb, S. Frey
The point source list of the Wilkinson Microwave Anisotropy Probe (WMAP) is a uniform, all-sky catalogue of bright sources with flux density measurements at high (up to 94 GHz) rad…
Radio interferometric observations of two core-dominated triple radio sources at z>3
D. Cseh, S. Frey, Z. Paragi +2
Aims. We selected two radio quasars (J1036+1326 and J1353+5725) based on their 1.4-GHz radio structure, which is dominated by a bright central core and a pair of weaker and nearly…
Physical parameters of a relativistic jet at very high redshift: the case of the blazar J1430+4204
Péter Veres, Sándor Frey, Zsolt Paragi +1
Context. The high-redshift (z = 4.72) blazar J1430+4204 produced a major radio outburst in 2005. Such outbursts are usually associated with the emergence of a new component in the…
The compact radio structure of the high-redshift blazar J1430+4204 before and after a major outburst
Péter Veres, Sándor Frey, Zsolt Paragi +1
The high-redshift (z=4.72) blazar J1430+4204 produced an exceptional radio outburst in 2006. We analyzed 15-GHz radio interferometric images obtained with the Very Long Baseline Ar…
A suspected Dark Lens revealed with the e-EVN
Z. Paragi, S. Frey, B. Campbell +1
The e-VLBI technique offers a unique opportunity for users to probe the milliarcsecond (mas) scale structure of unidentified radio sources, and organise quick follow-up observation…