395 citations · 2.4k across the 119 of their papers we have counts for
9 papers · 2 filters
High-Resolution Radio Image of a Candidate Radio Galaxy at z=5.72
K. É. Gabányi, S. Frey, L. I. Gurvits +2
Recently, Saxena et al. (2018) reported the discovery of a possible radio galaxy, J15301049 at a redshift of z=5.72. We observed the source with the European Very Long Baseline…
The loud and the quiet: searching for radio counterparts of two radio-weak BL Lac candidates with VLBI
Hong-Min Cao, Sándor Frey, Krisztina É. Gabányi +4
BL Lac objects are known to have compact jets inclined to our line of sight at a small angle, showing prominent radio emission. Two radio-weak BL Lac candidates with no counterpart…
VLBI studies of DAGN and SMBHB hosting galaxies
Tao An, P. Mohan, Sandor Frey
Dual active galactic nuclei (DAGN) and supermassive black hole binaries (SMBHBs) at kpc and pc-scale separations, respectively, are expected during stages of galaxy merger and evol…
Mid-infrared variability of the neutrino source blazar TXS 0506056
K. É. Gabányi, A. Moór, S. Frey
The IceCube instrument detected a high-energy cosmic neutrino event on 2017 September 22 (IceCube_170922A, IceCube Collaboration 2018), which the electromagnetic follow-up campaign…
High-resolution radio imaging of two luminous quasars beyond redshift 4.5
S. Frey, O. Titov, A. E. Melnikov +2
Context. Radio-loud active galactic nuclei in the early Universe are rare. The quasars J0906+6930 at redshift z=5.47 and J2102+6015 at z=4.57 stand out from the known sample with t…
Infrared variability of radio-loud narrow-line Seyfert 1 galaxies
K. É. Gabányi, A. Moór, S. Frey
Most of the radio-loud narrow-line Seyfert 1 (NLS1) galaxies resemble compact steep-spectrum sources. However, the extremely radio-loud ones show blazar-like characteristics, like…
Constraining the radio jet proper motion of the high-redshift quasar J2134-0419 at z=4.3
K. Perger, S. Frey, K. É. Gabányi +12
To date, PMN J2134-0419 (at a redshift z=4.33) is the second most distant quasar known with a milliarcsecond-scale morphology permitting direct estimates of the jet proper motion.…
A Single Radio Source in the High-redshift Dual AGN LBQS 0302-0019
S. Frey, K. É. Gabányi
By discovering a narrow-line emitter embedded in an extended Ly-alpha nebula, Husemann et al. (2018) found that the luminous radio-quiet quasar LBQS 0302-0019 is a dual active gala…
Is 4C+29.48 a gamma-ray source?
K. É. Gabányi, S. Frey, T. An
The Fermi Large Area Telescope revealed that the extragalactic gamma-ray sky is dominated by blazars, active galactic nuclei (AGN) whose jet is seen at very small angle to the line…