134 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Joint Institute for VLBI ERICNL14 papers
- Hungarian Academy of SciencesHU8 papers
- Max Planck Institute for Radio AstronomyDE7 papers
- Konkoly ObservatoryHU6 papers
- Shanghai Astronomical ObservatoryCN6 papers
- Chinese Academy of SciencesCN5 papers
- HUN-REN Research Centre for Astronomy and Earth SciencesHU5 papers
- Institute of Space and Astronautical ScienceJP4 papers
- Leiden Observatory4 papers
- Eötvös Loránd UniversityHU3 papers
- Istituto di Radioastronomia di BolognaIT3 papers
- Japan Aerospace Exploration AgencyJP3 papers
24 papers
A plug-and-play solution for characterizing two-way optical frequency transfer over free-space
Jingxian Ji, Shambo Mukherjee, Alexander Kuhl +5
Optical clock networks connected by phase-coherent links offer significant potential for advancing fundamental research and diverse scientific applications. Free-space optical freq…
Quantifying Barriers of Urban Mobility
Gergő Pintér, Balázs Lengyel
Barriers in cities, such as administrative boundaries, natural obstacles, railways or major roads are thought to induce segregation. However, the empirical knowledge about this phe…
Open our eyes to wider fields in VLBI surveys
Kristóf Rozgonyi, Sándor Frey
The observation and imaging of hundreds or thousands of radio sources with the technique of very long baseline interferometry (VLBI) is a computationally intensive task. However, t…
Four dual AGN candidates observed with the VLBA
K. É. Gabányi, T. An, S. Frey +4
According to hierarchical structure formation models, merging galaxies are expected to be seen in different stages of their coalescence. However, currently there are no straightfor…
What are the megahertz peaked-spectrum sources?
Rocco Coppejans, David Cseh, Sjoert van Velzen +8
Megahertz peaked-spectrum (MPS) sources have spectra that peak at frequencies below 1 GHz in the observer's frame and are believed to be radio-loud active galactic nuclei (AGN). We…
Radio Properties of the -ray Emitting CSO Candidate 2234+282
T. An, Y. -Z. Cui, K. E. Gabanyi +3
Most of the gamma-ray emitting active galactic nuclei (AGN) are blazars, although there is still a small fraction of non-blazar AGN in the Fermi/LAT catalog. Among these misaligned…
Four hot DOGs in the microwave
S. Frey, Z. Paragi, K. É. Gabányi +1
Hot dust-obscured galaxies (hot DOGs) are a rare class of hyperluminous infrared galaxies identified with the Wide-field Infrared Survey Explorer (WISE) satellite. The majority of…
Constraining the parameters of the putative supermassive binary black hole in PG 1302-102 from its radio structure
E. Kun, S. Frey, K. É. Gabányi +3
We investigate the pc-scale kinematics and kpc-scale radio morphology of the quasar PG 1302-102, which may harbour a sub-pc separation supermassive binary black hole system at its…
A close-pair binary in a distant triple supermassive black-hole system
R. P. Deane, Z. Paragi, M. J. Jarvis +8
Galaxies are believed to evolve through merging, which should lead to multiple supermassive black holes in some. There are four known triple black hole systems, with the closest pa…
Unveiling recurrent jets of the ULX Holmberg II X-1: evidence for a massive stellar-mass black hole?
D. Cseh, P. Kaaret, S. Corbel +10
We report on the discovery of an apparent triple radio structure hidden inside the radio bubble of the ultraluminous X-ray source Holmberg II X-1. The morphology is consistent with…
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…
Possible Detection of Apparent Superluminal inward motion in Markarian 421 after the Giant X-ray flare in February, 2010
K. Niinuma, M. Kino, H. Nagai +7
We report on the VLBI follow-up observations using the Japanese VLBI Network (JVN) array at 22 GHz for the largest X-ray flare of TeV blazar Mrk 421 that occurred in mid-February,…
On the connection of the apparent proper motion and the VLBI structure of compact radio sources
A. Moór, S. Frey, S. B. Lambert +2
Many of the compact extragalactic radio sources that are used as fiducial points to define the celestial reference frame are known to have proper motions detectable with long-term…
Global e-VLBI observations of the gamma-ray narrow line Seyfert 1 PMN J0948+0022
M. Giroletti, Z. Paragi, H. Bignall +16
There is growing evidence of relativistic jets in radio-loud narrow-line Seyfert 1 (RL-NLS1) galaxies. We constrain the observational properties of the radio emission in the first…
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…
Identification of Potential Weak Target Radio Quasars for ASTRO-G In-Beam Phase-Referencing
S. Frey, K. E. Gabanyi, Y. Asaki
We apply an efficient selection method to identify potential weak Very Long Baseline Interferometry (VLBI) target quasars simply using optical (SDSS) and low-resolution radio (FIRS…
Multi-frequency investigation of the parsec- and kilo-parsec-scale radio structures in high-redshift quasar PKS 1402+044
J. Yang, L. I. Gurvits, A. P. Lobanov +2
We investigate the frequency-dependent radio properties of the jet of the luminous high-redshift (z = 3.2) radio quasar PKS 1402+044 (J1405+0415) by means of radio interferometric…
VSOP monitoring of the compact BL Lac object AO 0235+164
S. Frey, L. I. Gurvits, D. C. Gabuzda +7
In 1999, the highly compact and variable BL Lac object AO 0235+164 was identified as the highest brightness temperature active galactic nucleus observed with the VLBI Space Observa…
Radio structure of the most distant radio-detected quasar at the ten milli- arcsecond scale
S. Frey, L. Mosoni, Z. Paragi +1
We present a high resolution radio image of SDSS 0836+0054 identified recently as the most distant radio-detected quasar at a redshift of z=5.82. The observation was carried out wi…
The compact core-jet region of the superluminal quasar 3C216
Z. Paragi, S. Frey, I. Fejes +3
Space very long baseline interferometry (VLBI) observations of the quasar 3C216 with the VLBI Space Observatory Programme (VSOP) reveal that the parsec scale structure of the sourc…
VSOP observation of the quasar PKS 2215+020: a new laboratory for core-jet physics at z=3.572
A. P. Lobanov, L. I. Gurvits, S. Frey +4
We report results of a VSOP (VLBI Space Observatory Programme) observation of a high redshift quasar PKS 2215+020 (z=3.572). The ~1 milliarcsecond resolution image of the quasar re…
Dual-Frequency VSOP Observations of AO 0235+164
S. Frey, L. I. Gurvits, D. R. Altschuler +6
AO 0235+164 is a very compact, flat spectrum radio source identified as a BL Lac object at a redshift of z=0.94. It is one of the most violently variable extragalactic objects at b…
The inner radio jet region and the complex environment of SS433
Z. Paragi, R. C. Vermeulen, I. Fejes +3
We present multi-frequency VLBA+VLA observations of SS433 at 1.6, 5 and 15 GHz. These observations provide the highest angular resolution radio spectral index maps ever made for th…
The ``angular size - redshift'' relation for compact radio structures in quasars and radio galaxies
L. I. Gurvits, K. I. Kellermann, S. Frey
We discuss the ``angular size - redshift'' relation for compact radio sources distributed over a wide range of redshifts 0.01 < z < 4.73. Our study is based on a sample of 330 5 GH…