Zobrazeno 1 - 10
of 636
pro vyhledávání: '"FREY, S. P."'
To investigate the radio properties of the recently found high-redshift population, we collected a sample of $919$ little red dots (LRDs) from the literature. By cross-matching their coordinates with the radio catalogues based on the first- and secon
Externí odkaz:
http://arxiv.org/abs/2411.19518
Autor:
Frey, S., Zhang, Y., Perger, K., An, T., Gabányi, K. É., Gurvits, L. I., Hwang, C. -Y., Koptelova, E., Paragi, Z., Fogasy, J.
Publikováno v:
Astronomy and Astrophysics, Vol. 681, L12 (2024)
The existence of accreting supermassive black holes up to billions of solar masses at early cosmological epochs (in the context of this work, redshifts z>=6) requires very fast growth rates which is challenging to explain. The presence of a relativis
Externí odkaz:
http://arxiv.org/abs/2312.15765
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 526, Issue 3, pp. 4698-4709 (December 2023)
In a previous work, we have identified the spin of the dominant black hole of a binary from its jet properties. Analysing Very Long Baseline Array (VLBA) observations of the quasar S5~1928+738, taken at $15$-GHz during $43$ epochs between $1995.96$ a
Externí odkaz:
http://arxiv.org/abs/2308.00153
Autor:
Benke, P., Gabányi, K. É., Frey, S., An, T., Gurvits, L. I., Kun, E., Mohan, P., Paragi, Z., Ros, E.
Publikováno v:
A&A 677, A1 (2023)
PSO J334.2028+1.4075 (PSO J334) is a luminous quasar located at redshift z=2.06. The source gained attention when periodic flux density variations were discovered in its optical light curve. These variations were initially interpreted as the variabil
Externí odkaz:
http://arxiv.org/abs/2306.17632
Publikováno v:
Proceedings of Science, Vol. 428, id. PoS(EVN2022)006 (2023)
X-ray binaries are known to show state transitions related to accretion rate changes which are often accompanied with dramatic changes in the jet emission. However, it is not clear whether this characteristics of stellar-mass black hole systems can b
Externí odkaz:
http://arxiv.org/abs/2304.10125
Autor:
Frey, S., An, T., Gabányi, K., Gurvits, L., Krezinger, M., Melnikov, A., Mohan, P., Paragi, Z., Perger, K., Shu, F., Titov, O., de Vicente, P., Zhang, Y.
Publikováno v:
Proceedings of Science, Vol. 428, id. PoS(EVN2022)022 (2023)
The powerful high-redshift quasar J2102+6015 (at z=4.575) may provide useful information for studying supermassive black hole growth, galaxy evolution and feedback in the early Universe. The source has so far been imaged with very long baseline inter
Externí odkaz:
http://arxiv.org/abs/2301.07355
Autor:
Gabányi, K. É., Belladitta, S., Frey, S., Orosz, G., Gurvits, L. I., Rozgonyi, K., An, T., Cao, H., Paragi, Z., Perger, K.
Publikováno v:
Publications of the Astronomical Society of Australia, Vol. 40, id. E004 (2023)
Active galactic nuclei (AGN) have been observed as far as redshift z~7. They are crucial in investigating the early Universe as well as the growth of supermassive black holes at their centres. Radio-loud AGN with their jets seen at a small viewing an
Externí odkaz:
http://arxiv.org/abs/2301.04533
Autor:
Agudo, I., Amati, L., An, T., Bauer, F. E., Benetti, S., Bernardini, M. G., Beswick, R., Bhirombhakdi, K., de Boer, T., Branchesi, M., Brennan, S. J., Caballero-García, M. D., Cappellaro, E., Rodríguez, N. Castro, Castro-Tirado, A. J., Chambers, K. C., Chassande-Mottin, E., Chaty, S., Chen, T. -W., Coleiro, A., Covino, S., D'Ammando, F., D'Avanzo, P., D'Elia, V., Fiore, A., Flörs, A., Fraser, M., Frey, S., Frohmaier, C., Galbany, L., Gall, C., Gao, H., García-Rojas, J., Ghirlanda, G., Giarratana, S., Gillanders, J. H., Giroletti, M., Gompertz, B. P., Gromadzki, M., Heintz, K. E., Hu, Y. -D., Huber, M. E., Inkenhaag, A., Izzo, L., Jin, Z. P., Jonker, P. G., Kann, D. A., Kool, E. C., Kotak, R., Leloudas, G., Levan, A. J., Lin, C. -C., Lyman, J. D., Magnier, E. A., Maguire, K., Mandel, I., Marcote, B., Sánchez, D. Mata, Mattila, S., Melandri, A., Michałowski, M. J., Moldon, J., Nicholl, M., Guelbenzu, A. Nicuesa, Oates, S. R., Onori, F., Orienti, M., Paladino, R., Paragi, Z., Perez-Torres, M., Pian, E., Pignata, G., Piranomonte, S., Quirola-Vásquez, J., Ragosta, F., Rau, A., Ronchini, S., Rossi, A., Sánchez-Ramírez, R., Salafia, O. S., Schulze, S., Smartt, S. J., Smith, K. W., Sollerman, J., Srivastav, S., Starling, R. L. C., Steeghs, D., Stevance, H. F., Testa, V., Torres, M. A. P., Vergani, S. D., Vescovi, D., Wainscost, R., Watson, D., Wiersema, K., Wyrzykowski, Ł., Yang, J., Yang, S., Young, D. R.
Publikováno v:
A&A 675, A201 (2023)
We present the results from multi-wavelength observations of a transient discovered during the follow-up of S191213g, a gravitational wave (GW) event reported by the LIGO-Virgo Collaboration as a possible binary neutron star merger in a low latency s
Externí odkaz:
http://arxiv.org/abs/2208.09000
Autor:
Zhang, Y., An, T., Wang, A., Frey, S., Gurvits, L. I., Gabanyi, K. E., Perger, K., Paragi, Z.
Publikováno v:
A&A 662, L2 (2022)
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 of high-redshift AGNs enabled by very long baseline interferometry (V
Externí odkaz:
http://arxiv.org/abs/2205.05859
Autor:
Krezinger, M., Perger, K., Gabányi, K. É., Frey, S., Gurvits, L. I, Paragi, Zs., An, T., Zhang, Y., Cao, H., Sbarrato, T.
High-redshift radio sources provide plentiful opportunities for studying the formation and evolution of early galaxies and supermassive black holes. However, the number of known radio-loud active galactic nuclei (AGN) above redshift 4 is rather limit
Externí odkaz:
http://arxiv.org/abs/2204.02114