Zobrazeno 1 - 10
of 128
pro vyhledávání: '"Frezzato, M."'
Autor:
Vietri, A., Berton, M., Ciroi, S., Congiu, E., La Mura, G., Cracco, V., Frezzato, M., Chen, S., Cattapan, A., Peruzzi, T., Rafanelli, P.
Narrow-line Seyfert 1 galaxies (NLS1s) are a subclass of active galactic nuclei (AGN). It is often believed that these AGN have small black hole mass, which is responsible for the narrowness of the permitted lines. They are also characterised by a hi
Externí odkaz:
http://arxiv.org/abs/1809.09901
Autor:
Berton, M., Congiu, E., Ciroi, S., Komossa, S., Frezzato, M., Di Mille, F., Antón, S., Antonucci, R., Caccianiga, A., Coppi, P., Järvelä, E., Kotilainen, J., Lähteenmäki, A., Mathur, S., Chen, S., Cracco, V., La Mura, G., Rafanelli, P.
Narrow-line Seyfert 1 galaxies (NLS1s) are a class of active galactic nuclei (AGN) which are known to be one of the few sources of $\gamma$ rays, which originate in a relativistic beamed jet. Becuase of their relatively large distance, a poorly inves
Externí odkaz:
http://arxiv.org/abs/1807.08953
Autor:
Berton, M., Congiu, E., Järvelä, E., Antonucci, R., Kharb, P., Lister, M. L., Tarchi, A., Caccianiga, A., Chen, S., Foschini, L., Lähteenmäki, A., Richards, J. L., Ciroi, S., Cracco, V., Frezzato, M., La Mura, G., Rafanelli, P.
Publikováno v:
A&A 614, A87 (2018)
We report the first results of a survey on 74 narrow-line Seyfert 1 galaxies (NLS1s) carried out in 2015 with the Karl G. Jansky Very Large Array (JVLA) at 5 GHz in A-configuration. So far, this is the largest survey aimed to image the radio continuu
Externí odkaz:
http://arxiv.org/abs/1801.03519
Autor:
Berton, M., Liao, N. H., La Mura, G., Järvelä, E., Congiu, E., Foschini, L., Frezzato, M., Ramakrishnan, V., Fan, X. L., Lähteenmäki, A., Pursimo, T., Abate, V., Bai, J. M., Calcidese, P., Ciroi, S., Chen, L., Cracco, V., Li, S. K., Tornikoski, M., Rafanelli, P.
Publikováno v:
A&A 614, A148 (2018)
We report simultaneous observations at different energy bands in radio, optical, UV, X-rays and $\gamma$ rays of the flat-spectrum radio-quasar 3C 345. We built the light curve of the source at different frequencies from 2008, the beginning of the \t
Externí odkaz:
http://arxiv.org/abs/1707.07681
Autor:
Congiu, E., Contini, M., Ciroi, S., Cracco, V., Berton, M., Di Mille, F., Frezzato, M., La Mura, G., Rafanelli, P.
We studied the properties of the gas of the extended narrow line region (ENLR) of two Seyfert 2 galaxies: IC 5063 and NGC 7212. We analysed high resolution spectra to investigate how the main properties of this region depend on the gas velocity. We d
Externí odkaz:
http://arxiv.org/abs/1706.08970
Autor:
Berton, M., Foschini, L., Caccianiga, A., Ciroi, S., Congiu, E., Cracco, V., Frezzato, M., La Mura, G., Rafanelli, P.
In recent years, the old paradigm according to which only high-mass black holes can launch powerful relativistic jets in active galactic nuclei (AGN) has begun to crumble. The discovery of $\gamma$-rays coming from narrow-line Seyfert 1 galaxies (NLS
Externí odkaz:
http://arxiv.org/abs/1705.07905
Autor:
Congiu, E., Berton, M., Giroletti, M., Antonucci, R., Caccianiga, A., Kharb, P., Lister, M. L., Foschini, L., Ciroi, S., Cracco, V., Frezzato, M., Järvelä, E., La Mura, G., Richards, J. L., Rafanelli, P.
Publikováno v:
A&A 603, A32 (2017)
We present the first results of a radio survey of 79 narrow-line Seyfert 1 (NLS1) carried out with the Karl G. Jansky Very Large Array (JVLA) at 5 GHz in A configuration aimed at studying the radio properties of these sources. We report the detection
Externí odkaz:
http://arxiv.org/abs/1704.03881
Autor:
Berton, M., Foschini, L., Ciroi, S., Caccianiga, A., Peterson, B. M., Mathur, S., Lister, M. L., Richards, J. L., Congiu, E., Cracco, V., Di Mille, F., Frezzato, M., La Mura, G., Rafanelli, P.
Narrow-line Seyfert 1 galaxies (NLS1s) are active galactic nuclei (AGN) recently identified as a new class of $\gamma$-ray sources. The high energy emission is explained by the presence of a relativistic jet observed at small angles, just like in the
Externí odkaz:
http://arxiv.org/abs/1603.00492
Autor:
Berton, M., Foschini, L., Ciroi, S., Caccianiga, A., Cracco, V., La Mura, G., Di Mille, F., Lister, M. L., Mathur, S., Peterson, B. M., Richards, J. L., Congiu, E., Frezzato, M., Rafanelli, P.
The aim of this work is to understand the nature of the parent population of beamed narrow-line Seyfert 1 galaxies (NLS1s), by studying the physical properties of three parent candidates samples: steep-spectrum radio-loud NLS1s, radio-quiet NLS1s and
Externí odkaz:
http://arxiv.org/abs/1512.00171
Publikováno v:
In Journal of Thrombosis and Haemostasis August 2003 1(8):1724-1729
