Zobrazeno 1 - 10
of 66
pro vyhledávání: '"Rafanelli Piero"'
Autor:
Rafanelli Piero, Siviero Alessandro
Publikováno v:
Open Astronomy, Vol 21, Iss 1-2, Pp 1-4 (2012)
A history of the 1.22 m Galileo telescope of the Asiago Astrophysical Observatory is described.
Externí odkaz:
https://doaj.org/article/3626211815bd4de18c3eaa20748f04a9
Autor:
Ilic, Dragana, Shapovalova, Alla I., Popovic, Luka C., Chavushyan, Vahram, Burenkov, Alexander N., Kollatschny, Wolfram, Kovacevic, Andjelka, Marceta-Mandic, Sladjana, Rakic, Nemanja, La Mura, Giovanni, Rafanelli, Piero
Publikováno v:
2017, Frontiers in Astronomy and Space Sciences, 4, 12
We present the results of the long-term optical monitoring campaign of active galactic nuclei (AGN) coordinated by the Special Astrophysical Observatory of the Russian Academy of Science. This campaign has produced a remarkable set of optical spectra
Externí odkaz:
http://arxiv.org/abs/1803.10860
Autor:
La Mura, Giovanni, Berton, Marco, Chen, Sina, Chougule, Abhishek, Ciroi, Stefano, Congiu, Enrico, Cracco, Valentina, Frezzato, Michele, Mordini, Sabrina, Rafanelli, Piero
The spectra of Active Galactic Nuclei (AGNs) are often characterized by a wealth of emission lines with different profiles and intensity ratios that led to a complicated classification. Their electro-magnetic radiation spans more than 10 orders of ma
Externí odkaz:
http://arxiv.org/abs/1710.10211
Autor:
La Mura, Giovanni, Berton, Marco, Chen, Sina, Ciroi, Stefano, Congiu, Enrico, Cracco, Valentina, Frezzato, Michele, Rafanelli, Piero
Active Galactic Nuclei (AGNs) are characterized by emission of radiation over more than 10 orders of magnitude in frequency. Therefore, the execution of extensive surveys of the sky, with different types of detectors, is providing the attractive poss
Externí odkaz:
http://arxiv.org/abs/1710.01274
Autor:
Congiu, Enrico, Contini, Marcella, Ciroi, Stefano, Cracco, Valentina, Di Mille, Francesco, Berton, Marco, Frezzato, Michele, La Mura, Giovanni, Rafanelli, Piero
We present our recent results about the extended narrow-line region (ENLR) of two nearby Seyfert 2 galaxies (IC 5063 and NGC 7212) obtained by modelling the observed line profiles and spectra with composite models (photoionization+shocks) in the diff
Externí odkaz:
http://arxiv.org/abs/1710.01173
Autor:
Rakic, Nemanja, La Mura, Giovanni, Ilic, Dragana, Shapovalova, Alla I., Kollatschny, Wolfram, Rafanelli, Piero, Popovic, Luka C.
Publikováno v:
A&A 603, A49 (2017)
We investigate the intrinsic Baldwin effect (Beff) of the broad H$\alpha$ and H$\beta$ emission lines for six Type 1 active galactic nuclei (AGNs) with different broad line characteristics: two Seyfert 1 (NGC 4151 and NGC 5548), two AGNs with double-
Externí odkaz:
http://arxiv.org/abs/1703.06188
Autor:
La Mura, Giovanni, Busetto, Giovanni, Ciroi, Stefano, Rafanelli, Piero, Berton, Marco, Congiu, Enrico, Cracco, Valentina, Frezzato, Michele
Relativistic jets of plasma are a key ingredient of many types of Active Galactic Nuclei (AGN). Today we know that AGNs are powered by the accretion of inter stellar material into the gravitational field of a Super Massive Black Hole and that this pr
Externí odkaz:
http://arxiv.org/abs/1702.06779
Autor:
Berton, Marco, Caccianiga, Alessandro, Foschini, Luigi, Peterson, Bradley M., Mathur, Smita, Terreran, Giacomo, Ciroi, Stefano, Congiu, Enrico, Cracco, Valentina, Frezzato, Michele, La Mura, Giovanni, Rafanelli, Piero
Publikováno v:
A&A 591, A98 (2016)
Narrow-line Seyfert 1 galaxies (NLS1s) are an interesting subclass of active galactic nuclei (AGN), which tipically does not exhibit any strong radio emission. Seven percent of them, though, are radio-loud and often show a flat radio-spectrum (F-NLS1
Externí odkaz:
http://arxiv.org/abs/1601.06165
Autor:
Berton, Marco, Foschini, Luigi, Ciroi, Stefano, Cracco, Valentina, La Mura, Giovanni, Lister, Matthew L., Mathur, Smita, Peterson, Bradley M., Richards, Joseph L., Rafanelli, Piero
Publikováno v:
A&A 578, A28 (2015)
Flat-spectrum radio-loud Narrow-Line Seyfert 1 galaxies (NLS1s) are a recently discovered class of $\gamma$-ray emitting Active Galactic Nuclei (AGN), that exhibit some blazar-like properties which are explained with the presence of a relativistic je
Externí odkaz:
http://arxiv.org/abs/1504.02772
Autor:
Popescu, Cristina C., Rafanelli, Piero, Benetti, Stefano, Hopp, Ulrich, Birkle, Kurt, Elsaesser, Hans
We present the properties of the supernova SN 1995ah discovered in a Blue Compact Dwarf galaxy (BCD) around 10 days after the maximum. This is the first supernova event observed in a BCD. The photometric and spectroscopic data suggest that SN 1995ah
Externí odkaz:
http://arxiv.org/abs/astro-ph/9707301