Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Marziani, Paola"'
Autor:
Foschini, Luigi, Barba, Benedetta Dalla, Tornikoski, Merja, Andernach, Heinz, Marziani, Paola, Marscher, Alan P., Jorstad, Svetlana G., Järvelä, Emilia, Antón, Sonia, Bontà, Elena Dalla
We present the results of a comparison between different methods to estimate the power of relativistic jets from active galactic nuclei (AGN). We selected a sample of 32 objects (21 flat-spectrum radio quasars, 7 BL Lacertae Objects, 2 misaligned AGN
Externí odkaz:
http://arxiv.org/abs/2403.17581
Autor:
Panda, Swayamtrupta, Marziani, Paola, Czerny, Bozena, Rodriguez-Ardila, Alberto, Nunez, Francisco Pozo
The investigation of emission line regions within active galaxies (AGNs) has a rich and extensive history, now extending to the use of AGNs and quasars as "standardizable" cosmological indicators, shedding light on the evolution of our universe. As w
Externí odkaz:
http://arxiv.org/abs/2311.13298
NGC 5548 has been hailed as an archetypical type-1 active galactic nuclei (AGN) and serves as a valuable laboratory to study the long-term variation of its broad-line region (BLR). In this work, we re-affirm our finding on the connection between the
Externí odkaz:
http://arxiv.org/abs/2308.05831
Autor:
Panda, Swayamtrupta, Marziani, Paola
Broad lines in active galaxies are primarily emitted by photoionization processes that are driven by the incident continuum arising from a complex geometrical structure circumscribing the supermassive black hole. A model of the broad-band spectral en
Externí odkaz:
http://arxiv.org/abs/2308.05830
Autor:
Foschini, Luigi, Lister, Matthew L., Andernach, Heinz, Ciroi, Stefano, Marziani, Paola, Antón, Sonia, Berton, Marco, Bontà, Elena Dalla, Järvelä, Emilia, Marchã, Maria J. M., Romano, Patrizia, Tornikoski, Merja, Vercellone, Stefano, Vietri, Amelia
Publikováno v:
Universe 2022, 8(11), 587
We considered the fourth catalog of gamma-ray point sources produced by the Fermi Large Area Telescope (LAT) and selected only jetted active galactic nuclei (AGN) or sources with no specific classification, but with a low-frequency counterpart. Our f
Externí odkaz:
http://arxiv.org/abs/2211.03400
Autor:
Panda, Swayamtrupta, Marziani, Paola
A landmark of accretion processes in active galactic nuclei (AGN) is the continuum originating from a complex structure, i.e., an accretion disk and a corona around a supermassive black hole. Modelling the broad-band spectral energy distribution (SED
Externí odkaz:
http://arxiv.org/abs/2210.15041
Autor:
Śniegowska, Marzena, Panda, Swayamtrupta, Czerny, Bożena, Savić, Đorge, Martínez-Aldama, Mary Loli, Marziani, Paola, Wang, Jian-Min, Du, Pu, Popović, Luka Č., Saraf, Chandra Shekhar
Publikováno v:
A&A 678, A63 (2023)
Narrow Line Seyfert 1 (NLSy1) galaxies have been shown to have high Eddington ratios and relatively small black hole masses. The measurement of the black hole masses is based on the virial relation which is dependent on the distribution of the line-e
Externí odkaz:
http://arxiv.org/abs/2202.13839
The issue of the difference between optical and UV properties of radio-quiet and radio-loud (relativistically "jetted") active galactic nuclei (AGN) is a long standing one, related to the fundamental question of why a minority of powerful AGN possess
Externí odkaz:
http://arxiv.org/abs/2112.02632
We report preliminary results on the analysis of the continuum and H$\beta$ light curves of the type-1 active galactic nucleus (AGN) NGC 5548. We notice a clear signature of shallowing in the trend between the H$\beta$ and the continuum luminosities.
Externí odkaz:
http://arxiv.org/abs/2111.05378
Autor:
Punsly, Brian, Frey, Sandor, Reynolds, Cormac, Marziani, Paola, Pushkarev, Alexander, Chen, Sina, Li, Shang, Kharb, Preeti
PKS\,1351$-$018 at a redshift of $z=3.71$ is one of the most luminous, steady synchrotron sources with a luminosity $> 10^{47}$\,erg~s$^{-1}$. The synchrotron luminosity does not seem to vary by more than $\sim 25\%$ over 35 years. In order to apprec
Externí odkaz:
http://arxiv.org/abs/2107.00716