Zobrazeno 1 - 10
of 290
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:
Mengistue, Shimeles Terefe, Marziani, Paola, del Olmo, Ascensión, Pović, Mirjana, Perea, Jaime, Machado, Alice Deconto
Publikováno v:
A&A 685, A116 (2024)
Context. An optically thick, geometrically thin accretion disk (AD) around a supermassive black hole might contribute to broad-line emission in type-1 active galactic nuclei (AGN). However, emission line profiles are most often not immediately consis
Externí odkaz:
http://arxiv.org/abs/2402.14094
Autor:
Marziani, Paola, Floris, Alberto, Deconto-Machado, Alice, Panda, Swayamtrupta, Śniegowska, Marzena, Garnica, Karla, Dultzin, Deborah, D'Onofrio, Mauro, Del Olmo, Ascensión, Bon, Edi, Bon, Nataša
The 4D Eigenvector 1 sequence has proven to be a highly effective tool for organizing observational and physical properties of type 1 active galactic nuclei (AGN). In this paper, we present multiple measurements of metallicity for the broad line regi
Externí odkaz:
http://arxiv.org/abs/2401.02266
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
Autor:
Terefe, Shimeles, Del Olmo, Ascensión, Marziani, Paola, Pović, Mirjana, Martínez-Carballo, María Angeles, Perea, Jaime, Márquez, Isabel
This paper presents new optical and near-UV spectra of 11 extremely powerful jetted quasars, with radio to optical flux density ratio $>$ 10$^3$, that concomitantly cover the low-ionization emission of \mgii\ and \hb\ as well as the \feii\ blends in
Externí odkaz:
http://arxiv.org/abs/2308.06080
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:
Popović, Luka C., Ilić, Dragana, Burenkov, Alexander, Álvarez, Victor Manuel Patiño, Marceta-Mandić, Sladjana, Dojcinović, Jelena Kovacević, Shablovinskaya, Elena, Kovacević, Andjelka B., Marziani, Paola, Chavushyan, Vahram, Wang, Jian-Min, Li, Yan-Rong, Mediavilla, Evencio G.
Publikováno v:
A&A 675, A178 (2023)
We analyze the broad H$\beta$ line profile variability of the "changing look" active galactic nucleus (CL-AGN) NGC 3516 over a long period of 25 years. The observed change in the broad line profile may indicate a change in the geometry of the broad l
Externí odkaz:
http://arxiv.org/abs/2306.00669
Optical and UV properties of radio-quiet (RQ) and radio-loud (RL, relativistically "jetted") active galactic nuclei (AGN) are known to differ markedly; however, it is still unclear what is due to a sample selection and what is associated with intrins
Externí odkaz:
http://arxiv.org/abs/2303.13250
Autor:
Naddaf, Mohammad Hassan, Martinez-Aldama, Mary Loli, Marziani, Paola, Panda, Swayamtrupta, Sniegowska, Marzena, Czerny, Bozena
Publikováno v:
A&A 675, A43 (2023)
We test a scenario claiming that the broad absorption line (BAL) phenomenon in quasars (QSOs) is not a temporary stage of their life. In this scenario, we see the BAL effect only if the line of sight is within a spatially limited and collimated massi
Externí odkaz:
http://arxiv.org/abs/2212.08222