Zobrazeno 11 - 20
of 291
pro vyhledávání: '"Marziani, Paola"'
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:
Garnica, Karla, Negrete, C. Alenka, Marziani, Paola, Dultzin, Deborah, Śniegowska, Marzena, Panda, Swayamtrupta
Publikováno v:
A&A 667, A105 (2022)
We present an analysis of UV spectra of quasars at intermediate redshifts believed to belong to the extreme Population A (xA), aimed to estimate the chemical abundances of the broad line emitting gas. We follow the approach described in a previous wo
Externí odkaz:
http://arxiv.org/abs/2208.02387
Autor:
D'Onofrio, Mauro1,2 (AUTHOR) cesare.chiosi@unipd.it, Marziani, Paola2 (AUTHOR), Chiosi, Cesare1 (AUTHOR), Negrete, Castalia Alenka3 (AUTHOR) alenka@astro.unam.mx
Publikováno v:
Universe (2218-1997). Jun2024, Vol. 10 Issue 6, p254. 38p.
Autor:
Bao, Dong-Wei, Brotherton, Michael S., Du, Pu, McLane, Jacob N., Zastrocky, T. E., Olson, Kianna A., Fang, Feng-Na, Zhai, Shuo, Huang, Zheng-Peng, Wang, Kai, Zhao, Bi-Xuan, Li, Sha-Sha, Yang, Sen, Chen, Yong-Jie, Liu, Jun-Rong, Yao, Zhu-Heng, Peng, Yue-Chang, Guo, Wei-Jian, Songsheng, Yu-Yang, Li, Yan-Rong, Jiang, Bo-Wei, Kasper, David H., Chick, William T., Nguyen, My L., Maithil, Jaya, Kobulnicky, H. A., Dale, D. A., Hand, Derek, Adelman, C., Carter, Z., Murphree, A. M., Oeur, M., Schonsberg, S., Roth, T., Winkler, Hartmut, Marziani, Paola, D'Onofrio, Mauro, Hu, Chen, Xiao, Ming, Xue, Suijian, Czerny, Bożena, Aceituno, Jesús, Ho, Luis C., Bai, Jin-Ming, Wang, Jian-Min
In this third paper of the series reporting on the reverberation mapping (RM) campaign of active galactic nuclei with asymmetric H$\beta$ emission-line profiles, we present results for 15 Palomar-Green (PG) quasars using spectra obtained between the
Externí odkaz:
http://arxiv.org/abs/2207.00297
Gaseous outflows appear to be a universal property of type-1 and type-2 active galactic nuclei (AGN). The main diagnostic is provided by emission features shifted to higher frequency via the Doppler effect, implying that the emitting gas is moving to
Externí odkaz:
http://arxiv.org/abs/2203.09196
Autor:
Punsly, Brian, Groeneveld, Christian, Hill, Gary J., Marziani, Paola, Zeimann, Gregory R., Schneider, Donald P.
The compact steep spectrum radio source, 3C 298, (redshift of 1.44) has the largest 178 MHz luminosity in the 3CR (revised Third Cambridge Catalogue) catalog; its radio lobes are among the most luminous in the Universe. The plasma state of the radio
Externí odkaz:
http://arxiv.org/abs/2203.00723
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
Publikováno v:
Astron. Nachr.,1 (2021)
Different properties of quasars may be observed and analysed through the many ranges of the electromagnetic spectrum. Pioneering studies showed that an "H-R diagram" for quasars was needed to organize these data, and that more than two dimensions wer
Externí odkaz:
http://arxiv.org/abs/2112.01178