Zobrazeno 1 - 10
of 185
pro vyhledávání: '"Stirpe, G"'
Publikováno v:
A&A 669, A83 (2023)
We aim to evaluate the behaviour of our 22 high-redshift (2.2 < z < 3.7) and high-luminosity (47.39 < Lbol < 48.36) quasars in the context of the 4-Dimensional Eigenvector 1. Our approach involves studying quasar physics through spectroscopic explora
Externí odkaz:
http://arxiv.org/abs/2211.03853
Autor:
Marziani, P., del Olmo, A., Negrete, C. A., Dultzin, D., Piconcelli, E., Vietri, G., Martinez-Aldama, M. L., D'Onofrio, Mauro, Bon, E., Bon, N., Machado, A. Deconto, Stirpe, G. M., Rios, T. Buendia
The identification of a virial broadening estimator in the quasar UV rest frame suitable for black hole mass computation at high redshift has become an important issue. We compare the HI Balmer H-beta line width to the ones of two intermediate ioniza
Externí odkaz:
http://arxiv.org/abs/2205.07034
Autor:
Marziani, P., Dultzin, D., Del Olmo, A., D'Onofrio, M., de Diego, J. A., Stirpe, G. M., Bon, E., Bon, N., Czerny, B., Perea, J., Panda, S., Martinez-Aldama, M. L., Negrete, C. A.
The main sequence offers a method for the systematization of quasar spectral properties. Extreme FeII emitters (or extreme Population A, xA) are believed to be sources accreting matter at very high rates. They are easily identifiable along the quasar
Externí odkaz:
http://arxiv.org/abs/2002.07219
Autor:
Dultzin, D., Marziani, P., de Diego, J. A., Negrete, C. A., Del Olmo, A., Martínez-Aldama, M. L., D'Onofrio, M., Bon, E., Bon, N., Stirpe, G. M.
Publikováno v:
Front. Astron. Space Sci. 6:80 (2020)
Quasars accreting matter at very high rates (known as extreme Population A [xA] quasars, possibly associated with super-Eddington accreting massive black holes) may provide a new class of distance indicators covering cosmic epochs from present day up
Externí odkaz:
http://arxiv.org/abs/2001.10368
Autor:
Marziani, P., Bon, E., Bon, N., Martinez-Aldama, M. L., Stirpe, G. M., D'Onofrio, M., del Olmo, A., Negrete, C. A., Dultzin, D.
Quasars accreting matter at very high rates (known as extreme Population A [xA]) may provide a new class of distance indicators covering cosmic epochs from present day up to less than 1 Gyr from the Big Bang. We report on the developments of a method
Externí odkaz:
http://arxiv.org/abs/1908.08700
Autor:
Marziani, P., del Olmo, A., Martinez-Carballo, M. A., Martinez-Aldama, M. L., Stirpe, G. M., Negrete, C. A., Dultzin, D., Onofrio, M. D', Bon, E., Bon, N.
The inter-line comparison between high- and low-ionization emission lines has yielded a wealth of information on the quasar broad line region (BLR) structure and dynamics, including perhaps the earliest unambiguous evidence in favor of a disk + wind
Externí odkaz:
http://arxiv.org/abs/1905.00617
Autor:
Marziani, P., Bon, E., Bon, N., del Olmo, A., Martínez-Aldama, M. L., D'Onofrio, M., Dultzin, D., Negrete, C. A., Stirpe, G. M.
Quasars accreting matter at very high rates (known as extreme Population A [xA] or super-Eddington accreting massive black holes) provide a new class of distance indicators covering cosmic epochs from the present-day Universe up to less than 1 Gyr fr
Externí odkaz:
http://arxiv.org/abs/1901.10032
Autor:
Marziani, P., del Olmo, A., Onofrio, M. D', Dultzin, D., Negrete, C. A., Martiinez-Aldama, M. L., Bon, E., Bon, N., Stirpe, G. M.
Publikováno v:
PoS(NLS1-2018)002
Narrow-line Seyfert 1s (NLSy1s) are an ill-defined class. Work done over the past 20 years as well as recent analyses show a continuity in properties (e.g., Balmer line profiles, blueshifts of high-ionization lines) between sources with FWHM above an
Externí odkaz:
http://arxiv.org/abs/1807.03003
Autor:
Marziani, P., Dultzin, D., Sulentic, J. W., Del Olmo, A., Negrete, C. A., Martinez-Aldama, M. L., D'Onofrio, M., Bon, E., Bon, N., Stirpe, G. M.
The last 25 years saw a major step forward in the analysis of optical and UV spectroscopic data of large quasar samples. Multivariate statistical approaches have led to the definition of systematic trends in observational properties that are the basi
Externí odkaz:
http://arxiv.org/abs/1802.05575
Autor:
Marziani, P., Negrete, C. A., Dultzin, D., Martinez-Aldama, M. L., Del Olmo, A., D'Onofrio, M., Stirpe, G. M.
The most luminous quasars (with bolometric luminosities are 1E47 erg/s) show a high prevalence of CIV {\lambda}1549 and [OIII]{\lambda}{\lambda}4959,5007 emission line profiles with strong blueshifts. Blueshifts are interpreted as due to Doppler effe
Externí odkaz:
http://arxiv.org/abs/1709.05691