Zobrazeno 51 - 60
of 291
pro vyhledávání: '"Marziani, Paola"'
We study the extreme ultraviolet (EUV) variability (rest frame wavelengths 500 - 920 $\AA$) of high luminosity quasars using HST (low to intermediate redshift sample) and SDSS (high redshift sample) archives. The combined HST and SDSS data indicates
Externí odkaz:
http://arxiv.org/abs/1608.02302
This paper reports on the extreme ultraviolet (EUV) spectrum of three low redshift ($z \sim 0.6$) radio loud quasars, 3C 95, 3C 57 and PKS 0405-123. The spectra were obtained with the Cosmic Origins Spectrograph (COS) of the Hubble Space Telescope. T
Externí odkaz:
http://arxiv.org/abs/1604.03631
Publikováno v:
2015, Astrophysics and Space Science, Volume 360, article id.7, 8 pp
The detection of gravitationally redshifted optical emission lines has been reported just for a few active galaxies. In this paper we give a short overview of studies that analyzed or exploited the detection of the gravitational redshift in optical A
Externí odkaz:
http://arxiv.org/abs/1602.03688
In previous studies, it has been shown that the long term time average jet power, $\overline{Q}$, is correlated with the spectral index in the extreme ultraviolet (EUV), $\alpha_{EUV}$ (defined by $F_{\nu} \sim \nu^{-\alpha_{EUV}}$ computed between 7
Externí odkaz:
http://arxiv.org/abs/1509.02619
We discuss the observational evidences of the morphological transformation of Spirals into S0 galaxies in the cluster environment exploiting two big databases of galaxy clusters: WINGS (0.04 < z < 0.07) and EDisCS (0.4 < z < 0.8). The most important
Externí odkaz:
http://arxiv.org/abs/1508.04572
Autor:
Punsly, Brian, Marziani, Paola
Only a handful of quasars have been identified as kinetically dominated, their long term time averaged jet power, $\overline{Q}$, exceeds the bolometric thermal emission, $L_{bol}$, associated with the accretion flow. This letter presents the first e
Externí odkaz:
http://arxiv.org/abs/1507.01579
Autor:
Sulentic, Jack W., Marziani, Paola
Recently some pessimism has been expressed about our lack of progress in understanding quasars over the 50+ year since their discovery. It is worthwhile to look back at some of the progress that has been made - but still lies under the radar - perhap
Externí odkaz:
http://arxiv.org/abs/1506.01276
Autor:
Martínez-Aldama, Mary Loli, Dultzin, Deborah, Marziani, Paola, Sulentic, Jack W., Bressan, Alessandro, Chen, Yang, Stirpe, Giovanna M.
We present an unprecedented spectroscopic survey of the CaII triplet + OI for a sample of 14 luminous ($-$26 $\gtrsim$ M$_V$ $\gtrsim$ $-$29), intermediate redshift (0.85 $\lesssim$ $z$ $\lesssim$ 1.65) quasars. The ISAAC spectrometer at ESO VLT allo
Externí odkaz:
http://arxiv.org/abs/1501.04718
Autor:
Marziani, Paola, Sulentic, Jack W., Negrete, C. Alenka, Dultzin, Deborah, D'Onofrio, Mauro, del Olmo, Ascensión, Martínez-Aldama, Mary Loli
Publikováno v:
Astronomical Review, Vol. 9, pp. 6-25 (2014)
Highly accreting quasars are characterized by distinguishing properties in the 4D eigenvector 1 parameter space that make them easily recognizable over a broad range range of redshift and luminosity. The 4D eigenvector 1 approach allows us to define
Externí odkaz:
http://arxiv.org/abs/1411.2510
Autor:
Ilić, Dragana, Popović, Luka Č., Burenkov, Alexander, Shablovinskaya, Elena, Malygin, Eugene, Uklein, Roman, Moiseev, Alexei V., Oparin, Dmitry, Patiño Álvarez, Víctor M., Chavushyan, Vahram, Marziani, Paola, D'Onofrio, Mauro, Floris, Alberto, Kovačević, Andjelka B., Jovičić, Jovana, Miković, Djordje, Rakić, Nemanja, Simić, Saša, Marčeta Mandić, Sladjana, Ciroi, Stefano
Publikováno v:
Physics (2624-8174); Mar2024, Vol. 6 Issue 1, p31-45, 15p