Zobrazeno 1 - 10
of 128
pro vyhledávání: '"Sulentic, Jack w."'
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:
Sulentic, Jack W., Marziani, Paola, del Olmo, Ascensión, Dultzin, Deborah, Perea, Jaime, Negrete, C. Alenka
[Abridged] Context: The advent of 8-10m class telescopes makes possible for the first time detailed comparison of quasars with similar luminosity and very different redshifts. Aims: A search for z-dependent gradients in line emission diagnostics and
Externí odkaz:
http://arxiv.org/abs/1406.5920
Autor:
Marziani, Paola, Sulentic, Jack W.
We propose a method to identify quasars radiating closest to the Eddington limit, defining primary and secondary selection criteria in the optical, UV and X-ray spectral range based on the 4D eigenvector 1 formalism. We then show that it is possible
Externí odkaz:
http://arxiv.org/abs/1405.2727
Autor:
Martínez-Aldama, Mary Loli, Dultzin, Deborah, Marziani, Paola, Sulentic, Jack W., Chen, Yang, Bressan, Alessandro, Stirpe, Giovanna M.
In order to investigate where and how low ionization lines are emitted in quasars we are studying a new collection of spectra of the CaII triplet at $\lambda$8498, $\lambda$8542, $\lambda$8662 observed with the Very Large Telescope (VLT) using the In
Externí odkaz:
http://arxiv.org/abs/1312.4451
We review the basic techniques for extracting information about quasar structure and kinematics from the broad emission lines in quasars. We consider which lines can most effectively serve as virial estimators of black hole mass. At low redshift the
Externí odkaz:
http://arxiv.org/abs/1310.4361
Autor:
Marziani, Paola, Sulentic, Jack W.
Quasars are the most luminous sources in the Universe. They are currently observed out to redshift z ~ 7 when the Universe was less than one tenth of its present age. Since their discovery 50 years ago astronomers have dreamed of using them as standa
Externí odkaz:
http://arxiv.org/abs/1310.3143
Black Hole Mass (M_BH) estimation in quasars, especially at high redshift, involves use of single epoch spectra with s/n and resolution that permit accurate measurement of the width of a broad line assumed to be a reliable virial estimator. Coupled w
Externí odkaz:
http://arxiv.org/abs/1305.4574
[Abridged] Broad MgII 2800 and Hbeta lines have emerged as the most reliable virial estimators of black hole mass in quasars. Which is more reliable? Comparison of MgII 2800 and Hbeta profile measures in the same sources and especially FWHM measures
Externí odkaz:
http://arxiv.org/abs/1305.1096