Zobrazeno 1 - 3
of 3
pro vyhledávání: '"Marziani, Paola"'
Publikováno v:
Open Astronomy, Vol 20, Iss 3, Pp 472-475 (2011)
Quasars show a considerable spectroscopic diversity. However, the variety of quasar spectra at low redshifts is non-random: a principal component analysis applied to large samples customarily identifies two main eigenvectors. In this contribution we
Externí odkaz:
https://doaj.org/article/14f2cd5a9a8449e0b5b3d265686484a2
Publikováno v:
Open Astronomy, Vol 20, Iss 3, Pp 427-434 (2011)
We present evidence for two populations of quasars showing distinctly different broad line structure and kinematics. The first evidence for quasar dichotomy involve differences between radio-quiet and radio-loud sources. We proposed an alternate popu
Externí odkaz:
https://doaj.org/article/6981d489126f419aa0dd507bb1a71c32
Publikováno v:
Open Astronomy, Vol 20, Iss 3, Pp 406-413 (2011)
Determining the masses of the central compact object believed to power all active galactic nuclei is relevant to our understanding of their evolution and of their inner workings. Keys to present-day mass estimates are: (1) the assumption of line broa
Externí odkaz:
https://doaj.org/article/7cf1df652e5e4db6aed293939d168e61