منابع مشابه
AGN Zoo and Classications of Active Galaxies
We review the variety of Active Galactic Nuclei (AGN) classes (so-calledAGN zoo") and classification schemes of galaxies by activity types based on their optical emission-line spectrum, as well as other parameters and other than optical wave-length ranges. A historical overview of discoveries of various types of active galaxies is given, including Seyfert galaxies, radio galaxies, QSOs, BL Lace...
متن کاملStellar Populations in the Central Galaxies of Fossil Groups
It is inferred from the symmetrical and luminous X-ray emission of fossil groups that they are mature, relaxed galaxy systems. Cosmological simulations and observations focusing on their dark halo and inter-galactic medium properties confirm their early formation. Recent photometric observations suggest that, unlike the majority of non-fossil brightest group galaxies (BGGs), the central early-t...
متن کاملGalaxies.
We have determined the mass function of loose groups of galaxies in the Las Campanas Redshift Survey. Loose groups of galaxies in the LCRS range in mass from M ∼ 10 12 M ⊙ to 10 15 M ⊙. We find that the sample is complete for masses in the interval 8 · 10 13 − 8 · 10 14 M ⊙. In this interval the mass function of LCRS loose groups is close to that found by Girardi et al. (1998). Comparison of th...
متن کاملNew NLS1 galaxies detected among RASS galaxies
Six Narrow-Line Seyfert 1 galaxies have been discovered in optical follow-up spectroscopy of nuclei of galaxies selected for their high X-ray flux in the ROSAT All Sky Survey. We give X-ray and optical parameters of the sources and show optical spectra.
متن کاملFrom Tidal Dwarf Galaxies to Satellite Galaxies
The current popular cosmological models have granted to the population of dwarf satellite galaxies a key role: their number, location and masses constrain both the distribution of dark matter and the physical evolution of their hosts. In the past years, there has been increasing observational evidence that objects with masses of dwarf galaxies can form in the tidal tails of colliding galaxies a...
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ژورنال
عنوان ژورنال: Transactions of the International Astronomical Union
سال: 2007
ISSN: 0251-107X
DOI: 10.1017/s0251107x00026766