منابع مشابه
Stellar 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 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 کاملStellar Populations in Active Galaxies
The role of stars and starbursts in AGN has been a recurring issue for nearly as long as AGN have been recognized as hosts of interesting phenomena. The heated “starburst versus monster” controversy of the 80’s and 90’s was gradually replaced by “starburst plus monster” studies, as observational work in the past decade has firmly established that accretion onto a super-massive black-hole and st...
متن کاملOld stellar populations in distant radio galaxies
I describe the current status of our attempts to determine the age of the oldest known stellar populations at high redshift, in the red mJy radio galaxies 53W091 (z = 1.55) and 53W069 (z = 1.43). During the past year the original conclusion of Dunlop et al. (1996) that 53W091 is > 3 Gyr old has been questioned from two, basically orthogonal directions. First, reports that the near-infrared ligh...
متن کاملOld Stellar Populations in Nearby Dwarf Galaxies
What can we learn from the somewhat arduous study of old stellar populations in nearby galaxies? Unless the nearby universe is subtly anomalous, it should contain a relatively normal selection of galaxies whose histories are representative of field galaxies in general throughout the Universe. We can therefore take advantage of our ability to resolve local galaxies into individual stars to direc...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of the Pacific
سال: 1999
ISSN: 0004-6280,1538-3873
DOI: 10.1086/316335