Measuring Stellar Velocity Dispersions in Active Galaxies
نویسندگان
چکیده
منابع مشابه
Measuring Stellar Velocity Dispersions in Active Galaxies
We present stellar velocity dispersion (σ∗) measurements for a significant sample of 40 broad-line (Type 1) active galaxies for use in testing the well-known relation between black hole mass and stellar velocity dispersion. The objects are selected to contain Ca II triplet, Mg Ib triplet, and Ca H+K stellar absorption features in their optical spectra so that we may use them to perform extensiv...
متن کاملCosmological Origin of the Stellar Velocity Dispersions in Massive Early-type Galaxies
We show that the observed upper bound on the line-of-sight velocity dispersion of the stars in an early-type galaxy, σe . 400 km s−1, may have a simple dynamical origin within the ΛCDM cosmological model, under two main hypotheses. The first is that most of the stars now in the luminous parts of a giant elliptical formed at redshift z & 6. Subsequently, the stars behaved dynamically just as an ...
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 کاملStellar velocity dispersion in NLS 1 galaxies ⋆
Several authors recently explored the Black-Hole mass (MBH) vs. stellar velocity dispersion (σ∗) relationship for Narrow Line Seyfert 1 galaxies (NLS1s). Their results are more or less in agreement and seem to indicate that NLS1s fill the region below the fit obtained by Tremaine et al. (2002), showing a range of σ∗ similar to that of Seyfert 1 galaxies, and a lower MBH . Until now the [O iii] ...
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 کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2006
ISSN: 0004-637X,1538-4357
DOI: 10.1086/500353