منابع مشابه
Thick Disks of Lenticular Galaxies ⋆ 3 D - photometric thin / thick disk decomposition of eight edge - on S 0 galaxies
Thick disks are faint and extended stellar components found around several disk galaxies including our Milky Way. The Milky Way thick disk, the only one studied in detail, contains mostly old disk stars (≈ 10 Gyr), so that thick disks are likely to trace the early stages of disk evolution. Previous detections of thick disk stellar light in external galaxies have been originally made for early-t...
متن کاملRed Thick Disks of Nearby Galaxies
Edge on systems reveal the properties of disk galaxies as a function of height, z, above the plane. Four local edge-on galaxies, that are close enough to have been resolved into stars by the Hubble Space Telescope, show thick disks, composed of a red stellar population, which is old and relatively metal rich. Color gradients, ∆(V-I)/∆z, are zero or slightly positive. Favored models may have an ...
متن کاملThe Kinematics of Thick Disks in Nine External Galaxies
We present kinematic measurements of thin and thick disk components in a sample of nine edge-on galaxies. We extract stellar and ionized gas rotation curves at and above the galaxies’ midplanes using the Ca ii triplet absorption features and Hα emission lines measured with the GMOS spectrographs on Gemini North and South. For the higher mass galaxies in the sample, we fail to detect differences...
متن کاملThe Kinematics of Thick Disks in External Galaxies
We present kinematic measurements of the thick and thin disks in two edge-on galaxies. We have derived stellar rotation curves at and above the galaxies’ midplanes using Ca ii triplet features measured with the GMOS spectrograph on Gemini North. In one galaxy, FGC 1415, the kinematics above the plane show clear rotation that lags that of the midplane by ∼20-50%, similar to the behavior seen in ...
متن کاملLenticular Galaxies and Their Environments
It is widely believed that lenticular (S0) galaxies were initially spirals from which the gas has been removed by interactions with hot cluster gas, or by rampressure stripping of cool gas from spirals that are orbiting within rich clusters of galaxies. However, problems with this interpretation are that: (1) Some lenticulars, such as NGC 3115, are isolated field galaxies rather than cluster me...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2004
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20035932