منابع مشابه
Sagittarius: the Nearest Dwarf Galaxy
We have discovered a new Galactic satellite galaxy in the constellation of Sagittar-ius. The Sagittarius dwarf galaxy subtends an angle of 10 degrees on the sky, lies at a distance of 24 kpc and is comparable in size and luminosity to the largest dwarf spheroidal, Fornax. The new galaxy has many features in common with the other eight Galactic dwarf spheroidal systems: including an extended low...
متن کاملThe exotic chemical composition of the Sagittarius dwarf Spheroidal galaxy
Context. The Sagittarius dwarf Spheroidal Galaxy is the nearest neighbor of the Milky Way. Moving along a short period quasi-polar orbit within the Halo, it is being destroyed by the tidal interaction with our Galaxy, losing its stellar content along a huge stellar stream. Aims. We study the detailed chemical composition of 12 giant stars in the Sagittarius dwarf Spheroidal main body, together ...
متن کاملAre the Bulge C– stars in the Sagittarius dwarf galaxy?
Part of the mystery around the Bulge carbon stars from Azzopardi et al. (1991) is solved, when they belong to the Sagittarius dwarf galaxy. The carbon stars are not metal-rich as previously thought, but they have a metallicity comparable to the LMC, with an age between 0.1 – 1 Gyr. A significant fraction of the Sagittarius dwarf carbon stars have luminosities fainter than the lower LMC and SMC ...
متن کاملThe Orbit and Mass of the Sagittarius Dwarf Galaxy
Possible orbital histories of the Sgr dwarf galaxy are explored. A special-purpose N body code is used to construct the first models of the Milky Way – Sgr Dwarf system in which both the Milky Way and the Sgr Dwarf are represented by full N -body systems and followed for a Hubble time. These models are used to calibrate a semi-analytic model of the Dwarf’s orbit that enable us to explore a wide...
متن کاملStellar Populations of the Sagittarius Dwarf Irregular Galaxy
We present deep BV RI CCD photometry of the stars in the dwarf irregular galaxy SagDIG. The color-magnitude diagrams of the measured stars in SagDIG show a blue plume which consists mostly of young stellar populations, and a well-defined red giant branch (RGB). The foreground reddening of SagDIG is estimated to be E(B − V ) = 0.06. The tip of the RGB is found to be at ITRGB = 21.55 ± 0.10 mag. ...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2010
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/712/1/516