Dynamical modelling of galactic disc outskirts
نویسندگان
چکیده
منابع مشابه
The Dynamical Properties of Stellar Systems in the Galactic Disc K2
We postulate that stars in the Galactic field are born in aggregates of binary stars with half mass radii R 0.5 and number of binaries N bin which are dynamically equivalent to the dominant mode cluster (N bin , R 0.5) ≈ (200, 0.8 pc). Binary orbits are distributed according to an initial period distribution which is consistent with pre-main sequence data. Stellar masses are paired at random fr...
متن کاملStellar dynamical evidence against a cold disc origin for stars in the Galactic Centre
Observations of massive stars within the central parsec of the Galaxy show that, while most stars orbit within a well-defined disc, a significant fraction have large eccentricities and / or inclinations with respect to the disc plane. Here, we investigate whether this dynamically hot component could have arisen via scattering from an initially cold disc – the expected initial condition if the s...
متن کاملProbing the Age of the Galactic Disc
We report on near IR (J and K bands) observations of two 8× 8 (arcmin) regions centered on the old open clusters Berkeley 17 and Berkeley 18, for which only optical photometry (in B,V and I bands) exists. J and K photometry allows us to obtain an independent estimate of cluster metallicity by means of the relationship between the spectroscopic metallicity and the Red Giant Branch (RGB) slope ca...
متن کاملThe maximum rotation of a galactic disc
The observed stellar velocity dispersions of galactic discs show that the maximum rotation of a disc is on average 63%of the observedmaximumrotation. This criterion can, however, not be applied to small or low surface brightness (LSB) galaxies because such systems show, in general, a continuously rising rotation curve until the outermost measured radial position. That is why a general relation ...
متن کاملthe Gould Belt vs. the Galactic disc
We present new population synthesis calculations of close young neutron stars. In comparison with our previous investigation we use a different neutron star mass spectrum and different initial spatial and velocity distributions. The results confirm that most of ROSAT dim radioquiet isolated neutron stars had their origin in the Gould Belt. Several tens of young neutron stars can be identified i...
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: Proceedings of the International Astronomical Union
سال: 2016
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921316009339