منابع مشابه
The efficiency of the spiral-in of a black hole to the Galactic centre
We study the efficiency at which a black hole or dense star cluster spirals-in to the Galactic centre. This process takes place on a dynamical friction time scale, which depends on the value of the Coulomb logarithm (lnΛ). We determine the accurate value of this parameter using the direct N -body method, a tree algorithm and a particle-mesh technique with up to 2 million plus one particles. The...
متن کاملThe Galactic centre region
We have observed the central 45 region of the Galaxy at 620 MHz band of the Giant Metrewave Radio Telescope (GMRT) in radio continuum, and measured the polarisation properties of 64 small diameter background extragalactic sources seen through the −6< l <6, −2< b <2 region with the Australia Telescope Compact Array (ATCA) and the Very Large Array (VLA). Our 620 MHz observations show that Sgr A* ...
متن کاملGalactic spiral structure
We describe the structure and composition of six major stellar streams in a population of 20 574 local stars in the New Hipparcos Reduction with known radial velocities. We find that, once fast moving stars are excluded, almost all stars belong to one of these streams. The results of our investigation have led us to re-examine the hydrogen maps of the Milky Way, from which we identify the possi...
متن کاملGalactic Spiral Shocks with Thermal Instability
Using one-dimensional hydrodynamic simulations including interstellar heating, cooling, and thermal conduction, we investigate nonlinear evolution of gas flow across galactic spiral arms. We model the gas as a non-self-gravitating, unmagnetized fluid, and follow its interaction with a stellar spiral potential in a local frame comoving with the stellar pattern. Initially uniform gas with density...
متن کاملenvironment in the Galactic Centre
We address the question of the dynamics in the inner 50 pc of the Galactic Centre. In a first step we investigate the cloud–cloud collision rate in the Circum-nuclear Disk (CND) with the help of a three dimensional N–body code using gas particles that can have inelastic collisions. The CND might be a longer lived structure than previously assumed. The whole disk–like structure of the CND can th...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2012
ISSN: 1742-6596
DOI: 10.1088/1742-6596/372/1/012063