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Chemistry in a gravitationally unstable protoplanetary disc
stars: pre-main-sequence, stars: circumstellar matter, protoplanetary discs, astrochemistry
2011/10/9
Until now, axisymmetric, alpha-disc models have been adopted for calculations of the chemical composition of protoplanetary discs. While this approach is reasonable for many discs, it is not appropria...
Gravitationally Induced Density Wake of a Circularly Orbiting Object As an Interpretative Framework of Ubiquitous Spirals and Arcs
Induced Density Circularly Orbiting Interpretative Framework Ubiquitous Spirals
2011/10/9
An orbiting object in a gas rich environment creates a gravitational density wake containing information about the object and its orbit. Using linear perturbation theory, we analyze the observable pro...
SDSS J133401.39+331534.3: A New Subarcsecond Gravitationally Lensed Quasar
Subarcsecond Gravitationally Lensed Quasar
2011/9/29
The quasar SDSS J133401.39+331534.3 at z = 2.426 is found to be a two-image gravitationally lensed quasar with the image separation of 0.833. The object is first identified as a lensed quasar candidat...
The image jets modeling of gravitationally lensed sources
jets gravitational lensing Hubble constant B0218+357
2010/11/11
The jets image modelling of gravitationally lensed sources have been performed. Several basic
models of the lens mass distribution were considered, in particular, a singular isothermal ellip-soid, an...
Modelling the shapes of the largest gravitationally bound objects
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2011/1/4
We combine the physics of the ellipsoidal collapse model with the excursion set theory to study the shapes of dark matter halos. In particular, we develop an analytic approximation to the nonlinear ev...