Ruderman, MS; Berghmans, D; Goossens, Marcel; 6746; Poedts, Stefaan; 2601;

The present paper studies the heating of coronal loops by linear resonant Alfven waves that are excited by the motions of the photospheric footpoints of the magnetic field lines. The analysis is restricted to torsionally polarised footpoint motions in an axially symmetric system so that only torsional Alfven waves are excited. For this subclass of ...

Vlahakis, Nektarios Königl, Arieh
Published in
Astrophysics and Space Science

By using relativistic, axisymmetric, ideal MHD, we examine the motion of the baryon/e±/ photon fluid that emanates from a stellar-mass compact object/debris-disk system (a common outcome of many progenitor models). We prove that the motion can be described as a frozen pulse, which permits the study of each shell of the pancake-shaped outflow using ...

Balasubramanyam, R.

A novel optical design for a telescope, especially suited for constructing large telescopes at submillimetre to optical wavelengths, was proposed recently. In this paper, we present some analytical results related to such novel optics. We show that, for oblique incidence, the line focus of a parabolic cylinder merely shifts by the same angle in the...

P'etri, J'erôme
Published in
Astrophysics and Space Science

This is the second of a series of papers aimed to look for an explanation on the generation of high frequency quasi-periodic oscillations (QPOs) in accretion disks around neutron star, black hole, and white dwarf binaries. The model is inspired by the general idea of a resonance mechanism in the accretion disk oscillations as was already pointed ou...

Percival, Will J. Brown, Michael L.

We consider the shape of the likelihood and posterior surfaces to be used when fitting cosmological models to CMB temperature and polarisation power spectra measured from experiments. In the limit of an all-sky survey with Gaussian distributed pixel noise we show that the true combined likelihood of the four CMB power spectra (TT, TE, EE & BB) has ...

Huré, J.-M. Pierens, A. Hersant, F.

We present the exact calculus of the gravitational potential and acceleration along the symmetry axis of a plane, homogeneous, polar cell as a function of mean radius a, radial extension e, and opening angle f. Accurate approximations are derived in the limit of high numerical resolution at the geometrical mean of the inner and outer radii (a key-p...

Baes, Maarten

Cosmological simulations suggest that dark matter haloes are not spherical, but typically moderately to strongly triaxial systems. We investigate methods to convert spherical potential density pairs into axisymmetric ones, in which the basic characteristics of the density profile ( such as the slope at small and large radii) are retained. We achiev...

Van Hese, Emmanuel Baes, Maarten Dejonghe, Herwig

N-body simulations have unveiled several apparently universal properties of dark matter halos, including a cusped density profile, a power-law pseudo-phase-space density rho/sigma(3)(r), and a linear beta-gamma relation between the density slope and the velocity anisotropy. We present a family of self-consistent phase-space distribution functions (...

Tong, Xiao Zhou, JiLin
Published in
Science in China Series G: Physics, Mechanics and Astronomy

GJ 436b is a Neptune-size planet with 23.2 Earth masses in an elliptical orbit of period 2.64 days and eccentricity 0.16. With a typical tidal dissipation factor (Q′∼106) as that of a giant planet with convective envelope, its orbital circularization timescale under internal tidal dissipation is around 1 Ga, at least two times less than the stellar...

Brown, Michael L Challinor, Anthony North, Chris E Johnson, Bradley R {O'Dea}, Daniel Sutton, David

We investigate the impact of both slow and fast polarization modulation strategies on the science return of upcoming ground-based experiments aimed at measuring the B-mode polarization of the cosmic microwave background. Using detailed simulations of the Cl {OVER} experiment, we compare the ability of modulated and un-modulated observations to reco...