Wednesday, May 03, 2006

Preprints

Sutton & Wandelt present a Bayesian approach to optimal image reconstruction in radio interferometry. They use Gibbs sampling an incorporate an Occam factor.

Seljak et al. combine Ly alpha forest power spectrum results with 3-year WMAP, SN, and galaxy clustering data to constrain cosmological parameters finding the simple 6 parameter model is preferred with no running of the spectral index.

Belanger et al. claim a detection of a 22.2 min quasi-periodic modulation in the X-ray flux during the 2004 Aug 31 Sag A* flare. If this transient event was at the marginally stable orbit this implies an angular momentum parameter of 0.22.

Zucker et al. find a new Milky Way dwarf satellite galaxy at a distance of ~220 kpc using the SDSS data release 5. This discovery suggests other such objects are to be found. The same group report another dwarf galaxy.

Eisenstein et al. argue that the baryon acoustic peak can be reconstructed to correct for non-linear degradation providing significant improvements in determining the distance scale from galaxy surveys.

Bryans et al. present collisional ionization equilibrium calculations using state-of-the-art calculations from DR and RR rates.

Lawrence et al. describe the UKIRT Infrared Deep Sky Survey, a 7-year survey begun in May 05.

Begelman et al. suggest that SS433 is a ULX observed from the side with the radiative output collimated by a massive outflow from the disk at a distance of ~10% of the disk edge.

Sanders & Fabian construct a model for cluster X-ray emission including resonance scattering for several thousand lines. They find that including resonance scattering does not account for the observed dip in the central abundance however allowing for absorbing material within the inner 40 kpc of NGC4696 significantly improves the quality of the fits to the Centaurus cluster.

Forman et al. present the first results from the Chandra 500 ksec observation of M87.

Parkinson et al. apply Bayesian model selection theory to the 3-year WMAP data using the CosmoNest code and find weak evidence for a perturbation slope != 1.

Reiprich compares the 3-year WMAP results with those from the HIFLUGCS galaxy cluster sample and concludes that the new results are in much better agreement than the 1-year WMAP results.

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