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A2163: Merger events in the hottest Abell galaxy cluster II. Subcluster accretion with galaxy-gas separation
Galaxies clusters general – Galaxies intergalactic medium – X-rays galaxies clusters
2010/11/16
Located at z = 0.203, A2163 is a rich galaxy cluster with an intra-cluster medium (ICM) that exhibits extraordinary properties,including an exceptionally high X-ray luminosity, average temperature, an...
Decision Tree Classifiers for Star/Galaxy Separation
Methods data analysis Catalogues Surveys Virtual observatory tools
2010/11/12
We study the star/galaxy classification eciency of 13 di erent decision tree algorithms applied to photometric objects in the Sloan Digital Sky Survey Data Release Seven (SDSS DR7). Each algorithm is...
The final candidate from the JVAS/CLASS search for 6 arcsec to 15 arcsec image separation lensing
gravitational lensing strong - galaxies clusters general - dark matter
2010/11/9
A search for 6 arcsec to 15 arcsec image separation lensing in the Jodrell Bank–Very Large
Array Astrometric Survey (JVAS) and the Cosmic Lens All-Sky Survey (CLASS) by Phillips
et al. found thirtee...
How to make clean separation of CMB E and B mode from incomplete sky data
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/29
We have investigated CMB E/B decomposition of incomplete sky data. Noting E and B mode decomposition operators in real space involve differentials of CMB polarization, we point out we may make clean E...
Close Separation Triple System QSO 1009–0252 with Discordant Redshifts:
Quasars emission lines absorption lines—individual
2010/9/15
1009-0252 is a Quasi Stellar Object (QSO) with three components A, B, C. A, B are thought to be the result of gravitational lensing of one object, and A, C constitute a close pair with redshifts 2.74 ...
Numerical simulation of dynamos with scale separation
Numerical simulation scale separation magnetic fields
2009/6/4
Explaining the origin of magnetic fields in astrophysical bodies has long beena challenge for theorists. While mean field dynamo theory has been developedfor a while this theory runs into several prob...