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Investigation of the errors in SDSS proper-motion measurements using samples of quasars
Investigation of the errors in SDSS proper-motion measurements using samples of quasars
2011/10/17
We investigate in detail the probability distribution function (pdf) of the proper-motion measurement errors in the SDSS+USNO-B proper-motion catalog of \citet{mun04} using clean quasar samples. The p...
Hot-Dust-Poor Quasars in Mid-Infrared and Optically Selected Samples
galaxies evolution quasars general surveys
2010/11/9
We show that the Hot-Dust-Poor (HDP) quasars found in the X-ray selected XMM-COSMOS type
1 AGN sample are just as common in two samples selected at optical/infrared wavelengthes: the
Richards et al....
The Cool-Core Bias in X-ray Galaxy Cluster Samples I: Method And Application To HIFLUGCS
Galaxies clusters general - X-rays galaxies clusters - Galaxies clusters intracluster medium
2010/11/16
Aims. When selecting ux-limited cluster samples, the detection eciency of X-ray instruments is not the same for centrally-peaked and at objects, which introduces a bias in ux-limited cluster samples...
Optical multiband surface photometry of a sample of Seyfert galaxies. I. Large-scale morphology and local environment analysis of matched Seyfert and inactive galaxy samples
galaxies Seyfert – galaxies structure – techniques image processing – techniques photometric
2010/11/12
Context. Parallel analysis of the large-scale morphology and local environment of matched active and control galaxy samples plays an important role in studies of the fueling of active galactic nuclei.
GOYA survey：mergers up to z = 1 in B- and Ks-selected samples。
Observational studies of cataclysmic variable evolution：Of samples, biases and surprises
cataclysmic variable evolution
2009/6/17
Observational studies of cataclysmic variable evolution：Of samples, biases and surprises。
16 December, 2006，The surprises began early on, with the second grain Brownlee worked on in his laboratory -- a calcium-aluminum inclusion, a rare material found in some meteorites. The stunning thing...