Discovery of four gravitational lensing systems by clusters in the SDSS DR6
نویسندگان
چکیده
منابع مشابه
Discovery of Four New Lensing Systems by Clusters in the Sdss Dr6
We report the discovery of 4 new strong lensing systems by visual inspection of the Sloan Digital Sky Survey images of galaxy clusters in Data Release 6 (SDSS DR6). Two of them show Einstein rings, and the others show tangential giant arcs. These arcs or rings have large angle separations of > 8 from the bright central galaxies and show blue color compared to the red cluster galaxies. In additi...
متن کاملDiscovery of Strong Lensing Clusters in the Sdss Dr6
We discovered strong gravitational lensing in 4 galaxy clusters by visual inspection of the Sloan Digital Sky Survey images in Data Release 6 (SDSS DR6). Two of them show the Einstein rings, and the other two show tangential giant arcs. These arcs or rings have large angle separations of > 8 from the bright central galaxies. The lensed images in general are bluer than cluster member galaxies. T...
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Clusters of galaxies in most previous catalogs have redshifts z ≤ 0.3. Using the photometric redshifts of galaxies from the Sloan Digital Sky Survey Data Release 6 (SDSS DR6), we identify 39,716 clusters in the redshift range 0.05 < z < 0.6 with more than eight luminous (Mr ≤ −21) member galaxies. Cluster redshifts are estimated accurately with an uncertainty less than 0.022. The contamination ...
متن کاملGravitational Lensing by Nearby Clusters of Galaxies
We present an estimation of the expected number of arcs and arclets in a sample of nearby (z < 0.1) clusters of galaxies, that takes into account the magnitude limit of the Visiting Astronomer at Cerro Tololo Inter-American Observatory. CTIO is operated by AURA, Inc. under contract to the National Science Foundation.
متن کاملWeak Gravitational Lensing by Dark Clusters
We calculate the abundance of dark-matter concentrations that are sufficiently overdense to produce a detectable weak-gravitational-lensing signal. Most of these overdensities are virialized halos containing identifiable X-ray and/or optical clusters. However, a significant fraction are nonvirialized, cluster-mass, overdensities still in the process of gravitational collapse—these should produc...
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ژورنال
عنوان ژورنال: Research in Astronomy and Astrophysics
سال: 2009
ISSN: 1674-4527
DOI: 10.1088/1674-4527/9/1/002