Can I read Finding Fossil Groups: Optical Identification and X-ray Confirmation on EtoBox?

Finding Fossil Groups: Optical Identification and X-ray Confirmation by Miller, Eric D.; Rykoff, Eli; Dupke, Renato; de Oliveira, Claudia Mendes; de Oliveira, Raimundo Lopes; Proctor, Robert; Garmire, Gordon; Koester, Benjamin; McKay, Timothy is a scholarly article available to read on EtoBox.

What is Finding Fossil Groups: Optical Identification and X-ray Confirmation about?

We report the discovery of 12 new fossil groups of galaxies, systems dominated by a single giant elliptical galaxy and cluster-scale gravitational potential, but lacking the population of bright galaxies typically seen in galaxy clusters. These fossil groups (FGs), selected from the maxBCG optical cluster catalog, were detected in snapshot observations with the Chandra X-ray Observatory. We detail the highly successful selection method, with an 80% success rate in identifying 12 FGs from our target sample of 15 candidates. For 11 of the systems, we determine the X-ray luminosity, temperature, and hydrostatic mass, which do not deviate significantly from expectations for normal systems, spanning a range typical of rich groups and poor clusters of galaxies. A small number of detected FGs are morphologically irregular, possibly due to past mergers, interaction of the intra-group medium (IGM) with a central AGN, or superposition of multiple massive halos. Two-thirds of the X-ray-detected FGs exhibit X-ray emission associated with the central BCG, although we are unable to distinguish between AGN and extended thermal galaxy emission using the current data. This sample, a large increase

Author

Miller, Eric D.; Rykoff, Eli; Dupke, Renato; de Oliveira, Claudia Mendes; de Oliveira, Raimundo Lopes; Proctor, Robert; Garmire, Gordon; Koester, Benjamin; McKay, Timothy

Published

2011

Language

EN