TY - JOUR

T1 - Fossil systems in the 400d cluster catalog

A1 - Voevodkin,Alexey

A1 - Borozdin,Konstantin

A1 - Heitmann,Katrin

A1 - Habib,Salman

A1 - Vikhlinin,Alexey

A1 - Mescheryakov,Alexander

A1 - Hornstrup,Allan

A1 - Burenin,Rodion

AU - Voevodkin,Alexey

AU - Borozdin,Konstantin

AU - Heitmann,Katrin

AU - Habib,Salman

AU - Vikhlinin,Alexey

AU - Mescheryakov,Alexander

AU - Hornstrup,Allan

AU - Burenin,Rodion

PB - Institute of Physics Publishing, Inc

PY - 2010

Y1 - 2010

N2 - We report the discovery of seven new fossil systems in the 400d cluster survey. Our search targets nearby, z ≤ 0.2, and X-ray bright, LX ≥ 10^43 erg s-1, clusters of galaxies. Where available, we measure the optical luminosities from Sloan Digital Sky Survey images, thereby obtaining uniform sets of both X-ray and optical data. Our selection criteria identify 12 fossil systems, out of which five are known from previous studies. While in general agreement with earlier results, our larger sample size allows us to put tighter constraints on the number density of fossil clusters. It has been previously reported that fossil groups are more X-ray bright than other X-ray groups of galaxies for the same optical luminosity. We find, however, that the X-ray brightness of massive fossil systems is consistent with that of the general population of galaxy clusters and follows the same LX-Lopt scaling relation.

AB - We report the discovery of seven new fossil systems in the 400d cluster survey. Our search targets nearby, z ≤ 0.2, and X-ray bright, LX ≥ 10^43 erg s-1, clusters of galaxies. Where available, we measure the optical luminosities from Sloan Digital Sky Survey images, thereby obtaining uniform sets of both X-ray and optical data. Our selection criteria identify 12 fossil systems, out of which five are known from previous studies. While in general agreement with earlier results, our larger sample size allows us to put tighter constraints on the number density of fossil clusters. It has been previously reported that fossil groups are more X-ray bright than other X-ray groups of galaxies for the same optical luminosity. We find, however, that the X-ray brightness of massive fossil systems is consistent with that of the general population of galaxy clusters and follows the same LX-Lopt scaling relation.

U2 - 10.1088/0004-637X/708/2/1376

DO - 10.1088/0004-637X/708/2/1376

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

VL - 708

SP - 1376

EP - 1387

ER -