scholarly journals Optically and X-Ray Selected Clusters of Galaxies in the XMM/2dF/SDSS Survey

2004 ◽  
pp. 59-62
Author(s):  
S. Basilakos ◽  
M. Plionis ◽  
S. Georgakakis ◽  
I. Georgantopoulos ◽  
T. Gaga ◽  
...  
Keyword(s):  
2007 ◽  
Vol 662 (1) ◽  
pp. 224-235 ◽  
Author(s):  
Dale D. Kocevski ◽  
Harald Ebeling ◽  
Chris R. Mullis ◽  
R. Brent Tully
Keyword(s):  

2020 ◽  
Vol 499 (2) ◽  
pp. 2934-2958
Author(s):  
A Richard-Laferrière ◽  
J Hlavacek-Larrondo ◽  
R S Nemmen ◽  
C L Rhea ◽  
G B Taylor ◽  
...  

ABSTRACT A variety of large-scale diffuse radio structures have been identified in many clusters with the advent of new state-of-the-art facilities in radio astronomy. Among these diffuse radio structures, radio mini-halos are found in the central regions of cool core clusters. Their origin is still unknown and they are challenging to discover; less than 30 have been published to date. Based on new VLA observations, we confirmed the mini-halo in the massive strong cool core cluster PKS 0745−191 (z = 0.1028) and discovered one in the massive cool core cluster MACS J1447.4+0827 (z = 0.3755). Furthermore, using a detailed analysis of all known mini-halos, we explore the relation between mini-halos and active galactic nucleus (AGN) feedback processes from the central galaxy. We find evidence of strong, previously unknown correlations between mini-halo radio power and X-ray cavity power, and between mini-halo and the central galaxy radio power related to the relativistic jets when spectrally decomposing the AGN radio emission into a component for past outbursts and one for ongoing accretion. Overall, our study indicates that mini-halos are directly connected to the central AGN in clusters, following previous suppositions. We hypothesize that AGN feedback may be one of the dominant mechanisms giving rise to mini-halos by injecting energy into the intra-cluster medium and reaccelerating an old population of particles, while sloshing motion may drive the overall shape of mini-halos inside cold fronts. AGN feedback may therefore not only play a vital role in offsetting cooling in cool core clusters, but may also play a fundamental role in re-energizing non-thermal particles in clusters.


1998 ◽  
Vol 298 (2) ◽  
pp. 416-432 ◽  
Author(s):  
C. B. Peres ◽  
A. C. Fabian ◽  
A. C. Edge ◽  
S. W. Allen ◽  
R. M. Johnstone ◽  
...  

1984 ◽  
Vol T7 ◽  
pp. 157-162 ◽  
Author(s):  
R F Mushotzky
Keyword(s):  

Nature ◽  
2001 ◽  
Vol 409 (6816) ◽  
pp. 39-45 ◽  
Author(s):  
Stefano Borgani ◽  
Luigi Guzzo

Results from the Ariel 5 sky survey instrument relating to the properties and the spatial distribution of extragalactic X-ray sources are discussed. The lg N -lg S relation for sources in the 2A catalogue is consistent with a uniform distribution of sources in Euclidean space. In addition, measure­ments of fluctuations in the X-ray background suggest that the Euclidean form of the source counts can be extrapolated to flux levels at least an order of magnitude fainter than the 2A catalogue limit. Information is also available from the optical identification of 2A sources which, through redshift measurements, enables the X-ray luminosity functions of the two main classes of source, namely clusters of galaxies and active galaxies, to be determined. The luminosity functions can be used to calculate the contribution of clusters of galaxies and active galaxies to the diffuse X-ray background in the 2-10 keV range. It is found that cosmological evolution of one or both populations is required to account for the diffuse X-ray background entirely in terms of the integrated emission from these sources.


2005 ◽  
Vol 624 (2) ◽  
pp. 606-629 ◽  
Author(s):  
Tesla E. Jeltema ◽  
Claude R. Canizares ◽  
Mark W. Bautz ◽  
David A. Buote

2002 ◽  
Vol 579 (1) ◽  
pp. 227-235 ◽  
Author(s):  
Ragnvald J. Irgens ◽  
Per B. Lilje ◽  
Hakon Dahle ◽  
S. J. Maddox

2006 ◽  
Vol 2 (S235) ◽  
pp. 203-203
Author(s):  
Y. Hashimoto ◽  
H. Boehringer ◽  
J. P. Henry ◽  
G. Hasinger ◽  
G. Szokoly

AbstractWe report our study of X-ray cluster morphology using a sample of 101 clusters of galaxies at redshift z~0.05-1 taken from the Chandra archive.


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