Search Publications
Some results on the radio-SZ correlation for galaxy cluster radio halos
Basu, K.
We present correlation results for the radio halo power in galaxy clusters with the integrated thermal Sunyaev-Zel'dovich (SZ) effect signal, including new results obtained at sub-GHz frequencies. The radio data is compiled from several published works, and the SZ measurements are taken from the Planck ESZ cluster catalog. The tight correlation be…
X-ray emission from RX J1720.1+2638 and Abell 267: A comparison between a fossil and a non-fossil system
Jiménez-Bailón, E.; Aguerri, J. A. L.; Lozada-Muñoz, M.
We present the XMM-Newton X-ray analysis of RX J1720.1+2638 and Abell 267, a non-fossil and a fossil system, respectively. The whole spectrum of both objects can be explained by thermal emission. The luminosities found for RX J1720.1+2638 and Abell 267 in the 2-10 keV band are 6.20+0.04-0.02{×}1044 and 3.90+0.…
Bulk motion measurements in clusters of galaxies with ATHENA-like missions
Nevalainen, J.
The hierarchical formation of clusters of galaxies by accretion of material releases gravitational energy which dissipates into the intracluster gas. The process heats the material and generates gas turbulence and bulk motions and thus kinetic pressure. Mapping the velocity fields of the moving subunits would enable a new diagnostics tool for clus…
X-ray measurement of the elemental abundances at the outskirts of the Perseus cluster with Suzaku
Hayashida, K.; Tsunemi, H.; Ueda, S. +1 more
We report on the abundance of metals (Mg and Fe) in the intracluster medium (ICM) at the outskirts (0.2 r200-0.8 r200) of the Perseus cluster. The X-ray spectra were obtained in the Suzaku/XIS mapping observations of this region. We employ single temperature models to fit all the X-ray spectra. The ICM temperature smoothly de…
The XMM Cluster Survey: Present status and latest results
Miller, C. J.; Romer, A. K.; Mehrtens, N. +11 more
The XMM Cluster Survey (XCS) is a serendipitous search for galaxy clusters using all publicly available data in the XMM-Newton Science Archive. Our recent first data release (XCS-DR1) contains 503 optically confirmed groups and clusters, among which 256 new to the literature and 357 whose X-ray emission was detected for the first time. We discuss …
Search for galaxy-ICM interaction in rich clusters of galaxies
Shimasaku, K.; Gandhi, P.; Xu, Haiguang +7 more
Based on optical and X-ray data for a sample of 34 relaxed rich clusters with redshift of 0.1-0.9, we studied the relative spatial distribution of the two major baryon contents, the cluster galaxies and the hot plasmas. Using photometric data taken with the UH88 telescope, we determined the integrated radial light profiles of member galaxies in ea…
Multiwavelength studies of Markarian galaxies
Mickaelian, A. M.; Abrahamyan, H. V.; Paronyan, G. M. +1 more
Markarian galaxies are the result of the First Byurakan Survey (FBS) conducted in 1965-1980 by B.E. Markarian et al. The sample consists of 1515 UV-excess galaxies containing many active galaxies, both AGN and starburst (SB) galaxies that are interesting from the point of view of galaxy evolution and multiwavelength studies. Several catalogs of Ma…
X-ray study of clusters at the outer edge and beyond
Akamatsu, H.; Ohashi, T.; Takei, Y. +2 more
We report on recent Suzaku results on cluster outer regions. Relaxed clusters show a monotonous temperature decline to the virial radii, reaching 1/3 to 1/4 of the central levels. Significant temperature jumps have been confirmed for a number of radio relics, including A 3667, A 3376, and CIZA J2242.8+5301. This confirms that the radio relics gene…
Scaling relations with a complete sample of galaxy groups
Lovisari, L.; Reiprich, T. H.
Galaxy clusters are an attractive tool to constrain cosmological parameters and well-determined scaling relations between X-ray observables and cluster mass give us a precious diagnostic to study the thermodynamical history of the intra-cluster medium (ICM). We are in the process of improving the accuracy of scaling relations using a complete samp…
The spectroscopic orbit of the K-giant binary γ Canis Minoris
Strassmeier, K. G.; Weber, M.; Pourbaix, D. +2 more
We have determined an improved orbit for the bright, evolved, double lined binary γ Canis Minoris. The system has an orbital period of 389.31 days and an eccentricity of 0.2586. We have revised the secondary to primary mass ratio to 0.987. The spectral types of the primary and secondary are K4 III and K1: III, respectively, and the components have…