Results 101 to 110 of about 254 (138)

A deep investigation of the poorly studied open cluster King 18 using CCD VRI, Gaia DR3 and 2MASS. [PDF]

Sci Rep
Ahmed NM, Bendary R, Samir RM, Elhosseiny EG.   +3 more
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Trends in childhood leukemia incidence in urban countries and their relation to environmental factors, including space weather. [PDF]

Front Public Health
Khabarova O, Pinaev SK, Chakov VV, Chizhov AY, Pinaeva OG.   +4 more
europepmc   +1 more source

Identification of a turnover in the initial mass function of a young stellar cluster down to 0.5 MJ

De Furio M, Meyer M, Greene T, Hodapp K, Johnstone D, Leisenring J, Rieke M, Robberto M, Roellig T, Cugno G, Fiorellino E, Manara C, Raileanu R, Terwisga Sv.   +13 more
europepmc   +1 more source

Evolution of X-ray clusters of galaxies

, 1996
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X-Ray-Imaging Observations of Clusters of Galaxies

Annual Review of Astronomy and Astrophysics, 1982
X-ray imaging has opened new vistas on the structure and evolution of clusters and their member galaxies. Three aspects, reviewed in this contribution, are: the frequency of substructure, and its implications for cosmology, the ratio of gas-mass to galaxy-mass as a function of cluster richness and its implications for the efficiency of galaxy formation,
W. Forman, C. Jones
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X-Ray Studies of Clusters of Galaxies

2008
Clusters of galaxies are next to quasars, the most luminous X-ray sources in the Universe with radiation powers of the order of 1043–1046 erg s−1. The first detection of a cluster source was made with M87 in 1966 by Byram et al. [30], and 5 years later also the massive nearby clusters in the constellations Coma Berenices and Perseus were detected by ...
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X-Ray Emission from Clusters of Galaxies

Space Science Reviews, 1985
The X-ray emission from the intracluster gas is a rich source of information on the metal abundance, evolution and mass profile of clusters. Methods for determining the mass of gas are reviewed; the total mass is uncertain. The best data so far available concentrate on the cluster core. Cooling flows are found within the cores of a significant fraction
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Clusters of galaxies and X-ray sources

Advances in Space Research, 1984
Abstract An attempt is made to compare optical properties of Abell clusters with X-ray sources.
M. Kalinkov, K. Stavrev, I. Kuneva
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The X‐ray evolution of clusters of galaxies

Astronomische Nachrichten, 1998
AbstractThe WARPS survey currently contains 48 X‐ray selected clusters and groups of galaxies, detected serendipitously in ROSAT PSPC archival pointed observations. The survey includes the highest redshift X‐ray selected cluster known (z=0.8325). The redshift range is large enough for evolutionary effects to be studied within the sample.
L. R. Jones, C. Scharf, E. Perlman, H. Ebeling, D. Horner, G. Wegner, M. Malkan, I. Mchardy   +7 more
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The X-ray spectra of clusters of galaxies

Naturwissenschaften, 1979
The identification of extended sources of X-ray emission associated with clusters of galaxies has been one of the major achievements of X-ray astronomy. In this paper the present situation regarding the identification of X-ray clusters is reviewed and the relationship between X-ray and optical cluster properties is briefly discussed.
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