Beygu, B.
Hudaverdi, M.
Ercan, N.
Clusters of galaxies are thought to form by accretion of galaxies along the cosmic filaments, and merging of clusters formed earlier. Observations and hydrodynamic simulations show the strong effects of mergers on physical conditions of the Intra Cluster Medium (ICM). In this work, we investigate five relatively nearby Abell clusters; A3705 (z= 0.089), A2440 (z= 0.090), A2933 (z= 0.092), A3888 (z= 0.152) and A115 (z= 0.193). Temperature; and metal abundance map are created using wavelet. algorithms. Peculiar regions are spectrally studied and large scale of deviations are observed. Based on the results merging histories of our cluster sample are interpreted.


Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS
Acciari, V. A.; et. al. (IOP Publishing, 2008-05-20)
The multiwavelength observation of the nearby radio galaxy M87 provides a unique opportunity to study in detail processes occurring in active galactic nuclei from radio waves to TeV gamma-rays. Here we report the detection of gamma-ray emission above 250 GeV from M87 in spring 2007 with the VERITAS atmospheric Cerenkov telescope array and discuss its correlation with the X-ray emission. The gamma-ray emission is measured to be pointlike with an intrinsic source radius less than 4.5'. The differential energy...
HESS observations of PKS 2155-304
Aharonian, F; et. al. (2005-02-01)
The high-frequency peaked BL Lac PKS 2155-304 at redshift z=0.117 has been detected with high significance (similar to45sigma) at energies greater than 160 GeV, using the H.E.S.S. stereoscopic array of imaging air-Cherenkov telescopes in Namibia. A strong signal is found in each of the data sets corresponding to the dark periods of July and October, 2002, and June-September, 2003. The observed flux of VHE gamma rays shows variability on time scales of months, days, and hours. The monthly-averaged integral f...
Measurement of the t(t)over-bar production cross section using events in the e mu final state in pp collisions at root s=13 TeV
Khachatryan, V.; et. al. (2017-03-01)
The cross section of top quark-antiquark pair production in proton-proton collisions at root s = 13 TeV is measured by the CMS experiment at the LHC, using data corresponding to an integrated luminosity of 2.2 fb(-1). The measurement is performed by analyzing events in which the final state includes one electron, one muon, and two or more jets, at least one of which is identified as originating from hadronization of a b quark. The measured cross section is 815 +/- 9 (stat) +/- 38 (syst) +/- 19 (lumi) pb, in...
Evolution Of Rotating Low Mass Stars With Angular-Momentum Loss
KIZILOGLU, N (1991-03-01)
The evolutionary behavior of rotating low mass stars has been investigated with angular momentum loss by the magnetic stellar wind through the pre-main sequence and on the zero age main sequence phases. As the stars contract toward the zero age main sequence, angular momentum is removed from the convective envelope under the assumption that initially only the convective envelope is spun down in low mass stars. It is obtained that most of the angular momentum loss occurs prior to reaching the zero age main s...
Optical imaging and spectroscopic observation of the galactic supernova remnant G85.9-0.6
GÖK, FATMA; Sezer, A.; Aktekin, E.; Guever, T.; Ercan, N. (Springer Science and Business Media LLC, 2009-11-01)
Optical CCD imaging with H alpha and [SII] filters and spectroscopic observations of the galactic supernova remnant G85.9-0.6 have been performed for the first time. The CCD image data are taken with the 1.5 m Russian-Turkish Telescope (RTT150) at TBA degrees TAK National Observatory (TUG) and spectral data are taken with the Bok 2.3 m telescope on Kitt Peak, AZ.
Citation Formats
B. Beygu, M. Hudaverdi, and N. Ercan, “BINARY CLUSTERS OBSERVED WITH XMM-NEWTON X-RAY OBSERVATORY,” 2008, vol. 86, p. 117, Accessed: 00, 2020. [Online]. Available: