197 research outputs found
The Impact of Suzaku Measurements on Astroparticle Physics
Results from the Suzaku X-ray broad-band observations of clusters of galaxies
are summarized. Aiming at understanding the physics of gas heating/particle
acceleration and the cluster dynamical evolution, we search for non-thermal
hard X-ray emission from merging clusters, particularly A2163 and the Bullet
Cluster, based on the Suzaku and XMM-Newton/Chandra joint analyses. The
observed hard X-ray emission is well represented by single- or
multi-temperature thermal models, including super-hot (kT~20 keV) gas. However,
no significant non-thermal hard X-ray emission has been detected. Together with
the presently available literature, the hard X-ray properties have been studied
for about 10 clusters with Suzaku. The present status on Suzaku measurements of
non-thermal X-ray emission and the cluster magnetic field are summarized and
compared with those from the RXTE, BeppoSAX, and Swift satellites. The future
prospects are briefly mentioned.Comment: To appear in Acta Polytechnica. Invited talk at the Vulcano Workshop
2012 "Frontier Objects in Astrophysics and Particle Physics". 6 pages, 3
figures. Typo correcte
THE IMPACT OF SUZAKU MEASUREMENTS ON ASTROPARTICLE PHYSICS
Results from the Suzaku X-ray broad-band observations of clusters of galaxies are summarized. Aiming at understanding the physics of gas heating/particle acceleration and the cluster dynamical evolution, we search for non-thermal hard X-ray emission from merging clusters, particularly A2163 and the Bullet Cluster, based on the Suzaku and XMM-Newton/Chandra joint analyses. The observed hard X-ray emission is well represented by single- or multi-temperature thermal models, including super-hot (kT ~ 20 keV) gas. However, no significant non-thermal hard X-ray emission has been detected. Together with the presently available literature, the hard X-ray properties have been studied for about 10 clusters with Suzaku. The present status on Suzaku measurements of non-thermal X-ray emission and the cluster magnetic field are summarized and compared with those from the RXTE, BeppoSAX, and Swift satellites. The future prospects are briefly mentioned
THE IMPACT OF SUZAKU MEASUREMENTS ON ASTROPARTICLE PHYSICS
Results from the Suzaku X-ray broad-band observations of clusters of galaxies are summarized. Aiming at understanding the physics of gas heating/particle acceleration and the cluster dynamical evolution, we search for non-thermal hard X-ray emission from merging clusters, particularly A2163 and the Bullet Cluster, based on the Suzaku and XMM-Newton/Chandra joint analyses. The observed hard X-ray emission is well represented by single- or multi-temperature thermal models, including super-hot (kT ~ 20 keV) gas. However, no significant non-thermal hard X-ray emission has been detected. Together with the presently available literature, the hard X-ray properties have been studied for about 10 clusters with Suzaku. The present status on Suzaku measurements of non-thermal X-ray emission and the cluster magnetic field are summarized and compared with those from the RXTE, BeppoSAX, and Swift satellites. The future prospects are briefly mentioned
Detection of Iron Emission Line from the Galaxy Cluster Including the Radio Galaxy 3C220.1 at z=0.62
We have detected an emission line feature at 4 keV in the X-ray emission from
a sky region including the distant radio galaxy 3C220.1(z=0.62) obtained with
ASCA. The line energy is 6.1 - 7.0 keV (90% confidence) in the rest frame of
3C220.1. Within the present statistics, the observed spectra are consistent
with two different models: a non-thermal model consisting of a power-law
continuum plus a 6.4 keV iron emission line, and a Raymond-Smith thin-thermal
emission model of kT ~6 keV with a metal abundance of ~0.5 solar. However,
because of the large (~ 500 eV) equivalent width of the line, a significant
fraction of the X-ray emission is likely to arise from the hot intracluster gas
associated with the galaxy cluster that includes 3C220.1. The spectral
parameters of the thermal emission are consistent with the
luminosity-temperature relation of nearby clusters.Comment: 15 pages, 5 ps figures, accepted for publication in the Astrophysical
Journa
Discovery of large scale shock fronts correlated with the radio halo and radio relic in the A2163 galaxy cluster
Imprints of galaxy cluster formation processes are visible in the
intracluster medium and can arise in shock fronts, which are detectable via
discontinuities in e.g. the gas temperature and density profiles. In this
study, we investigate the X-ray properties of the intracluster gas and the
radio morphology of the extraordinary cluster A2163. This cluster shows an
irregular morphology in various wavelengths and has one of the most luminous
and extended known radio halos. Additionally, it is one of the hottest clusters
known. We analyze two Suzaku observations of A2163, one in the north-east (NE)
and one in the south-west (SW) direction, and use archival XMM-Newton data to
remove point sources in the field of view. To compare our findings in the X-ray
regime with the radio emission, we obtain radio images of the cluster from an
archival VLA observation at 20cm. We identify three shock fronts in A2163 in
our spectral X-ray study. A clear shock front lies in the NE direction at a
distance of 1.4Mpc from the center, with a Mach number of
, estimated from the temperature discontinuity. This shock
coincides with the position of a known radio relic. We identify two additional
shocks in the SW direction, one with at a distance of
0.7Mpc, which is likely related to a cool core remnant, and a strong shock with
at a distance of 1.3Mpc, which also closely matches the
radio contours. The complex structure of A2163 as well as the different Mach
numbers and shock velocities suggest a merging scenario with two unequal
merging constituents, where two shock fronts emerged in an early stage of the
merger and traveled outwards while an additional shock front developed in front
of the merging cluster cores.Comment: 9 pages, 7 figures, accepted by A&
Desenvolvimento rural : o ecoturismo como atividade potencial para a melhoria das condiçőes socioeconômicas e ambientais de Guaraqueçaba /
Orientadora: Raquel R.B.NegrelleCo-orientadores: Marcos Aurélio Silveira e Maria Vitória Yamada MullerDissertaçăo (mestrado) - Universidade Federal do Paraná, Setor de Cięncias Agrárias, Programa de Pós-Graduaçăo em Agronomia. Defesa: Curitiba, 2008Inclui bibliografia e anexosÁrea de concentraçăo: Produçăo vegeta
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