J/A+A/619/A68 A2163 VLA 20cm images (Thoelken+, 2018)
Discovery of large scale shock fronts correlated with the radio halo and radio
relic in the A2163 galaxy cluster.
Thoelken S., Reiprich T.H., Sommer M.W., Ota N.
<Astron. Astrophys. 619, A68 (2018)>
=2018A&A...619A..68T 2018A&A...619A..68T (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; X-ray sources
Keywords: galaxies: clusters: general - galaxies: clusters: individual: A2163 -
X-rays: galaxies: clusters - radio continuum: general
Abstract:
In this study, we investigate the X-ray properties of the intracluster
gas and the radio morphology of the extraordinary cluster A2163. 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 M=1.7+0.3-0.2, 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 M=1.5+0.5-0.3 at a distance of
0.7Mpc, which is likely related to a cool core remnant, and a strong
shock with M=3.2+0.6-0.7 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.
Description:
Reduced X-ray and radio images of the galaxy cluster A2163 are
presented. The exposure corrected X-ray mosaic image is obtained with
the Suzaku satellite and data from the XIS1 chip is used. The radio
images are obtained from VLA data at 20cm. Two radio maps are
available: A full image of A2163 with a circular Gaussian beam size of
30arcsec (FWHM) and an image of the extended emission after the
removal of compact sources with a reconstructed beam size of 50arcsec
(FWHM).
Objects:
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RA (2000) DE Designation(s)
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16 15 34.1 -06 07 26 A2163 = ACO 2163
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 143 3 List of fits images
fits/* . 3 Individual fits images
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 48 A19 "datime" Obs.date Observation date
50- 55 F6.4 GHz Freq ? Observed frequency
57- 61 I5 Kibyte size Size of FITS file
63- 91 A29 --- FileName Name of FITS file, in subdirectory fits
93-143 A51 --- Title Title of the FITS file
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Acknowledgements:
Sophia Thoelken, thoelken(at)astro.uni-bonn.de,
Martin W. Sommer, mnord(at)astro.uni-bonn.de
(End) Patricia Vannier [CDS] 25-Sep-2018