X-ray study of the merging galaxy cluster Abell 3411-3412 with XMM-Newton and Suzaku. (arXiv:2007.15976v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Zhang_X/0/1/0/all/0/1">X. Zhang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Simionescu_A/0/1/0/all/0/1">A. Simionescu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Akamatsu_H/0/1/0/all/0/1">H. Akamatsu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kaastra_J/0/1/0/all/0/1">J. S. Kaastra</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Plaa_J/0/1/0/all/0/1">J. de Plaa</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Weeren_R/0/1/0/all/0/1">R. J. van Weeren</a>
Context: Chandra observations of the Abell 3411-3412 merging system have
revealed an outbound bullet-like sub-cluster in the northern part and many
surface brightness (SB) edges at the southern periphery, where multiple diffuse
sources are also reported from radio observations. Notably, a south-eastern
radio relic associated with fossil plasma from a radio galaxy and with a
detected X-ray edge provides direct evidence of shock re-acceleration. The
properties of the reported X-ray edges have yet to be constrained from a
thermodynamic view.
Aims: We use the XMM-Newton and Suzaku observations to reveal the
thermodynamical nature of the reported re-acceleration site and other X-ray
edges. Meanwhile, we aim to investigate the temperature profile in the
low-density outskirts with Suzaku data.
Methods: We perform both imaging and spectral analysis to measure the density
jump and the temperature jump across multiple known X-ray SB discontinuities.
We present a new method to calibrate the XMM-Newton soft proton background.
Archival Chandra, Suzaku, and ROSAT data are used to estimate the cosmic X-ray
background and Galactic foreground levels with improved accuracy compared to
standard blank sky spectra.
Results: At the south-eastern edge, both XMM-Newton and Suzaku’s temperature
jumps point to a $mathcal{M}sim1.2$ shock, which agrees with result from SB
fits with Chandra, and supports the re-acceleration scenario at this shock
front. The southern edge shows a more complex scenario, where a shock and the
presence of stripped cold material may coincide. The Suzaku temperature
profiles in the southern low density regions are marginally higher than the
typical relaxed cluster temperature profile. The measured value
$kT_{500}=4.84pm0.04pm0.19$ keV with XMM-Newton and
$kT_{500}=5.17pm0.07pm0.13$ keV with Suzaku are significantly lower than
previously inferred from Chandra.
Context: Chandra observations of the Abell 3411-3412 merging system have
revealed an outbound bullet-like sub-cluster in the northern part and many
surface brightness (SB) edges at the southern periphery, where multiple diffuse
sources are also reported from radio observations. Notably, a south-eastern
radio relic associated with fossil plasma from a radio galaxy and with a
detected X-ray edge provides direct evidence of shock re-acceleration. The
properties of the reported X-ray edges have yet to be constrained from a
thermodynamic view.
Aims: We use the XMM-Newton and Suzaku observations to reveal the
thermodynamical nature of the reported re-acceleration site and other X-ray
edges. Meanwhile, we aim to investigate the temperature profile in the
low-density outskirts with Suzaku data.
Methods: We perform both imaging and spectral analysis to measure the density
jump and the temperature jump across multiple known X-ray SB discontinuities.
We present a new method to calibrate the XMM-Newton soft proton background.
Archival Chandra, Suzaku, and ROSAT data are used to estimate the cosmic X-ray
background and Galactic foreground levels with improved accuracy compared to
standard blank sky spectra.
Results: At the south-eastern edge, both XMM-Newton and Suzaku’s temperature
jumps point to a $mathcal{M}sim1.2$ shock, which agrees with result from SB
fits with Chandra, and supports the re-acceleration scenario at this shock
front. The southern edge shows a more complex scenario, where a shock and the
presence of stripped cold material may coincide. The Suzaku temperature
profiles in the southern low density regions are marginally higher than the
typical relaxed cluster temperature profile. The measured value
$kT_{500}=4.84pm0.04pm0.19$ keV with XMM-Newton and
$kT_{500}=5.17pm0.07pm0.13$ keV with Suzaku are significantly lower than
previously inferred from Chandra.
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