Excess entropy and energy feedback from within cluster cores up to r 200
Excess entropy and energy feedback from within cluster cores up to r 200
复制标题
簇核心内的过量熵和能量反馈高达 r 200
DOI：
--
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
M. Malik
中科院分区：
文献类型：
--
作者：
A. Iqbal;S. Majumdar;B. Nath;S. Ettori;D. Eckert;M. Malik
We estimate the "non-gravitational" entropy-injection profiles, $Delta K$, and the resultant energy feedback profiles, $Delta E$, of the intracluster medium for 17 clusters using their Planck SZ and ROSAT X-Ray observations, spanning a large radial range from $0.2r_{500}$ up to $r_{200}$. The feedback profiles are estimated by comparing the observed entropy, at fixed gas mass shells, with theoretical entropy profiles predicted from non-radiative hydrodynamic simulations. We include non-thermal pressure and gas clumping in our analysis. The inclusion of non-thermal pressure and clumping results in changing the estimates for $r_{500}$ and $r_{200}$ by 10\%-20\%. When clumpiness is not considered it leads to an under-estimation of $Delta Kapprox300$ keV cm$^2$ at $r_{500}$ and $Delta Kapprox1100$ keV cm$^2$ at $r_{200}$. On the other hand, neglecting non-thermal pressure results in an over-estimation of $Delta Kapprox 100$ keV cm$^2$ at $r_{500}$ and under-estimation of $Delta Kapprox450$ keV cm$^2$ at $r_{200}$. For the estimated feedback energy, we find that ignoring clumping leads to an under-estimation of energy per particle $Delta Eapprox1$ keV at $r_{500}$ and $Delta Eapprox1.5$ keV at $r_{200}$. Similarly, neglect of the non-thermal pressure results in an over-estimation of $Delta Eapprox0.5$ keV at $r_{500}$ and under-estimation of $Delta Eapprox0.25$ keV at $r_{200}$. We find entropy floor of $Delta Kapprox300$ keV cm$^2$ is ruled out at $approx3sigma$ throughout the entire radial range and $Delta Eapprox1$ keV at more than 3$sigma$ beyond $r_{500}$, strongly constraining ICM pre-heating scenarios. We also demonstrate robustness of results w.r.t sample selection, X-Ray analysis procedures, entropy modeling etc.
We estimate the "non-gravitational" entropy-injection profiles, $Delta K$, and the resultant energy feedback profiles, $Delta E$, of the intracluster medium for 17 clusters using their Planck SZ and ROSAT X-Ray observations, spanning a large radial range from $0.2r_{500}$ up to $r_{200}$. The feedback profiles are estimated by comparing the observed entropy, at fixed gas mass shells, with theoretical entropy profiles predicted from non-radiative hydrodynamic simulations. We include non-thermal pressure and gas clumping in our analysis. The inclusion of non-thermal pressure and clumping results in changing the estimates for $r_{500}$ and $r_{200}$ by 10\%-20\%. When clumpiness is not considered it leads to an under-estimation of $Delta Kapprox300$ keV cm$^2$ at $r_{500}$ and $Delta Kapprox1100$ keV cm$^2$ at $r_{200}$. On the other hand, neglecting non-thermal pressure results in an over-estimation of $Delta Kapprox 100$ keV cm$^2$ at $r_{500}$ and under-estimation of $Delta Kapprox450$ keV cm$^2$ at $r_{200}$. For the estimated feedback energy, we find that ignoring clumping leads to an under-estimation of energy per particle $Delta Eapprox1$ keV at $r_{500}$ and $Delta Eapprox1.5$ keV at $r_{200}$. Similarly, neglect of the non-thermal pressure results in an over-estimation of $Delta Eapprox0.5$ keV at $r_{500}$ and under-estimation of $Delta Eapprox0.25$ keV at $r_{200}$. We find entropy floor of $Delta Kapprox300$ keV cm$^2$ is ruled out at $approx3sigma$ throughout the entire radial range and $Delta Eapprox1$ keV at more than 3$sigma$ beyond $r_{500}$, strongly constraining ICM pre-heating scenarios. We also demonstrate robustness of results w.r.t sample selection, X-Ray analysis procedures, entropy modeling etc.
簇内介质中气体团簇的性质和气体团簇因子
影响因子：
4.8
作者：
Eckert;Simionescu;Brüggen;Ettori
通讯作者：
Ettori