论文标题
700 ks chandra蜘蛛网领域II：蜘蛛网星系中逆孔子和热弥散发射的证据
The 700 ks Chandra Spiderweb Field II: Evidence for inverse-Compton and thermal diffuse emission in the Spiderweb galaxy
论文作者
论文摘要
我们基于深（700 ks）Chandra观察，介绍了Z = 2.16及其核发射时蜘蛛网星系周围弥漫发射的X射线成像和光谱分析。我们表征了核排放，并由于仪器PSF的翅膀而计算了周围区域的污染。 Then, we quantified the extended emission within 12". We find that the Spiderweb galaxy hosts a mildly absorbed quasar, with modest yet significant variability on a timescale of ~1 year. We find that the emission in the jet regions is well described by a power law with Gamma~2-2.5, and it is consistent with IC upscattering of the CMB photons by the relativistic electrons. We also find a roughly在〜100 kpc的半径内，对称性的发射与来自kt温度的热量ICM一致n_e =（1.51+-0.24+-0.14）e-2 cm^{ - 3}，对应于<=（1.76+-0.30+-0.17）的总质量的上限，E+12 m_sun（如果分别为1个sigma统计和系统范围，则iCM equim for himeribriibr， kpc）=（1.5^{+0.5} _ { - 0.3}）e+13 m_sun，并在较大的半径上进行排出，我们估计总质量m_ {500} =（3.2^{+1.1} _ { - 0.1} _ { - 0.6}）蜘蛛网原始群集在12个Arcsec的半径内显示出显着的弥散发射，其主要贡献是由与射流区域以外的IC散射提供的，我们还确定了在大约100 kpc的半径内的热发射，从而揭示了可能代表胚胎病毒式病毒式风量的热量的热，差异。
We present the X-ray imaging and spectral analysis of the diffuse emission around the Spiderweb galaxy at z=2.16 and of its nuclear emission, based on a deep (700 ks) Chandra observation. We characterize the nuclear emission and computed the contamination in the surrounding regions due to the wings of the instrument PSF. Then, we quantified the extended emission within 12". We find that the Spiderweb galaxy hosts a mildly absorbed quasar, with modest yet significant variability on a timescale of ~1 year. We find that the emission in the jet regions is well described by a power law with Gamma~2-2.5, and it is consistent with IC upscattering of the CMB photons by the relativistic electrons. We also find a roughly symmetric, diffuse emission within a radius of ~100 kpc. This emission is consistent with thermal bremsstrahlung from a hot ICM with a temperature of kT=2.0_{-0.4}^{+0.7} keV, and a metallicity of Z<1.6Z_sun. The average electron density within 100 kpc is n_e=(1.51+-0.24+-0.14)E-2 cm^{-3}, corresponding to an upper limit for the total ICM mass of <=(1.76+-0.30+-0.17)E+12 M_sun (where error bars are 1 sigma statistical and systematic, respectively). If we apply hydrostatic equilibrium to the ICM, we measure a total gravitational mass M(<100 kpc)=(1.5^{+0.5}_{-0.3})E+13 M_sun and, extrapolating at larger radii, we estimate a total mass M_{500}=(3.2^{+1.1}_{-0.6})E+13 M_sun within a radius of r_{500}=(220+-30) kpc. We conclude that the Spiderweb protocluster shows significant diffuse emission within a radius of 12 arcsec, whose major contribution is provided by IC scattering associated with the radio jets. Outside the jet regions, we also identified thermal emission within a radius of ~100 kpc, revealing the presence of hot, diffuse baryons that may represent the embryonic virialized halo of the forming cluster.
