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- W3203937109 abstract "We report the discovery of eMACSJ0252.4$-$2100 (eMACSJ0252), a massive and highly evolved galaxy cluster at $z=0.703$. Our analysis of Hubble Space Telescope imaging and VLT/MUSE and Keck/DEIMOS spectroscopy of the system finds a high velocity dispersion of 1020$^{+180}_{-190}$ km s$^{-1}$ and a high (if tentative) X-ray luminosity of $(1.2pm 0.4)times10^{45}$ erg s$^{-1}$ (0.1$-$2.4 keV). As extreme is the system's brightest cluster galaxy, a giant cD galaxy that forms stars at a rate of between 85 and 300 M$_odot$ yr$^{-1}$ and features an extended halo of diffuse [OII] emission, as well as evidence of dust. Its most remarkable properties, however, are an exceptionally high ellipticity and a radially symmetric flow of gas in the surrounding intracluster medium, potential direct kinematic evidence of a cooling flow. A strong-lensing analysis, anchored by two multiple-image systems with spectroscopic redshifts, finds the best lens model to consist of a single cluster-scale halo with a total mass of $(1.9pm0.1)times 10^{14}$ M$_odot$ within 250 kpc of the cluster core and, again, an extraordinarily high ellipticity of $e=0.8$. Although further, in-depth studies across the electromagnetic spectrum (especially in the X-ray regime) are needed to conclusively determine the dynamical state of the system, the properties established so far suggest that eMACSJ0252 must have already been highly evolved well before $zsim 1$, making it a prime target to constrain the physical mechanisms and history of the co-evolution or dark-matter halos and baryons in the era of cluster formation." @default.
- W3203937109 created "2021-10-11" @default.
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- W3203937109 date "2021-09-23" @default.
- W3203937109 modified "2023-10-18" @default.
- W3203937109 title "An extreme case of galaxy and cluster co-evolution at <i>z</i> = 0.7" @default.
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- W3203937109 doi "https://doi.org/10.1093/mnras/stab2725" @default.
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