分类: 天文学 >> 天文学 提交时间: 2023-02-19
摘要: (Abridged) We study the galaxy mass-size relation in CARLA spectroscopically
confirmed clusters at $1.410.5$ are
systematically $\gtrsim 0.2-0.3~{\rm dex}$ larger than field ETGs. The passive
ETG average size evolution is slower at $1
分类: 天文学 >> 天文学 提交时间: 2023-02-19
摘要: In this paper we present Multi Unit Spectroscopic Explorer (MUSE) integral field unit spectroscopic observations of the $\sim70\times30$ kpc$^2$ Ly$\alpha$ halo around the radio galaxy 4C04.11 at $z = 4.5077$. High-redshift radio galaxies (HzRGs) are hosted by some of the most massive galaxies known at any redshift and are unique markers of concomitant powerful active galactic nucleus (AGN) activity and star formation episodes. We map the emission and kinematics of the Ly$\alpha$ across the halo as well as the kinematics and column densities of eight HI absorbing systems at $-3500 < \Delta v < 0$ km s$^{-1}$. We find that the strong absorber at $\Delta v \sim 0\,\rm km\,s^{-1}$ has a high areal coverage ($30\times30$ kpc$^2$), being detected across a large extent of the Ly$\alpha$ halo, a significant column density gradient along the southwest to northeast direction, and a velocity gradient along the radio jet axis. We propose that the absorbing structure, which is also seen in CIV and NV absorption, represents an outflowing metal-enriched shell driven by a previous AGN or star formation episode within the galaxy and is now caught up by the radio jet, leading to jet-gas interactions. These observations provide evidence that feedback from AGN in some of the most massive galaxies in the early Universe may play an important role in redistributing material and metals in their environments.
分类: 天文学 >> 天文学 提交时间: 2023-02-19
摘要: (Abridged) To understand if the morphology-density and passive-density
relations are already established at z>1.5, we study galaxies in 16 confirmed
clusters at $1.3
分类: 天文学 >> 天文学 提交时间: 2023-02-19
摘要: Since 2005 ESO has been working with its community and industry to develop an extremely large optical/infrared telescope. ESO's Extremely Large Telescope, or ELT for short, is a revolutionary ground-based telescope that will have a 39-metre main mirror and will be the largest visible and infrared light telescope in the world. To address specific topics that are needed for the science operations and calibrations of the telescope, thirteen specific working groups were created to coordinate the effort between ESO, the instrument consortia, and the wider community. We describe here the goals of these working groups as well as their achievements so far.