Mapping the Circumgalactic Medium and Intergalactic Medium through Lya and MgII Emission

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• Yucheng Guo (Lyon)
• Thursday 15 June 2023, 11:30-12:30
• Battcock F17 + online.

If you have a question about this talk, please contact Sandro Tacchella.

Based on the extremely deep MUSE observation on the Hubble Ultra Deep Field, we map the emission from the intergalactic medium and the circumgalactic medium at the physical scale from hundreds of kpc to around 10 kpc. We observe different physical processes occurring at different distances to the galaxies. In this talk I will report our key findings: (1) Within 15 kpc, we observe the anisotropic MgII emission around galaxies at z~1, supporting a scenario of bi-polar galactic outflows. Our investigation demonstrates the prevalence of this cool and metal-enriched outflow among the population of massive galaxies. (2) For Lya emitters at z=3-4, we observe an average blueshift of the Lya line from the galaxy center to approximately 60 kpc. This provides evidence for the presence of large-scale gas inflows. We map the extended Lya emission out to approximately 270 kpc. (3) Finally we try to reproduce the observed flux and kinematics of the Lya haloes through our simulations to gain further insights.

This talk is part of the Galaxies Discussion Group series.

This talk is included in these lists:

• Battcock F17 + online
• Combined External Astrophysics Talks DAMTP
• Cosmology, Astrophysics and General Relativity
• Galaxies Discussion Group
• Institute of Astronomy Talk Lists
• Kavli Institute for Cosmology Talk Lists

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