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SUMMARY:Special Seminar | Tamal Mukherjee (Macquarie University)
DTSTART:20260623T090000Z
DTEND:20260623T100000Z
DTSTAMP:20260623T095255Z
UID:www.aip.de-2525
CATEGORIES:Scientific
CATEGORIES:Scientific Talk
CATEGORIES:Public
CATEGORIES:Special Seminar
CATEGORIES:Galaxies\, Cosmology
CONTACT:John Pharo <jpharo@aip.de>
DESCRIPTION:Speaker: Tamal Mukherjee (Macquarie University)\nTitle: Myster
 ies in the Peaks: What double-peaked Lyα emission reveals about galaxy-CG
 M interactions\nAbstract: Understanding how galaxies acquire and redistrib
 ute baryons remains one of the key open questions in galaxy evolution. Due
  to its resonant nature\, Lyman-α (Lyα) emission is highly sensitive to 
 the distribution and kinematics of neutral gas\, making it a powerful trac
 er of the gaseous environments surrounding galaxies. In this talk\, I will
  present recent results from VLT/MUSE observations of Lyα emitters at z~3
 –6\, focusing on what the diverse Lyα spectral profiles can tell us abo
 ut gas flows on circumgalactic scales. In particular\, the properties of d
 ouble-peaked Lyα emission\, including peak separation\, trough flux\, pea
 k asymmetry\, reveal systematic variations in neutral hydrogen column dens
 ity and gas kinematics with halo radius. Several systems also appear to be
  promising candidates for ionising photon escape\, linking Lyα spectral p
 roperties to feedback and radiation leakage.\nA small fraction of Lyα emi
 tters show blue-peak dominant profiles\, a rare spectral feature commonly 
 interpreted as a signature of gas inflow. Deep JWST imaging and spectrosco
 py reveal that many of these blue-dominant systems are associated with com
 pact\, ultra-low-mass galaxies embedded within extended Lyα-emitting stru
 ctures. Their young stellar populations and elevated ionisation conditions
  suggest recent star formation likely triggered by the accretion of fresh\
 , low-metallicity gas. Together\, these results highlight how Lyα spectra
 l complexity can provide a direct observational window into the interactio
 n between galaxies and the CGM in the early Universe.\n
LOCATION:AIP\; Kirch building\, Conference room
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