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SUMMARY:The Silver Lining of Galactic Cirrus: From Foreground Nuisance to 
 a New Probe of the Diffuse ISM
DTSTART:20261105T023000Z
DTEND:20261105T033000Z
DTSTAMP:20261106T172000Z
UID:indico-event-5420@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Qing Liu（刘青）\n\nTitle: The Silver Lining of 
 Galactic Cirrus: From Foreground Nuisance to a New Probe of the Diffuse IS
 MTime: 10:30-11:30 (UTC+8)\, 5 November 2026\, ThursdayHost: Xianzhong Zhe
 ngJoin Tencent Meeting：https://meeting.tencent.com/dm/gOWuPFZRmer6Meetin
 g ID: 389661963 (no password)\nAbstract: The faint\, diffuse universe rem
 ains largely unexplored. Many interesting phenomena such as stellar halos\
 , tidal debris and intracluster light (ICL)\, which record how galaxies an
 d clusters assemble\, await detailed mapping. Below a surface brightness o
 f 30 mag/arcsec²\, however\, a large fraction of the sky turns out to be 
 “cloudy”: Galactic cirrus\, the glow of Milky Way starlight scattered 
 by interstellar dust\, can mimic or obscure those extragalactic emission. 
 Yet the complex morphology of cirrus offers a novel view of the diffuse in
 terstellar medium (ISM). I will show how structural analysis of cirrus rev
 eals coherent filaments with scale-free statistics across different ISM tr
 acers\, reflecting the interplay of turbulence\, magnetic fields\, and the
 rmal processes in the diffuse ISM. I will present a statistical method bas
 ed on these analyses that combines the multiscale cirrus structure with fa
 r-infrared dust maps to reconstruct the optical Galactic foreground. I wil
 l show its application to the galaxy cluster Abell 2390 imaged by the Eucl
 id Space Telescope\, where foreground removal greatly reduces the bias and
  uncertainties of ICL measurements\, and discuss implications about its as
 sembly history. The two roles of cirrus are not independent: understanding
  the properties of cirrus yields better foreground models for extragalacti
 c light\, while deep imaging surveys provide high-resolution images probin
 g ISM physics.\nBio:Qing Liu is currently an Oort Postdoctoral Fellow at L
 eiden Observatory in the Netherlands. He obtained his Ph.D. from the Unive
 rsity of Toronto in 2024 and a B.S. from the University of Science and Tec
 hnology of China in 2018. His research interests focus on low surface brig
 htness emission including diffuse galaxies\, intracluster light\, and diff
 use Galactic light\, using data from Euclid\, CFHT\, Herschel\, Planck and
  the Dragonfly Telescope. He is a member of the Local Universe science wor
 king group of the Euclid Consortium and a member of the ESA ARRAKIHS missi
 on. \n\n \n\nhttps://indico-tdli.sjtu.edu.cn/event/5420/
LOCATION:Tsung-Dao Lee Institute/S4F-SW - Open Area (Tsung-Dao Lee Institu
 te)
URL:https://indico-tdli.sjtu.edu.cn/event/5420/
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