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Astronomy Colloquium (2018 Spring Semester)

* Date
May 17
* Speaker
Ann Zabludoff (Univ. Arizona)
* Title
Attack of the Lyman-Alpha Blobs: A Multi-Wavelength and Polarization Study
* Abstract
 

 

 

Lyman-alpha blobs are mysterious gas clouds in the distant Universe that extend to tens or even hundreds of kpc. Our team, including astronomers and engineers at SNU and KASI, is conducting multi-wavelength, deep, and large area surveys to identify and study tens of blobs at redshifts 2-5. We show that blobs occupy massive halos likely to evolve into rich groups and clusters of galaxies today. As such, blobs also mark the sites of the formation of the most massive galaxies and of the intracluster medium. However, the blobs’ power source is a puzzle. By targeting optically-thin lines such as Halpha and [OIII], we have obtained the first measurements of gas kinematics in blobs, excluding strong outflows as the source of Lyman-alpha emission. I will present new results characterizing the large-scale environments of blobs and further constraining their power source via polarization mapping.

DateSpeakerTitleRemarks
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(Wednesday)
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March 20
(Tuesday)
Marios Karouzos
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Colloquium
March 22Sangwook Park
(Univ. Texas Arlington)
Chandra X-Ray Kinematics Study of Young Supernova Remnants 
March 29Myoungwon Jeon
(Kyung Hee Univ.)
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April 5이강환
(서대문자연사박물관)
과학커뮤티케이터가 본 과학과 사회Speech
in Korean
April 12Aeree Chung
(Yonsei Univ.)
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April 19 중간고사 (No Colloquium) 
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in Korean
May 3Allard Jan van Marle
(UNIST)
Magnetohydrodynamics of the circumstellar medium 
May 10 한국 천문학회 
May 17Ann Zabludoff
(Univ. Arizona)
Attack of the Lyman-Alpha Blobs: A Multi-Wavelength and Polarization Study 
May 24Ji-Hoon Kim
(SNU)
Upcoming Era in Numerical Galaxy Formation – New Possibilities and Challenges 
May 31Myungshin Im
(Astronomy program, SNU)
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June 7Deokkeun An
(Ewha Womans Univ.)
Demographics of Stellar Populations in the Milky Way Galaxy