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The Subaru Seminar is usually held in Room 104 of the Hilo Base Facility, adjacent to the main lobby. Everyone is welcome to attend. If you are interested in giving a seminar, please contact Subaru seminar organizers (Tae-Soo Pyo, Sherry Yeh, Nagayoshi Ohashi) by email : (please change"_at" to @).

May 19, Thursday, 11:00 am in 104B

" A survey for line-emitting galaxies around a possible DLA cluster "

Kazuyuki Ogura

(Ehime University)

I will talk about my study for surveying over-density regions through damped Ly-alpha absorption (DLA) systems. The over-density region is a key component to understanding the structure formation in the Universe. It should be noted that previous surveys for high-z over-density regions need emission from galaxies. However, in the high-z Universe, large fraction of baryons in galaxies could be in the gas phase and thus could be missed. We are focusing on the DLA which is a class of quasar absorption-line systems to study about gases at high-z. Since DLA can be recognized as by their H I column densities regardless of their luminosities, we can effectively investigate the nature of gases in the high-z Universe through the DLAs. We are now working to examine the nature of the DLAs and their environments. Based on the BOSS DLA catalog, we investigated the spatial and redshift distribution of DLAs and found some possible ``DLA clusters'' where there are some DLAs in very narrow regions. To examine whether or not those possible DLA clusters corresponds to over-density regions, narrow-band imaging observations are useful. In this talk, we report the results of our Subaru/Suprime-Cam narrow-band observation for line-emitting galaxies around some possible DLA clusters.

Seminars are also held at JAC, CFHT, and IfA.

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