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MApping the Most Massive Overdensity Through Hydrogen (MAMMOTH) |
Seminar Title | MApping the Most Massive Overdensity Through Hydrogen (MAMMOTH) | | | Speaker: | Dr. Zheng Cai | | | Affiliation: | (University of Arizona) | | | When | Wednesday morning , Apr. 29, 10:30 a.m | | | Where: | Room 619, Office Block, 2 West Beijing Road (PMO, CAS) | | | Welcome to Attend | | | ( PMO Academic Committee & Academic Circulating committee) | | Abstract We have undertaken a survey of the most massive galaxy structures in the early universe at z=2-4, traced by regions of the highest optical depth from IGM Lyα absorption over large scale of 10-30 Mpc. Our cosmological simulations show a strong correlation between the optical depth of intergalactic Ly-alpha absorption and mass overdensities at scales of 10- 40 Mpc. Based on our simulations and MMT observations, we have developed technique to search for the largest IGM Lyα absorption systems. By examining the absorption spectra of ∼60,000 quasar sight-lines in the SDSS-III at z = 2.32 ± 0.04 we have identified the first field that traced by group of IGM Lyα absorbers, which then can be probed in Ly-alpha emission with our custom narrowband filter. The overdense nature of this field is further suggested by a high concentration of quasars at the same redshift. Our KPNO-4m/MOSAIC narrowband imaging and follow-up LBT/MODS spectroscopy have successfully revealed the large-scale galaxy overdensities in this field. Both our simulation and early observational results suggest the largest IGM Ly-alpha absorption systems could be used as a powerful way of tracing most massive galaxy structures in the early universe. In this talk, I will also highlight the great potential of using future ambitious survey like SDSS-IV, DESI, etc., to conduct the studies of the IGM and most massive large-scale structures. |
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Copyright? Purple Mountain Observatory, CAS, No.10 Yuanhua Road, Qixia District, Nanjing 210023, China
Phone: 0086 25 8333 2000 Fax: 8333 2091 http://english.pmo.cas.cn |
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