Subaru Seminars



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Subaru Seminars are usually held in Room 104 of the Hilo Base Facility, adjacent to the main lobby. Everyone is welcome to attend. If you would like to give a seminar, please contact Subaru seminar organizers (Thayne Currie, Tae-Soo Pyo, Nagayoshi Ohashi) by email : (please change"_at" to @).

August 16, 11am in 104A

" Gravitationally Lensed Quasars Observed with the Subaru Telescope "

Christian Rusu (Subaru)

I will give a brief description of the Subaru Telescope adaptive optics campaign (Rusu et al. 2016) which resulted in high-resolution imaging of 25 gravitationally lensed quasars. I will present some of the interesting objects, as well as show results concerning the SMBH-host galaxy coevolution and the relation between the mass and light profiles of lensing galaxies. In the second half of the talk, I will talk about the recent H0licow analysis which measured the Hubble constant with 3.8% precision from a sample of just 3 lenses.

" The role of group or cluster environment in star formation quenching from z = 0.2 to 1.1 "

Hung-Yu Jian (ASIAA)

I will present some recent results using HSC wide data to study the star formation activity of galaxies down to i ~ 26 in different environments. We make use of the HSC CAMIRA cluster catalog and Mizuki photo-z galaxy catalog constructed in the HSC wide field (S16A) to explore the environmental impact on the star-formation quenching via the stacking technique over 0.2 ~ z ~ 1.1. From our results, we find that the environmental quenching persists to halt the star formation in the low-mass regime due to the existence of the red sequence for low stellar mass galaxies in groups and clusters. In addition, we also find that star-forming galaxies in dense regions are systematically biased toward lower values of specific star formation rate by 0.1 - 0.3 dex with respect to those in the field, and the offsets show no strong redshift evolution, implying a universal slow quenching mechanism acting in the dense environments since z ~ 1.1.

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

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