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 2, Wednesday, 11am in 104A

" Dissecting the star formation rate and stellar mass relation of nearby galaxies with the MaNGA survey "

Li-Hwai Lin (ASIAA)

Star-forming galaxies are found to form a tight relation in the star formation rate (SFR) and stellar mass plane, the so-called 'star forming main sequence'. The origin of this relation and how star forming galaxies migrate into the quiescent population remain unanswered. In this talk, I will show that the main sequence may be a result of local correlation between the SFR surface density and the stellar mass surface density on kpc scale based on the resolved stellar populations obtained by the Mapping Nearby Galaxies at Apache Point Observatory IFU survey (MaNGA). In addition, I'll discuss the role of molecular gas in the galaxies that are in transit from the main sequence to the quiescent population from our recent ALMA observations.

" 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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