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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 @).

December 02, Wednesday, 11:00 am in 104

" The Global Star Formation Laws in Star-forming Galaxies "

Yu Gao

(Purple Mountain Observatory)

The global star formation (SF) laws - the relations between star-forming gas and SF rate (SFR) - are reexamined in a large sample of 181 local star-forming galaxies with infrared luminosities (SFR) spanning almost five orders of magnitude. The surface density of dense molecular gas (as traced by HCN) has the tightest and linear correlation with that of SFR (ΣSFR). The ΣSFR is a steeper function of the total (H2+HI) Σgas than that of molecular gas ΣH2. We further show that the SFR and a variety of dense gas tracers (e.g., HCN, CS, their high-J and high-J CO) are all linearly correlated for both the Galactic dense cores and star-forming galaxies near and far. This has immediate implications on the modes of SF in galaxies because the dense cores are the sites of active SF, and thus the basic units in contributing to SF. The SFR should depend linearly upon the mass of dense molecular gas (the SF law!). These ground-based observations of last decade and recent Herschel results highlight what the ALMA is delivering on the studies of "SF laws" across large redshift ranges over wide SF scales.

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

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