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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 : sseminar_at_subaru.naoj.org (please change"_at" to @).

January 04, Monday, 11:00 am in 104

" Super Star Clusters and Their Environments "

Sherry Yeh

(Subaru Telescope)


In this talk I will focus on two projects: (1) super star cluster feedback in 30 Doradus, and (2) super star cluster formation near galactic nuclei. I will present the first fully calibrated NEWFIRM H2 1-0 S(1) image of the entire 30 Doradus nebula. Together with a NEWFIRM Brγ image of 30 Doradus, our data reveal the morphologies of the warm molecular gas and ionized gas in 30 Doradus. Based on the morphologies of H2, Brγ, CO, and 8 μm emission, the H2 to Brγ line ratio, and Cloudy models, we find that the H2 emission is formed inside the photodissociated regions of 30 Doradus, 2-3 pc to the ionization front of the H II region, in a relatively low-density environment. Comparisons with Brγ, 8 μm, and CO emission indicate that H2 emission is due to fluorescence, and provide no evidence for shock excited emission of this line. I will also present a straightforward approach to study young and highly obscured super star clusters using ground-based MIR observations, to explore the universality of cluster formation efficiency and cluster mass function near galactic nuclei of face-on spiral galaxies. We mapped the nuclei of NGC 6946, IC 342, Maffei 2, and NGC 7714 in [NeII] using COMICS on Subaru Telescope. We identified 32 super star cluster candidates in [NeII] , as well as very extended emission which is presumably associated with non-compact, field star formation. The cluster formation efficiencies are estimated to be < 20%, while the cluster mass function shows a power-law index of -1.7. The results of cluster formation efficiency and mass function are consistent with that found in other galactic environments, suggesting universal, environment-independent formation processes of super star clusters. I will then end the talk with a brief introduction of the queue-mode operation at Subaru Telescope.


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



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