Subaru Seminars



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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 (Tadayuki Kodama, Kumiko S. Usuda, Naoyuki Tamura, Tomonori Usuda) by email : sseminar_at_subaru.naoj.org (please change"_at" to @).

November 5, Friday, at 11:00 am

" High-resolution Sunyaev-Zel'dovich effect studies of galaxy clusters and beyond "

Tetsu Kitayama

(Toho University)


The Sunyaev-Zel'dovich effect (SZE), the inverse Compton scattering of CMB photons off hot electrons, provides a unique probe of the intracluster medium. We show how high angular resolution observations of the SZE can reveal the thermal structures of galaxy clusters including the shocks associated with violent mergers. ALMA will be particularly powerful for this purpose and play complementary roles in tracing cluster evolution to other facilities including Subaru and ASTRO-H. We also discuss how the imprint of gas inhomogeneities at even smaller scales can bias the measurements of cosmological parameters, such as H_0 from the SZE and X-ray joint analysis. Apparent agreement of the H_0 value with those derived from other methods, e.g., CMB, is shown to degrade once recent changes in the Chandra calibration database are taken into account, suggesting further the presence of residual systematics. Our results imply both galaxy clusters themselves and the details of the instruments must be better understood to enable reliable precision cosmology with clusters.


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



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