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 : (please change"_at_" to @).

August 01, Monday, at 11:00 am

" Near-infrared spectroscopy of passively evolving galaxies at z>1.4 with Subaru/MOIRCS "

Masato Onodera

(ETH Zurich, Switzerland)

Typical spectroscopic surveys aiming at z>1.4 galaxies have been conducted with optical instruments and targeting star-forming galaxies with relatively blue in rest-frame UV. Thus, high redshift passive galaxies are almost fully missed in these surveys because they are very faint in the optical and usually there is no detectable emission line. In this respect, near-IR spectroscopy offers a great advantage for passive galaxies at z>1.4 as strongest spectral features such as 4000A break and Ca H+K absorption lines are redshifted into near-IR, and rest-frame optical continuum is much brighter than that in the rest-frame UV. By taking advantages of such nature of passive galaxies and the capability of multi-object spectroscopy of MOIRCS on Subaru, we have carried out near-IR spectroscopic observation of passively evolving galaxies at z>1.4. We have selected a sample of massive BzK-selected passively evolving galaxies (pBzKs) at z>1.4 from the COSMOS field and observed them with Subaru/MOIRCS. With a exposure time ranging from 7.5 hours to 9.5 hours per object, 18 pBzKs among 34 observed in 3 masks have been identified spectroscopically. I will show the results on their stellar populations based on broad-band SEDs and rest-frame optical spectral features, environments, and velocity dispersion analysis for the brightest object. I will also show average properties of z>1.4 passive galaxies based on a composite spectrum of identified pBzKs.

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

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