Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21941104c&link_type=abstract
American Astronomical Society, AAS Meeting #219, #411.04
Other
Scientific paper
Interacting galaxies are thought to be the essential building blocks of elliptical galaxies under the hierarchical galaxy formation scenario. The goal of my dissertation is to broaden our understanding of galaxy merger evolution through both observational studies and instrumentation development. Observationally, photometric studies conducted in this dissertation better constrain wet and dry merger density evolution up to z 1 using the five CFHTLS broad band photometry. I have discovered that the most massive ellipticals may not be formed via merging processes, unless the merging timescale is much longer than the expected value. Spectroscopically, kinematic study of close pair galaxies shows that red close pairs tend to live in more massive galactic haloes, which supports the gravitational star formation quenching mechanism proposed by the hot halo model. Further constraining the details of galactic color transformations requires careful analyses of 2D spectra from integral-field spectroscopy with wide field of views, which can provide uniform 2D spectroscopic information of merging galaxies.
However, the currently available near-infrared integral field spectrographs cannot provide both wide field of view and high spectral resolution. Thus, I undertook the optical design of a wide integral field infrared spectrograph (WIFIS) that can provide an unprecedented 5" x 12" field of view on a 10-m class telescope. This WIFIS design has a high spectral resolution of 5000, covering each of J, H, Ks band in a single exposure, and is optimized for studying mergers at redshift z => 1. In addition to this design, to study mergers at relatively low redshifts of z = 0.4 to 1, I also developed another optical design of WIFIS covering shorter wavelengths of z,J,H bands. I am presently working on the alignment and characterization of WIFIS in order to have first light in Fall 2012.
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