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PANORAMIC VIEWS OF GALAXY CLUSTER EVOLUTION: GALAXY ECOLOGY
Kodama, Tadayuki,Koyama, Yusei,Hayashi, Masao,Ken-ichi, Tadaki The Korean Astronomical Society 2010 天文學論叢 Vol.25 No.3
Taking the great advantage of Subaru's wide field coverage both in the optical and in the near infrared, we have been providing panoramic views of distant clusters and their surrounding environments over the wide redshift range of 0:4 < z < 3. From our unique data sets, a consistent picture has been emerging that the star forming activity is once enhanced and then truncated in galaxy groups in the outskirts of clusters during the course of cluster assembly at z < 1. Such activity is shifted into cluster cores as we go further back in time to z ~ 1.5. At z = 2 - 2.5, we begin to enter the epoch when massive galaxies are actually forming in the cluster core. And by z ~ 3, we eventually go beyond the major epoch of massive galaxy formation. It is likely that the environmental dependence of star forming activity is at least partly due to the external environmental effects such as galaxy-galaxy interaction in medium density regions at z < 1, while the intrinsic effect of galaxy formation bias overtakes the external effect at higher redshifts, resulting in a large star formation activity in the cluster center.
Hideo Itozaki,Tadayuki Hayashi 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.5I
A SQUID microscope has been developed to observe fine magnetic fields. A fine needle and a sample vibration method were effective to improve its spatial resolution. The fine needle with a chip diameter of less than a micrometer worked to collect magnetic fluxes at the limited area near the top of the needle chip and showed micrometer spatial resolution of the magnetic field. The sample vibration method was effective for observing static fields, because vibrations modulate a magnetic field and a lock-in amplifier can be used to reduce noises. A finely focused laser was useful for inspecting a solar cell by using the SQUID, because the SQUID could detect the magnetic field of the current induced by the laser. This technique was applied to evaluate the current distribution in a solar cell and to observe a clear grain image in a polycrystalline solar cell.