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The origin of color gradients in elliptical galaxies is examined by comparing model gradients with those observed in the Hubble Deep Field. The models are constructed so as to reproduce color gradients in local elliptical galaxies either by a metallicity gradient or by an age gradient. By looking back a sequence of color gradient as a function of redshift,(More)
We present the results of a deep, wide-area, optical and near-IR survey of massive high-redshift galaxies. The Prime Focus Camera (Suprime-Cam) on the Subaru telescope was used to obtain BRIz ′ imaging over 2 × 940 arcmin 2 fields, while JK s imaging was provided by the SOFI camera at the New Technology Telescope (NTT) for a subset of the area, partly from(More)
Observations and theoretical simulations have established a framework for galaxy formation and evolution in the young Universe. Galaxies formed as baryonic gas cooled at the centres of collapsing dark-matter haloes; mergers of haloes and galaxies then led to the hierarchical build-up of galaxy mass. It remains unclear, however, over what timescales galaxies(More)
We discuss the environmental dependence of galaxy evolution based on deep panoramic imaging of two distant clusters, RXJ0152.7−1257 at z = 0.83 and CL0016+1609 at z = 0.55, taken with Suprime-Cam on the Subaru Telescope as part of the PISCES project. By combining with the SDSS data as a local counterpart for comparison, we construct a large sample of(More)
Aims. As part of the DART project we have used the ESO/2.2m Wide Field Imager in conjunction with the VLT/FLAMES ⋆ GIRAFFE spec-trograph to study the detailed properties of the resolved stellar population of the Fornax dwarf spheroidal galaxy out to and beyond its tidal radius. Fornax dSph has had a complicated evolution and contains significant numbers of(More)
AKARI (formerly ASTRO-F) is an infrared space telescope designed for an all-sky survey at 10-180 µm, and deep pointed surveys of selected areas at 2-180 µm. The deep pointed surveys with AKARI will significantly advance our understanding of galaxy evolution, the structure formation of the Universe, the nature of the buried AGNs, and the cosmic infrared(More)
We study the chemical and kinematic properties of the first galaxies which formed at a high red-shift, using high resolution cosmological numerical simulations, and compared them with the recent observational results for the Sculptor dwarf spheroidal galaxy by Tolstoy et al., who found two distinct stellar populations: the lower metallicity stars are more(More)
We present deep, sub-horizontal branch, multi-colour photometry of the Andromeda II dwarf spheroidal (And II dSph) taken with the Subaru Suprime-Cam wide field camera. We identify a red clump population in this galaxy, the first time this feature has been detected in a M31 dSph, which are normally characterized as having no significant intermediate age(More)
We present a discovery of definitive large-scale structures around RXJ0152.7–1352 at z = 0.83 based on spectroscopic redshifts. In our previous papers, we reported a photo-metric identification of the large-scale structures at z ∼ 0.8. A spectroscopic follow-up observation was carried out on 8 selected regions covering the most prominent structures to(More)