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103 papers
A New Polar Ring Galaxy Discovered in the COSMOS Field
Minoru Nishimura, Kazuya Matsubayashi, Takashi Murayama +1
In order to understand the formation and evolution of galaxies fully, it is important to study their three-dimensional gravitational potential for a large sample of galaxies. Since…
X-ray Selected Narrow-Line Active Galactic Nuclei in the COSMOS Field: Nature of Optically Dull Active Galactic Nuclei
Itsna K. Fitriana, Takashi Murayama
X-ray emission detection in a galaxy is one of the efficient tools for selecting Active Galactic Nuclei (AGNs). However, many X-ray-selected AGNs are not easily selected as AGNs by…
ALMA band 8 observations of DLA2233+131 at z=3.150
Kazuyuki Ogura, Hideki Umehata, Yoshiaki Taniguchi +8
We present our ALMA Band 8 observations of a damped Ly absorption (DLA) system at =3.150 observed in the spectrum of the quasar Q2233+131 at =3.295. The optical counterpar…
Morphological Properties of Lyman Alpha Emitters at Redshift 4.86 in the COSMOS Field: Clumpy Star Formation or Merger?
Masakazu A. R. Kobayashi, Katsuhiro L. Murata, Anton M. Koekemoer +7
We investigate morphological properties of 61 Lyman-alpha emitters (LAEs) at z = 4.86 identified in the COSMOS field, based on Hubble Space Telescope Advanced Camera for Surveys (A…
The Subaru COSMOS 20: Subaru Optical Imaging of the HST COSMOS Field with 20 Filters
Y. Taniguchi, M. Kajisawa, M. A. R. Kobayashi +27
We present both the observations and the data reduction procedures of the Subaru COSMOS 20 project that is an optical imaging survey of the HST COSMOS field, carried out by using S…
A New Chemical Evolution Model for Dwarf Spheroidal Galaxies based on Observed Long Star Formation Histories
Hidetomo Homma, Takashi Murayama, Masakazu A. R. Kobayashi +1
We present a new chemical evolution model for dwarf spheroidal galaxies (dSphs) in the Local Universe. Our main aim is to explain both their observed star formation histories and m…