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Environmental Effects on the Star Formation Activity at z~0.9 in the COSMOS Field
M. Kajisawa, Y. Shioya, Y. Aida +6
We investigated the fraction of [OII] emitters in galaxies at z~0.9 as a function of the local galaxy density in the Hubble Space Telescope (HST) COSMOS 2 square degree field. [OII…
A Gravitational Lens Model for the Lya Emitter, LAE 221724+001716 at z=3.1 in the SSA 22 Field
Y. Nakahiro, Y. Taniguchi, A. K. Inoue +8
During the course of our Lyman continuum imaging survey, we found that the spectroscopically confirmed Lya emitter LAE 221724+001716 at z = 3.10 in the SSA 22 field shows strong Ly…
A Ly-alpha Emitter with an Extremely Large Rest-frame Equivalent Width of ~900A at z=6.5: A Candidate of Population III-dominated Galaxy?
Nobunari Kashikawa, Tohru Nagao, Jun Toshikawa +13
We have identified a very interesting Ly-alpha emitter, whose Ly-alpha emission line has an extremely large observed equivalent width of EW_0=436^{+422}_{-149}A, which corresponds…
Constraints on the faint end of the quasar luminosity function at z~5 in the COSMOS field
H. Ikeda, T. Nagao, K. Matsuoka +12
We present the result of our low-luminosity quasar survey in the redshift range of 4.5 < z < 5.5 in the COSMOS field. Using the COSMOS photometric catalog, we selected 15 quasar ca…
Post-starburst Tidal Tails in the Archetypical Ultra Luminous Infrared Galaxy Arp 220
Y. Taniguchi, K. Matsubayashi, M. Kajisawa +6
We present our new deep optical imaging and long-slit spectroscopy for Arp 220 that is the archetypical ULIRG in the local universe. Our sensitive Ha imaging has newly revealed lar…
Photo-z Performance for Precision Cosmology II : Empirical Verification
R. Bordoloi, S. J. Lilly, A. Amara +8
The success of future large scale weak lensing surveys will critically depend on the accurate estimation of photometric redshifts of very large samples of galaxies. This in turn de…
The Role of Galaxy Interaction in Environmental Dependence of the Star Formation Activity at z~1.2
Yuko Ideue, Yoshiaki Taniguchi, Tohru Nagao +9
In order to understand environmental effects on star formation in high-redshift galaxies, we investigate the physical relationships between the star formation activity, stellar mas…
Completing the Census of Ly-alpha Emitters at the Reionization Epoch
Nobunari Kashikawa, Kazuhiro Shimasaku, Yuichi Matsuda +16
We carried out extended spectroscopic confirmations of Ly-alpha emitters (LAEs) at z=6.5 and 5.7 in the Subaru Deep Field. Now, the total number of spectroscopically confirmed LAEs…
Probing the faint end of the quasar luminosity function at z ~ 4 in the COSMOS field
H. Ikeda, T. Nagao, K. Matsuoka +16
We searched for quasars that are ~ 3 mag fainter than the SDSS quasars in the redshift range 3.7 < z < 4.7 in the COSMOS field to constrain the faint end of the quasar luminosity f…
Low-Metallicity Star Formation in High-Redshift Galaxies at z~8
Y. Taniguchi, Y. Shioya, J. R. Trump
Based on the recent very deep near-infrared imaging of the Hubble Ultra Deep Field with WFC3 on the Hubble Space Telescope, five groups published most probable samples of galaxies…
The Nature of Optically Dull Active Galactic Nuclei in COSMOS
Jonathan R. Trump, Chris D. Impey, Yoshi Taniguchi +17
We present infrared, optical, and X-ray data of 48 X-ray bright, optically dull AGNs in the COSMOS field. These objects exhibit the X-ray luminosity of an active galactic nucleus (…
Spectroscopy of luminous z>7 galaxy candidates and sources of contamination in z>7 galaxy searches
P. Capak, B. Mobasher, N. Z. Scoville +22
We present three bright z+ dropout candidates selected from deep Near-Infrared (NIR) imaging of the COSMOS 2 square degree field. All three objects match the 0.8-8um colors of othe…
HST/ACS Morphology of Lyman Alpha Emitters at Redshift 5.7 in the COSMOS Field
Y. Taniguchi, T. Murayama, N. Z. Scoville +28
We present detailed morphological properties of Lyman alpha emitters (LAEs) at z~ 5.7 in the COSMOS field, based on {\it Hubble Space Telescope} Advanced Camera for Surveys (ACS) d…
Environmental Effects on the Star Formation Activity in Galaxies at z=1.2 in the COSMOS Field
Y. Ideue, T. Nagao, Y. Taniguchi +14
We investigate the relation between the star-formation activity in galaxies and environment at z=1.2 in the COSMOS field, using the fraction of [OII] emitters and the local galaxy…
Photometric properties of Ly alpha emitters at z=4.86 in the COSMOS 2 square degree field
Y. Shioya, Y. Taniguchi, S. S. Sasaki +23
We present results of a survey for Ly alpha emitters at z=4.86 based on optical narrowband (lambda_c=7126 angstrom, Delta lambda=73 angstrom) and broadband (B, V, r', i', and z') o…