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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…