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Photometric Properties of Lyα Emitters at z ≈ 4.86 in the COSMOS 2 Square Degree Field

Shioya, Y. and Taniguchi, Y. and Sasaki, S. S. and Nagao, T. and Murayama, T. and Saito, T. and Ideue, Y. and Nakajima, A. and Matsuoka, K. and Trump, J. and Scoville, N. Z. and Sanders, D. B. and Mobasher, B. and Aussel, H. and Capak, P. and Kartaltepe, J. and Koekemoer, A. and Carilli, C. L. and Ellis, R. S. and Garilli, B. and Giavalisco, M. and Kitzbichler, M. G. and Impey, C. and Le Fèvre, O. and Schinnerer, E. and Smolčić, V. (2009) Photometric Properties of Lyα Emitters at z ≈ 4.86 in the COSMOS 2 Square Degree Field. Astrophysical Journal, 696 (1). pp. 546-561. ISSN 0004-637X. doi:10.1088/0004-637X/696/1/546.

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We present results of a survey for Lyα emitters at z ≈ 4.86 based on optical narrowband (λ_c = 7126 Å, Δλ = 73 Å) and broadband (B, V, r', i', and z') observations of the Cosmic Evolution Survey field using Suprime-Cam on the Subaru Telescope. We find 79 Lyα emitter (LAE) candidates at z ≈ 4.86 over a contiguous survey area of 1.83 deg^2, down to the Lyα line flux of 1.47 × 10^(–17) erg s^(-1) cm^(–2). We obtain the Lyα luminosity function with a best-fit Schechter parameters of log L* = 42.9^(+0.5)_(–0.3) erg s^(-1) and Ф* = 1.2^(+8.0)_(–1.1) × 10^(–4) Mpc^(-3) for α = –1.5 (fixed). The two-point correlation function for our LAE sample is ξ(r) = (r/4.4^(+5.7)_(–2.9) Mpc)^(–1.90±0.22). In order to investigate the field-to-field variations of the properties of Lyα emitters, we divide the survey area into nine tiles of 0°.5 × 0°.5 each. We find that the number density varies with a factor of ≃ 2 from field to field with high statistical significance. However, we find no significant field-to-field variance when we divide the field into four tiles with 0°.7 × 0°.7 each. We conclude that at least 0.5 deg^2 survey area is required to derive averaged properties of LAEs at z ~ 5, and our survey field is wide enough to overcome the cosmic variance.

Item Type:Article
Related URLs:
URLURL TypeDescription
Taniguchi, Y.0000-0003-2247-3741
Nagao, T.0000-0002-7402-5441
Matsuoka, K.0000-0002-2689-4634
Scoville, N. Z.0000-0002-0438-3323
Sanders, D. B.0000-0002-1233-9998
Aussel, H.0000-0002-1371-5705
Capak, P.0000-0003-3578-6843
Kartaltepe, J.0000-0001-9187-3605
Koekemoer, A.0000-0002-6610-2048
Carilli, C. L.0000-0001-6647-3861
Ellis, R. S.0000-0001-7782-7071
Giavalisco, M.0000-0002-7831-8751
Le Fèvre, O.0000-0001-5891-2596
Schinnerer, E.0000-0002-3933-7677
Smolčić, V.0000-0002-3893-8614
Additional Information:© 2009 The American Astronomical Society. Received 2008 August 8; accepted 2009 February 2; published 2009 April 16. The HST COSMOS Treasury program was supported through NASA grant HST-GO-09822. We greatly acknowledge the contributions of the entire COSMOS collaboration consisting of more than 70 scientists. We thank Masami Ouchi for useful discussion and the anonymous referee for valuable comments. We also thank the Subaru Telescope staff for their invaluable help. This work was financially supported in part by the JSPS (Nos. 15340059 and 17253001).
Group:COSMOS, Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)15340059
Japan Society for the Promotion of Science (JSPS)17253001
Subject Keywords:galaxies: distances and redshifts; galaxies: evolution; galaxies: luminosity function, mass function
Issue or Number:1
Record Number:CaltechAUTHORS:20090901-140022019
Persistent URL:
Official Citation:Photometric Properties of Lyα Emitters at z 4.86 in the COSMOS 2 Square Degree Field Y. Shioya, Y. Taniguchi, S. S. Sasaki, T. Nagao, T. Murayama, T. Saito, Y. Ideue, A. Nakajima, K. Matsuoka, J. Trump, N. Z. Scoville, D. B. Sanders, B. Mobasher, H. Aussel, P. Capak, J. Kartaltepe, A. Koekemoer, C. Carilli, R. S. Ellis, B. Garilli, M. Giavalisco, M. G. Kitzbichler, C. Impey, O. LeFevre, E. Schinnerer, and V. Smolcic 2009 ApJ 696 546-561 doi: 10.1088/0004-637X/696/1/546.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15531
Deposited By: Tony Diaz
Deposited On:14 Sep 2009 19:20
Last Modified:08 Nov 2021 23:20

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