J/ApJ/696/546 Ly{alpha} emitters at z~4.86 (Shioya+, 2009) ================================================================================ Photometric properties of Ly{alpha} emitters at z~4.86 in the COSMOS 2 square degree field. Shioya Y., Taniguchi Y., Sasaki S.S., Nagao T., Murayama T., Saito T., Ideue Y., Nakajima A., Matsuoka K., Trump J., Scoville N.Z., Sanders D.B., Mobasher B., Aussel H., Capak P., Kartaltepe J., Koekemoer A., Carilli C., Ellis R.S., Garilli B., Giavalisco M., Kitzbichler M.G., Impey C., Lefevre O., Schinnerer E., Smolcic V. =2009ApJ...696..546S ================================================================================ ADC_Keywords: Galaxies, optical ; Ultraviolet ; Photometry, ugriz Keywords: galaxies: distances and redshifts - galaxies: evolution - galaxies: luminosity function, mass function Abstract: We present results of a survey for Ly{alpha} emitters at z~4.86 based on optical narrowband ({lambda}c=7126{AA}, {Delta}{lambda}=73{AA}) 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 Ly{alpha} emitter (LAE) candidates at z~4.86 over a contiguous survey area of 1.83deg^2^, down to the Ly{alpha} line flux of 1.47x10^-17^erg/s/cm^2^. We obtain the Ly{alpha} luminosity function with a best-fit Schechter parameters of log L*=42.9^+0.5^_-0.3_erg/s and {Phi}*=1.2^+8.0^_-1.1_x10^-4^Mpc^-3^ for {alpha}=-1.5 (fixed). The two-point correlation function for our LAE sample is {xi}(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 Ly{alpha} emitters, we divide the survey area into nine tiles of 0.5x0.5{deg} 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 0.7x0.7{deg} each. We conclude that at least 0.5deg^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. Description: We carried out an optical narrowband (NB711; {lambda}c=7126+/-73{AA}) imaging survey of the entire 2deg^2^ area of the COSMOS field, using the Suprime-Cam on the Subaru Telescope in 2006 February. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 77 79 Photometric properties of Ly{alpha} emitter (LAE) candidates -------------------------------------------------------------------------------- See also: J/A+A/498/13 : Lyman-{alpha} emitters from redshifts z~2-3 (Nilsson+, 2009) J/ApJS/175/128 : H{alpha} emitting galaxies in COSMOS-2 field (Shioya+, 2008) J/ApJS/172/456 : [OII] emitting galaxies in COSMOS + SDF fields (Takahashi+, 2007) J/ApJS/172/523 : COSMOS field Ly{alpha} emitters at z~5.7 (Murayama+, 2007) J/PASJ/58/313 : Ly{alpha} emitters in the SUBARU Deep Field (Shimasaku+, 2006) J/ApJ/648/7 : Ly{alpha} emitters at z=6.5 in Subaru Deep Field (Kashikawa+, 2006) J/PASJ/57/165 : Ly{alpha} emitters in the SUBARU Deep Field (Taniguchi+, 2005) J/PASJ/57/881 : Imaging of high-redshift Lyman alpha emitters (Yamada+, 2005) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Seq Object number (<[STS2009] NN> in Simbad) 4- 12 F9.5 deg RAdeg Right ascension in decimal degrees (J2000) 14- 21 F8.6 deg DEdeg Declination in decimal degrees (J2000) 23- 27 F5.2 mag r'mag ?=99 Subaru r'-band AB magnitude 29- 33 F5.2 mag i'mag Subaru i'-band AB magnitude 35- 39 F5.2 mag rimag Subaru ri-band AB magnitude (1) 41- 45 F5.2 mag NB711 Subaru NB711-band AB magnitude (1) 47 A1 --- l_z'mag Limit flag on z'mag 48- 52 F5.2 mag z'mag Subaru z'-band AB magnitude 54- 58 F5.2 [10-7W] logL(Lya) Log of Ly{alpha} luminosity 60 A1 --- l_logLnu Limit flag on logLnu 61- 65 F5.2 [10-7W/Hz] logLnu Log of luminosity at 1540{AA} in erg/s/Hz 67 A1 --- l_UVMag Limit flag on UVMag 68- 72 F5.1 mag UVMag Absolute UV-band AB magnitude at rest-frame 1540{AA} 74 A1 --- l_EW0 Limit flag on EW0 75- 77 I3 0.1nm EW0 Equivalent width (EW_0_) (2) ------------------------------------------------------------------------------- Note (1): NB711 is the optical narrowband defined as {lambda}c=7126+/-73{AA}. Since the effective frequency of the NB711 filter (421.1THz) lies between r' (482.8THz) and i' (394.0THz) bands, we estimate the frequency-matched continuum, "ri continuum," using the linear combination: f_ri_=0.3f_r'_+0.7f_i'_, where f_r'_ and f_i'_ are the flux densities in r' and i' bands, respectively. See section 2.2 for further details. Note (2): As indicated in the erratum (2009, ApJ, 700, 899), EW_0_ values of table 1 in the original paper have been multiplied by 0.83 at CDS. -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Emmanuelle Perret [CDS] 06-May-2011