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J/A+A/498/13    Lyman-α emitters from redshifts z∼2-3     (Nilsson+, 2009)

Evolution in the properties of Lyman-α emitters from redshifts z∼3 to z∼2. Nilsson K.K., Tapken C., Moller P., Freudling W., Fynbo J.P.U., Meisenheimer K., Laursen P., Oestlin G. <Astron. Astrophys., 498, 13-23 (2009)> =2009A&A...498...13N
ADC_Keywords: Surveys ; Photometry ; Redshifts ; Equivalent widths ; Ultraviolet Keywords: cosmology: observations - galaxies: high redshift Abstract: Narrow-band surveys to detect Lyα emitters are powerful tools for identifying high, and very high, redshift galaxies. Although samples are increasing at redshifts z=3-6, the nature of these galaxies is still poorly known. The number of galaxies detected at redshifts below z∼3 are also small. We study the properties of z=2.25 Lyα emitters and compare them with those of z>3 Lyα emitters We present narrow-band imaging made with the MPG/ESO 2.2m telescope and the WFI (Wide Field Imager) detector. Using this data, we have searched for emission-line objects. We find 170 candidate typical Lyα emitters and 17 candidates that we regard as high UV-transmission Lyα emitters. We have derived the magnitudes of these objects in 8 photometric bands from u* to Ks, and studied whether they have X-ray and/or radio counterparts. Description: In March 2007, a 35x34arcmin2 section of the COSMOS field, centred on 10:00:27+02:12:22.7 (J2000), was observed with the Wide-Field Imager (WFI) on the MPG/ESO 2.2m telescope on La Silla. The 386 candidates were split into the different categories of [Likely, Unlikely, Rejected] = [187, 61, 138]. In Table 2, we list the coordinates, EWs, significance of the EWs, continuum-subtracted narrow-band magnitudes mag3960 and mean UV spectral index beta of all likely candidates. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 58 187 Coordinates, observed equivalent widths, continuum subtracted narrow-band magnitudes and UV spectral index β of the likely candidates
See also: J/PASJ/57/165 : Lyα 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: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [NTM2009] LAE-COSMOS sequential number, [NTM2009] LAE-COSMOS NNN in Simbad 5- 13 F9.5 deg RAdeg Right ascension in decimal degrees (J2000) 15- 21 F7.5 deg DEdeg Declination in decimal degrees (J2000) 23- 28 F6.1 0.1nm EW Lymanα equivalent width 30- 34 F5.1 0.1nm e_EW rms uncertainty on EW 36- 40 F5.2 mag m3960 Continuum subtracted narrow-band magnitude at 396nm 42- 45 F4.2 mag e_m3960 rms uncertainty on m3960 47- 51 F5.2 --- beta ?=- UV spectral index beta (1) 53- 56 F4.2 --- e_beta ?=- rms uncertainty on beta 58 A1 --- Note [G] G for candidates detected with GALEX
Note (1): the UV spectral index β is defined such that F(λ) ∝ λβ (see section 4.1 of the paper)
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 18-Jan-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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