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J/ApJ/744/110        LAE galaxies between 2.1=<z≤3.1        (Ciardullo+, 2012)

The evolution of lyα-emitting galaxies between z = 2.1 and z = 3.1. Ciardullo R., Gronwall C., Wolf C., McCathran E., Bond N.A., Gawiser E., Guaita L., Feldmeier J.J., Treister E., Padilla N., Francke H., Matkovic A., Altmann M., Herrera D. <Astrophys. J., 744, 110 (2012)> =2012ApJ...744..110C
ADC_Keywords: Galaxies, optical ; Equivalent widths ; Redshifts Keywords: cosmology: observations - galaxies: formation - galaxies: high-redshift - galaxies: luminosity function, mass function Abstract: We describe the results of a new, wide-field survey for z=3.1 Lyα emitters (LAEs) in the Extended Chandra Deep Field South (ECDF-S). By using a nearly top-hat 5010Å filter and complementary broadband photometry from the MUSYC survey, we identify a complete sample of 141 objects with monochromatic fluxes brighter than 2.4x10-17erg/cm2/s and observers-frame equivalent widths (EWs) greater than ∼80Å (i.e., 20Å in the rest frame of Lyα). The bright end of this data set is dominated by X-ray sources and foreground objects with Galaxy Evolution Explorer detections, but when these interlopers are removed, we are still left with a sample of 130 LAE candidates, 39 of which have spectroscopic confirmations. This sample overlaps the set of objects found in an earlier ECDF-S survey, but due to our filter's redder bandpass, it also includes 68 previously uncataloged sources. We confirm earlier measurements of the z=3.1 LAE emission-line luminosity function and show that an apparent anticorrelation between EW and continuum brightness is likely due to the effect of correlated errors in our heteroskedastic data set. Finally, we compare the properties of z=3.1 LAEs to LAEs found at z=2.1. We show that in the ∼1Gyr after z∼3, the LAE luminosity function evolved significantly, with L* fading by ∼0.4mag, the number density of sources with L>1.5x1042erg/s declining by ∼50%, and the EW scale length contracting from 70+7-5Å to 50+9-6Å. When combined with literature results, our observations demonstrate that over the redshift range z∼0 to z∼4, LAEs contain less than ∼10% of the star formation rate density of the universe. Description: We extended the Gr07 (Gronwall et al. 2007, Cat. J/ApJ/667/79) study by re-imaging the ECDF-S, this time with a 57Å full width at half-maximum (FWHM) nearly top-hat filter centered near 5010Å. As with Gr07, the data were collected with the MOSAIC II CCD camera on the CTIO Blanco 4m telescope and consisted of a set of 47 images obtained in 2006 Oct 15,17,19 and Nov 20,22. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 87 141 Candidate Lyα emitters: the statistically complete sample table3.dat 87 58 Candidate Lyα emitters: objects below the completeness limit
See also: II/261 : GOODS initial results (Giavalisco+, 2004) J/ApJ/743/9 : z=3.1 LAEs morphological properties (Gronwall+, 2011) J/ApJ/736/31 : HETDEX pilot survey. II. 1.9<z<3.8 LAEs (Blanc+, 2011) J/ApJ/725/394 : High-redshift Lyα emitters (Hu+, 2010) J/ApJ/711/928 : Low-redshift Lyα galaxies from GALEX (Cowie+, 2010) J/A+A/512/A12 : VLT/VIMOS spectroscopy in GOODS-South field (Balestra+, 2010) J/ApJ/696/546 : Lyα emitters at z∼4.86 (Shioya+, 2009) J/A+A/498/13 : Lyman-α emitters from redshifts z∼2-3 (Nilsson+, 2009) J/ApJS/176/301 : Subaru/XMM-Newton deep survey IV. (SXDS) (Ouchi+, 2008) J/ApJ/680/1072 : Lyα-emitting galaxies at 0.2<z<0.35 (Deharveng+, 2008) J/A+A/478/83 : GOODS-South Field VLT/FORS2 redshifts. III. (Vanzella+, 2008) J/ApJ/667/79 : Lyα emission-line galaxies at z=3.1 (Gronwall+, 2007) J/A+A/461/823 : Candidate Lyα emitting galaxies (Venemans+, 2007) J/ApJS/162/1 : MUSYC: optical source catalog (Gawiser+, 2006) J/ApJ/642/L13 : ECDFS MUSYC galaxies UBVRIzNB5000 photometry (Gawiser+, 2006) J/ApJS/161/21 : Extended Chandra Deep Field-South survey (Lehmer+, 2005) Byte-by-byte Description of file: table[23].dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq [1/199] Running sequence number 5 I1 h RAh [3] Hour of Right Ascension (J2000) 7- 8 I2 min RAm [31/33] Minute of Right Ascension (J2000) 10- 14 F5.2 s RAs Second of Right Ascension (J2000) 16 A1 --- DE- [-] Sign of the Declination (J2000) 17- 18 I2 deg DEd [27/28] Degree of Declination (J2000) 20- 21 I2 arcmin DEm Arcminute of Declination (J2000) 23- 26 F4.1 arcsec DEs Arcsecond of Declination (J2000) 28- 34 F7.3 [mW/m2] logF501 [-17.143/-15.227] Log flux in 5010Å filter (in erg/s/cm2) 36- 39 I4 0.1nm EW [82/2575] Observed equivalent width; in Å 41- 45 F5.3 --- z [0.33/3.2]? Redshift 47- 87 A41 --- Com Additional comments (1)
Note (1): G-XXX denotes identification number in Gronwall et al. (2007, Cat. J/ApJ/667/79; <[GCH2007] NNN> in Simbad).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 18-Jun-2013
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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