J/A+A/461/823       Candidate Lyalpha emitting galaxies     (Venemans+, 2007)
The following files can be converted to FITS (extension .fit .fgz or .fiZ)
	table1.dat tablea?.dat
Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/A+A/461/823

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Beginning of ReadMe : J/A+A/461/823 Candidate Lyalpha emitting galaxies (Venemans+, 2007) ================================================================================ Protoclusters associated with z > 2 radio galaxies. I. Characteristics of high redshift protoclusters. Venemans B.P., Roettgering H.J.A., Miley G.K., van Breugel W.J.M., De Breuck C., Kurk J.D., Pentericci L., Stanford S.A., Overzier R.A., Croft S., Ford H. <Astron. Astrophys., 461, 823-845 (2007)> =2007A&A...461..823V ================================================================================ ADC_Keywords: Galaxies, radio ; Active gal. nuclei ; Redshifts Keywords: galaxies: active - galaxies: clusters: general - cosmology: observations - cosmology: early Universe - cosmology: large scale structure of Universe Abstract: We present the results of a large program conducted with the Very Large Telescope and augmented by observations with the Keck telescope to search for forming clusters of galaxies near powerful radio galaxies at 2.0<z<5.2. Besides MRC 1138-262 at z=2.16, the radio galaxy observed in our pilot program, we obtained narrow- and broad-band images of eight radio galaxies and their surroundings. The imaging was used to select candidate Lyalpha emitting galaxies in  3x3Mpc^2^ areas near the radio galaxies. A total of 300 candidate emitters were found with a rest-frame Lyalpha equivalent width of EW0>15AA and significance Sigmaequiv.to(EW0/DEW0)>3. Follow-up spectroscopy was performed on 152 candidates in seven of the radio galaxy fields. Of these, 139 were confirmed to be Lyalpha emitters, four were low redshift interlopers and nine were non-detections. With the adopted criteria the success rate is 139/152=91%. In addition, 14 objects with EW0<15 and/or Sigma<3 were confirmed to be Lyalpha emitters. Combined with the 15 Lyalpha emitters near MRC 1138-262, we have determined Lyalpha redshifts for 168 objects near eight radio galaxies. Description: All the narrow-band imaging and most of the broad-band imaging obtained in the large program were performed with the FOcal Reducer/low dispersion Spectrograph 2 (FORS2) in imaging mode between 2001 Mar 24 and 2002 Sep 08. Additional (broad-band) imaging was obtained using the Low Resolution Imaging Spectrometer (LRIS) on the Keck I telescope between 2003 Jan 31 and 2004 Jan 19.