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Date and Time of the Query: 2018-12-17 T02:17:16 PST
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For refcode 2009ApJ...706..762W:
Retrieve 110 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
2009ApJ...706..762W Ly-{alpha}-Emitting Galaxies at Redshift z~ 4.5 in the LALA Cetus Field Wang, Jun-Xian; Malhotra, Sangeeta; Rhoads, James E.; Zhang, Hao-Tong; Finkelstein, Steven L. Abstract. We present a large sample of Ly-{alpha}-emitting galaxies (LAEs) spectroscopically confirmed at redshift z ~ 4.5, based on Inamori-Magellan Areal Camera and Spectrograph spectroscopic observations of candidate z~ 4.5 Ly-{alpha}-emitting galaxies in the large area Lyman {alpha} (LALA) narrowband imaging survey Cetus field. We identify 110 of them as z ~ 4.5 Ly-{alpha} emitters based on single-line detections with no continuum emission blueward of the line. Six foreground galaxies are identified, either based on multiple lines or blueward continuum emission. The Ly-{alpha} confirmation rate varies from <50% to 76% for candidates selected in different narrowband filters at slightly different redshifts. We find a drop in the LAE density at redshift 4.50 +/- 0.03 from redshift 4.39 to 4.47 by a factor of 66%, which could be a large-scale void in the distribution of star-forming galaxies (~18 Mpc along the line of sight and ~80 Mpc across). The sample includes many objects with equivalent widths (EWs) >~200 Angstrom. These large EW candidates are spectroscopically confirmed at the same rate as candidates with more modest EWs. A composite spectrum of all 110 confirmed LAEs shows the characteristic asymmetry of the Ly-{alpha} line. It also places new and stringent upper limits on the C IV 1549 Angstrom/Ly-{alpha} and He II 1640 Angstrom/Ly-{alpha} line ratios, providing a new upper limit on the fraction of active galactic nuclei in Ly-{alpha} selected galaxy samples, and on the contribution of Pop III populations. Finally, we calculate the Ly-{alpha} luminosity function for our z ~ 4.5 sample, which is consistent with those at other redshifts, showing that there is no evolution in Ly-{alpha} luminosity function from z = 3.1 to 6.6. Key words: cosmology: observations, early universe, galaxies: evolution, galaxies: formation, galaxies: high-redshift
Retrieve 110 NED objects in this reference.
Please click here for ADS abstract

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