PANORAMIC SURVEY OF Ly{alpha} EMITTERS AT z = 3.1

Journal Article · Sun Apr 15 04:00:00 EDT 2012 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/143/4/79· OSTI ID:22034678

Yamada, T; Nakamura, Y; Morimoto, N ^[1]; Matsuda, Y ^[2]; Hayashino, T; Yamauchi, R; Kousai, K ^[3]; Umemura, M ^[4]

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1. Astronomical Institute, Tohoku University, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578 (Japan)
2. Department of Physics, Durham University, South Road, Durham DH1 3LE (United Kingdom)
3. Research Center for Neutrino Science, Graduate School of Science, Tohoku University, Sendai 980-8578 (Japan)
4. Center for Computational Physics, University of Tsukuba, Tsukuba, Ibaraki 305 (Japan)

We present the results of the extensive narrowband survey of Ly{alpha} emission-line objects at z = 3.1 in the 1.38 deg{sup 2} area surrounding the high-density region of star-forming galaxies at z = 3.09 in the SSA22 field, as well as in the 1.04 deg{sup 2} area of the three separated general blank fields. In total, of 2161 Ly{alpha} emitters, there are 1394 in the SSA22 fields and 767 in the general fields detected at the narrowband AB magnitude limit of 25.73, which corresponds to the line flux of Almost-Equal-To 1.8 Multiplication-Sign 10{sup -17} erg s{sup -1} cm{sup -2} or the luminosity of Almost-Equal-To 1.5 Multiplication-Sign 10{sup 42} erg s{sup -1} at z = 3.1, above the observed equivalent-width threshold, Almost-Equal-To 190 A. The average surface number density of the emitters at z = 3.1 in the general fields above the thresholds is 0.20 {+-} 0.01 arcmin{sup -2}. The SSA22 high-density region at z = 3.09, whose peak local density is six times that of the average, is found to be the most prominent outstanding structure in the whole surveyed area and is firmly identified as a robust 'protocluster'. We also compared the overdensity of the 100 arcmin{sup 2} and 700 arcmin{sup 2} areas which contain the protocluster with the expected fluctuation of the dark matter as well as those of the model galaxies in cosmological simulations. We found that the peak height values of the overdensity are 8-10 and 3-4 times the expected standard deviations for the counts of Ly{alpha} emitters at z = 3.1 in the corresponding volume, respectively. We conclude that the structure at z = 3.09 in the SSA22 field is a very significant and rare density peak up to the scale of Almost-Equal-To 60 Mpc.

• OSTI ID: 22034678
• Journal Information: Astronomical Journal (New York, N.Y. Online), Journal Name: Astronomical Journal (New York, N.Y. Online) Journal Issue: 4 Vol. 143; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ASTRONOMY
ASTROPHYSICS
COMPUTERIZED SIMULATION
COSMOLOGY
DENSITY
FLUCTUATIONS
GALACTIC EVOLUTION
GALAXIES
GALAXY CLUSTERS
LINE WIDTHS
LUMINOSITY
LYMAN LINES
NONLUMINOUS MATTER
PHOTON EMISSION
RED SHIFT
STARS
UNIVERSE