PANORAMIC SURVEY OF Lyα EMITTERS AT z = 3.1

We present the results of the extensive narrowband survey of L gamma 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 b...

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Bibliographic Details
Published in:The Astronomical journal 2012-04, Vol.143 (4), p.1-14
Main Authors: Yamada, T, Nakamura, Y, Matsuda, Y, Hayashino, T, Yamauchi, R, Morimoto, N, KOUSAI, K, Umemura, M
Format: Article
Language:English
Subjects:
Blanks
Density
Emitters
Equivalence
Flux
Galaxies
High density
Narrowband
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Summary:We present the results of the extensive narrowband survey of L gamma 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 L gamma 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=1.8 10-17 erg s[sup -1] cm[sup -2] or the luminosity of = 1.5 1042 erg s[sup -1] at z = 3.1, above the observed equivalent-width threshold, = 190 A. 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 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 = 60 Mpc.
ISSN:0004-6256
1538-3881
DOI:10.1088/0004-6256/143/4/79