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J/ApJ/759/133 z=2.4 Lyalpha emitters in the 53W002 field (Mawatari+, 2012)
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Beginning of ReadMe :J/ApJ/759/133 z=2.4 Lyalpha emitters in the 53W002 field (Mawatari+, 2012)
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Characterization of the distribution of the Lyalpha emitters in the 53W002
field at z = 2.4.
Mawatari K., Yamada T., Nakamura Y., Hayashino T., Matsuda Y.
<Astrophys. J., 759, 133 (2012)>
=2012ApJ...759..133M
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ADC_Keywords: Redshifts ; Equivalent widths ; Galaxies, photometry
Keywords: cosmology: observations; galaxies: evolution; galaxies: formation;
large-scale structure of universe
Abstract:
We present the results of our wide-field narrowband imaging of the
field around the radio galaxy 53W002 at z=2.390 with
Subaru/Suprime-Cam. A custom-made filter, NB413, centered at 4140AA
with a width of 83AA is used to observe the 31'x24' area around the
radio galaxy. We detected 204 Lyalpha emitters (LAEs) at z=2.4 with
a rest-frame equivalent width larger than 25AA to the depth of 26 AB
mag (in NB413). The entire LAE population in the 53W002 field has an
average number density and distributions of equivalent width and size
that are similar to those of other fields at z 2. We identify a
significant high-density region (53W002F-HDR) that spreads over
approx5'x4' near 53W002, where the LAE number density is nearly four
times as large as the average of the entire field. Using the
probability distribution function of density fluctuation, we evaluate
the rareness probability of 53W002F-HDR to be 0.9^+2.4^_-0.62_%, which
corresponds to a moderately rich structure. No notable environmental
dependency at the comoving scale of 10Mpc is found for the
distributions of the Lyalpha equivalent width and luminosity in the
field. We also detected four Lyalpha blobs, one of which is newly
discovered. They are all located in the rims of high-density regions.
The biased location and unique morphologies in Lyalpha suggest that
galaxy interaction plays a key role in their formation.
Description:
In 2009 May 22-23 (UT), we carried out imaging observations of the
53W002 field, centered at RAJ2000=17:14:15.2,DEJ2000=50:15:49, using
the Suprime-Cam equipped on the 8.2m Subaru telescope. We used the
custom narrowband filter NB413, which has a central wavelength of
4140AA. We also used the B-band filter to estimate the continuum
flux.