TY - JOUR
T1 - A gravitational lens model for the Lyα emitter Lae 221724+001716 at z = 3.1 in the SSA 22 field
AU - Nakahiro, Y.
AU - Taniguchi, Y.
AU - Inoue, A. K.
AU - Shioya, Y.
AU - Kajisawa, M.
AU - Kobayashi, M. A.R.
AU - Iwata, I.
AU - Matsuda, Y.
AU - Hayashino, T.
AU - Tanaka, A. R.
AU - Hamada, K.
PY - 2013/4/1
Y1 - 2013/4/1
N2 - During the course of our Lyman continuum imaging survey, we found that the spectroscopically confirmed Lyα emitter LAE 221724+001716 at z = 3.10 in the SSA 22 field shows strong Lyman continuum emission (λrest ∼ 900 Å) that escapes from this galaxy. However, another recent spectroscopic survey revealed that the supposed Lyman continuum emission could arise from a foreground galaxy at z = 1.76 if the emission line newly detected from the galaxy at λobs ≈ 3360 Å is Lyα. If this is the case, as the angular separation between these two galaxies is very small (≈0.″6), LAE 221724+001716 at z = 3.10 could be amplified by the gravitational lensing caused by this intervening galaxy. Here we present a possible gravitational lens model for the system of LAE 221724+001716. First, we estimate the stellar mass of the intervening galaxy as M ⊙* ∼ 3.5 × 109 M⊙ from its UV luminosity and ∼3.0 × 107-2.4 × 10 9 M⊙ through the spectral energy distribution fitting. Then, we find that the gravitational magnification factor ranges from 1.01 to 1.16 using the so-called singular isothermal sphere model for strong lensing. While LAE 221724+001716 is the first system of an LAE-LAE lensing reported so far, the estimated magnification factor is not so significant because the stellar mass of the intervening galaxy is small.
AB - During the course of our Lyman continuum imaging survey, we found that the spectroscopically confirmed Lyα emitter LAE 221724+001716 at z = 3.10 in the SSA 22 field shows strong Lyman continuum emission (λrest ∼ 900 Å) that escapes from this galaxy. However, another recent spectroscopic survey revealed that the supposed Lyman continuum emission could arise from a foreground galaxy at z = 1.76 if the emission line newly detected from the galaxy at λobs ≈ 3360 Å is Lyα. If this is the case, as the angular separation between these two galaxies is very small (≈0.″6), LAE 221724+001716 at z = 3.10 could be amplified by the gravitational lensing caused by this intervening galaxy. Here we present a possible gravitational lens model for the system of LAE 221724+001716. First, we estimate the stellar mass of the intervening galaxy as M ⊙* ∼ 3.5 × 109 M⊙ from its UV luminosity and ∼3.0 × 107-2.4 × 10 9 M⊙ through the spectral energy distribution fitting. Then, we find that the gravitational magnification factor ranges from 1.01 to 1.16 using the so-called singular isothermal sphere model for strong lensing. While LAE 221724+001716 is the first system of an LAE-LAE lensing reported so far, the estimated magnification factor is not so significant because the stellar mass of the intervening galaxy is small.
KW - cosmology: observations
KW - galaxies: high-redshift
KW - gravitational lensing: strong
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U2 - 10.1088/0004-637X/766/2/122
DO - 10.1088/0004-637X/766/2/122
M3 - Article
AN - SCOPUS:84875429723
SN - 0004-637X
VL - 766
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 122
ER -