A gravitational lens model for the Lyα emitter Lae 221724+001716 at z = 3.1 in the SSA 22 field

Y. Nakahiro*, Y. Taniguchi, A. K. Inoue, Y. Shioya, M. Kajisawa, M. A.R. Kobayashi, I. Iwata, Y. Matsuda, T. Hayashino, A. R. Tanaka, K. Hamada

*この研究の対応する著者

研究成果: Article査読

1 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号122
ジャーナルAstrophysical Journal
766
2
DOI
出版ステータスPublished - 2013 4月 1
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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