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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Article number122
JournalAstrophysical Journal
Volume766
Issue number2
DOIs
Publication statusPublished - 2013 Apr 1
Externally publishedYes

Keywords

  • cosmology: observations
  • galaxies: high-redshift
  • gravitational lensing: strong

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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