A GRAVITATIONAL LENS MODEL FOR THE Ly{alpha} EMITTER LAE 221724+001716 AT z = 3.1 IN THE SSA 22 FIELD {sup ,}

Journal Article · Mon Apr 01 00:00:00 EDT 2013 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/766/2/122· OSTI ID:22167464

Nakahiro, Y.; Kajisawa, M.; Tanaka, A. R.; Hamada, K. ^[1]; Taniguchi, Y.; Shioya, Y.; Kobayashi, M. A. R. ^[2]; Inoue, A. K. ^[3]; Iwata, I. ^[4]; Matsuda, Y. ^[5]; Hayashino, T. ^[6]

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1. Graduate School of Science and Engineering, Ehime University, Bunkyo-cho 2-5, Matsuyama, Ehime 790-8577 (Japan)
2. Research Center for Space and Cosmic Evolution, Ehime University, Bunkyo-cho 2-5, Matsuyama, Ehime 790-8577 (Japan)
3. College of General Education, Osaka Sangyo University, 3-1-1 Nakagaito, Daito, Osaka 574-8530 (Japan)
4. Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720 (United States)
5. ALMA Office, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan)
6. Research Center for Neutrino Science, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578 (Japan)

During the course of our Lyman continuum imaging survey, we found that the spectroscopically confirmed Ly{alpha} emitter LAE 221724+001716 at z = 3.10 in the SSA 22 field shows strong Lyman continuum emission ({lambda}{sub rest} {approx} 900 A) 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 {lambda}{sub obs} Almost-Equal-To 3360 A is Ly{alpha}. If this is the case, as the angular separation between these two galaxies is very small ( Almost-Equal-To 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{sub *} {approx} 3.5 Multiplication-Sign 10{sup 9} M{sub Sun} from its UV luminosity and {approx}3.0 Multiplication-Sign 10{sup 7}-2.4 Multiplication-Sign 10{sup 9} M{sub Sun} 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.

• OSTI ID: 22167464
• Journal Information: Astrophysical Journal, Vol. 766, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COSMOLOGY
EMISSION
ENERGY SPECTRA
GALAXIES
GRAVITATIONAL LENSES
LUMINOSITY
LYMAN LINES
MASS
RED SHIFT
SPHERES