Space Warps Talk

Lens system 2MASX J01414232-0735281

  • Ghost_Sheep_SWR by Ghost_Sheep_SWR

    This post is a copy-paste from GalaxZoo as suggested by Budgieye Discussion:

    Official lens system 2MASX J01414232-0735281 (SNL-2 in paper), can you spot it? 😄

    Central galaxy at z = 0.051 and lensed galaxy at z = 1.97

    I can't really spot it but might the faint blueish / magenta area in SDSS below nucleus have anything to do with the lensing? There are several spots indicated in the paper.

    enter image description here


    J0141423–073528 (2MASX J01414232–0735281, SNL-2)
    This is our second newly-discovered lens system (Figure 2, row 3). SNL-2, with zlens = 0.052, is part of a galaxy pair (Figure 3); the companion galaxy is ∼1 mag fainter, located 7 arcsec to the North. SDSS imaging shows that the pair is embedded in a common, asymmetric stellar halo, indicating the galaxies are at a common distance and suggesting a recent or ongoing tidal interaction. SNL- 2 itself appears very regular; its effective radius (6.0 kpc) is com- parable to SNL-0, and its total luminosity is only slightly smaller (3×1011L⊙). The 6dF spectrum is consistent with a pure passive stellar continuum (Figure 4), but the Hα/[NII] region is contam- inated by telluric absorption so we cannot rule out weak nebular emission as securely as for SNL-0 and SNL-1.
    By chance, two separate SNELLS observations were obtained
    for SNL-2, so we combine the data to improve total depth . The H-band observation reveals emission in two lines consistent with the [O III] 4959, 5007 A ̊ doublet, at a redshift of z = 1.97. (The observer’s-frame wavelength is ∼1.48 μm, placing the lines at the short-wavelength edge of the H band, in a region of poor atmo- spheric transmission.) The lines are noticeably broad, with FWHM ∼550kms−1. The emission is concentrated in a bright source at 3.2 arcsec from the galaxy centre, with a fainter second image at radius 1.2arcsec diametrically opposite. The 4959-A ̊ line is not clearly seen in the fainter image, but we consider the concordant 5007-A ̊ line, and the symmetric configuration, sufficient to confirm this as a lensed counter-image. No counterpart to the emission-line source is visible in the SDSS imaging.

    From The SINFONI Nearby Elliptical Lens Locator Survey: Discovery of two new low-redshift strong lenses and implications for the initial mass function in giant early-type galaxies.

    Russell J. Smith (Durham), John R. Lucey (Durham), Charlie Conroy (Harvard)