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The Sloan Lens ACS Survey. XIII. Discovery of 40 New Galaxy-scale Strong Lenses

Shu, Y., Brownstein, J. R., Bolton, A. S., Koopmans, L. V. E., Treu, T., Montero-Dorta, A. D., Auger, M. W., Czoske, O., Gavazzi, R., Marshall, P. J. & Moustakas, L. A., 1-Dec-2017, In : The Astrophysical Journal. 851, 1, 48.

Research output: Contribution to journalArticleAcademicpeer-review

  • Yiping Shu
  • Joel R. Brownstein
  • Adam S. Bolton
  • Léon V. E. Koopmans
  • Tommaso Treu
  • Antonio D. Montero-Dorta
  • Matthew W. Auger
  • Oliver Czoske
  • Raphaël Gavazzi
  • Philip J. Marshall
  • Leonidas A. Moustakas
We present the full sample of 118 galaxy-scale strong-lens candidates in the Sloan Lens ACS (SLACS) Survey for the Masses (S4TM) Survey, which are spectroscopically selected from the final data release of the Sloan Digital Sky Survey. Follow-up Hubble Space Telescope (HST) imaging observations confirm that 40 candidates are definite strong lenses with multiple lensed images. The foreground-lens galaxies are found to be early-type galaxies (ETGs) at redshifts 0.06–0.44, and background sources are emission-line galaxies at redshifts 0.22–1.29. As an extension of the SLACS Survey, the S4TM Survey is the first attempt to preferentially search for strong-lens systems with relatively lower lens masses than those in the pre-existing strong-lens samples. By fitting HST data with a singular isothermal ellipsoid model, we find that the total projected mass within the Einstein radius of the S4TM strong-lens sample ranges from 3 × 1010 M ⊙ to 2 × 1011 M ⊙. In Shu et al., we have derived the total stellar mass of the S4TM lenses to be 5 × 1010 M ⊙ to 1 × 1012 M ⊙. Both the total enclosed mass and stellar mass of the S4TM lenses are on average almost a factor of 2 smaller than those of the SLACS lenses, which also represent the typical mass scales of the current strong-lens samples. The extended mass coverage provided by the S4TM sample can enable a direct test, with the aid of strong lensing, for transitions in scaling relations, kinematic properties, mass structure, and dark-matter content trends of ETGs at intermediate-mass scales as noted in previous studies. Based on observations made with the NASA/ESA Hubble Space Telescope (HST), obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555. These observations are associated with HST program #12210.
Original languageEnglish
Article number48
JournalThe Astrophysical Journal
Volume851
Issue number1
Publication statusPublished - 1-Dec-2017

    Keywords

  • dark matter, galaxies: evolution, gravitational lensing: strong, methods: observational, techniques: image processing, SEMILINEAR INVERSION , FUNDAMENTAL PLANE, DIGITAL SKY SURVEY, SPECTROSCOPICALLY SELECTED SAMPLE, INITIAL MASS FUNCTION, TO-LIGHT RATIOS, GRAVITATIONAL-LENS, ELLIPTIC GALAXIES, DARK-MATTER, STELLAR MASS

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