Details

Autor(en) / Beteiligte

• Shu, Yiping
• Brownstein, Joel R.
• Bolton, Adam S.
• Koopmans, Léon V. E.
• Treu, Tommaso
• Montero-Dorta, Antonio D.
• Auger, Matthew W.
• Czoske, Oliver
• Gavazzi, Raphaël
• Marshall, Philip J.
• Moustakas, Leonidas A.

Titel

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

Ist Teil von

• The Astrophysical journal, 2017-12, Vol.851 (1), p.48

Ort / Verlag

Philadelphia: IOP Publishing

Erscheinungsjahr

2017

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• Abstract 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 × 10 10 M ⊙ to 2 × 10 11 M ⊙ . In Shu et al., we have derived the total stellar mass of the S4TM lenses to be 5 × 10 10 M ⊙ to 1 × 10 12 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.