SDSS-IV MaNGA: a catalogue of spectroscopically detected strong galaxy–galaxy lens candidates

Author:

Talbot Michael S1,Brownstein Joel R1ORCID,Neumann Justus2ORCID,Thomas Daniel2ORCID,Maraston Claudia2,Drory Niv3

Affiliation:

1. Department of Physics and Astronomy, University of Utah , 115 S. 1400 E., Salt Lake City, UT 84112, USA

2. Institute of Cosmology & Gravitation, University of Portsmouth , Dennis Sciama Building, Portsmouth PO1 3FX, UK

3. McDonald Observatory, The University of Texas at Austin , 1 University Station, Austin, TX 78712, USA

Abstract

ABSTRACT We spectroscopically detected candidate emission-lines of 8 likely, 17 probable, and 69 possible strong galaxy–galaxy gravitational lens candidates found within the spectra of $\approx 10\, 000$ galaxy targets contained within the completed Mapping of Nearby Galaxies at Apache Point Observatory survey. This search is based upon the methodology of the Spectroscopic Identification of Lensing Objects project, which extends the spectroscopic detection methods of the BOSS Emission-Line Lensing Survey and the Sloan Lens ACS Survey. We scanned the co-added residuals that we constructed from stacks of foreground subtracted row-stacked-spectra so a sigma-clipping method can be used to reject cosmic rays and other forms of transients that impact only a small fraction of the combined exposures. We also constructed narrow-band images from the signal to noise of the co-added residuals to observe signs of lensed source images. We also use several methods to compute the probable strong lensing regime for each candidate lens to determine which candidate background galaxies may reside sufficiently near the galaxy centre for strong lensing to occur. We present the spectroscopic redshifts within a value-added catalogue (VAC) for data release 17 (DR17) of SDSS-IV. We also present the lens candidates, spectroscopic data, and narrow-band images within a VAC for DR17. High resolution follow-up imaging of these lens candidates are expected to yield a sample of confirmed grade-A lenses with sufficient angular size to probe possible discrepancies between the mass derived from a best-fitting lens model, and the dynamical mass derived from the observed stellar velocities.

Funder

Alfred P. Sloan Foundation

U.S. Department of Energy

Office of Science

University of Utah

Carnegie Mellon University

Johns Hopkins University

University of Tokyo

Lawrence Berkeley National Laboratory

Leibniz-Institut für Astrophysik Potsdam

New Mexico State University

New York University

University of Notre Dame

MCTI

Ohio State University

Pennsylvania State University

Universidad Nacional Autónoma de México

University of Arizona

University of Colorado Boulder

Oxford University

University of Portsmouth

University of Virginia

University of Washington

Vanderbilt University

Yale University

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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