Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-10-13
ApJS, 193, 8 (2011)
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
27 Pages, 13 Figures, 4 Tables, eapj, published in ApJS
Scientific paper
10.1088/0067-0049/193/1/8
We present results from a spectroscopic program targeting 26 strong lensing cluster cores that were visually identified in the Sloan Digital Sky Survey (SDSS) and the Second Red-Sequence Cluster Survey (RCS-2). The 26 galaxy cluster lenses span a redshift range of 0.2 < z < 0.65, and our spectroscopy reveals 69 unique background sources with redshifts as high as z=5.200. We also identify redshifts for 262 cluster member galaxies and measure the velocity dispersions and dynamical masses for 18 clusters where we have redshifts for N \geq 10 cluster member galaxies. We include an accounting for the expected biases in dynamical masses of strong lensing selected clusters as predicted by results from numerical simulations and discuss possible sources of bias in our observations. The median dynamical mass of the 18 clusters with N \geq 10 spectroscopic cluster members is M_{Vir} = 7.84 x 10^14 M_sun h_{0.7}^{-1}, which is somewhat higher than predictions for strong lensing selected clusters in simulations. The disagreement is not significant considering the large uncertainty in our dynamical data, systematic uncertainties in the velocity dispersion calibration, and limitations of the theoretical modeling. Nevertheless our study represents an important first step toward characterizing large samples of clusters that are identified in a systematic way as systems exhibiting dramatic strong lensing features.
Bayliss Matthew B.
Dahle Hakon
Gladders Michael D.
Hennawi Joseph F.
Koester Benjamin P.
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