Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-04-29
The Astrophysical Journal Letter 2010, 715, L160
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Minor typo corrections introduced. Journal reference and DOI added. 5 pages, 3 figures (2 in colors), 2 tables
Scientific paper
10.1088/2041-8205/715/2/L160
We have discovered strong gravitational lensing features in the core of the nearby cluster Abell 3827 by analyzing Gemini South GMOS images. The most prominent strong lensing feature is a highly-magnified, ring-shaped configuration of four images around the central cD galaxy. GMOS spectroscopic analysis puts this source at z~0.2. Located ~20" away from the central galaxy is a secondary tangential arc feature which has been identified as a background galaxy with z~0.4. We have modeled the gravitational potential of the cluster core, taking into account the mass from the cluster, the BCG and other galaxies. We derive a total mass of (2.7 +- 0.4) x 10^13 Msun within 37 h^-1 kpc. This mass is an order of magnitude larger than that derived from X-ray observations. The total mass derived from lensing data suggests that the BCG in this cluster is perhaps the most massive galaxy in the nearby Universe.
Bergmann Marcel
Carrasco Eleazar R.
Diaz Rafael
Gomez Percy L.
Lee Hyunyoung
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