Journal article
The Hidden Fortress: structure and substructure of the complex strong lensing cluster SDSS J1029+2623
Monthly notices of the Royal Astronomical Society, v 429(1), pp 482-493
01 Feb 2013
Abstract
We present Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) and Wide Field Camera 3 (WFC3) observations of SDSS J1029+2623, a three-image quasar lens system produced by a foreground cluster at z = 0.584. Our strong lensing analysis reveals six additional multiply imaged galaxies in addition to the multiply imaged quasar. We confirm the complex nature of the mass distribution of the lensing cluster, with a bimodal dark matter distribution which deviates from the Chandra X-ray surface brightness distribution. The Einstein radius of the lensing cluster is estimated to be theta(E) = 15.2 +/- 0.5 arcsec for the quasar redshift of z = 2.197. We derive a radial mass distribution from the combination of strong lensing, HST/ACS weak lensing and Subaru/Suprime-cam weak lensing analysis results, finding a best-fitting virial mass of M-vir = 1.55(-0.35)(+0.40) x 10(14) h(-1) M-circle dot and a concentration parameter of c(vir) = 25.7(-7.5)(+14.1). The lensing mass estimate at the outer radius is smaller than the X-ray mass estimate by a factor of similar to 2. We ascribe this large mass discrepancy to shock heating of the intracluster gas during a merger, which is also suggested by the complex mass and gas distributions and the high value of the concentration parameter. In the HST image, we also identify a probable galaxy, GX, in the vicinity of the faintest quasar image C. In strong lens models, the inclusion of GX explains the anomalous flux ratios between the quasar images. The morphology of the highly elongated quasar host galaxy is also well reproduced. The best-fitting model suggests large total magnifications of 30 for the quasar and 35 for the quasar host galaxy, and has an AB time delay consistent with the measured value.
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Details
- Title
- The Hidden Fortress: structure and substructure of the complex strong lensing cluster SDSS J1029+2623
- Creators
- Masamune Oguri - Institute for the Physics and Mathematics of the UniverseTim Schrabback - Kavli Institute for Particle Astrophysics and CosmologyEric Jullo - Laboratoire d’Astrophysique de MarseilleNaomi Ota - Nara Women's UniversityChristopher S. Kochanek - The Ohio State UniversityXinyu Dai - University of OklahomaEran O. Ofek - Weizmann Institute of ScienceGordon T. Richards - Drexel UniversityRoger D. Blandford - Kavli Institute for Particle Astrophysics and CosmologyEmilio E. Falco - Center for Astrophysics Harvard & SmithsonianJanine Fohlmeister - Heidelberg University
- Publication Details
- Monthly notices of the Royal Astronomical Society, v 429(1), pp 482-493
- Publisher
- Oxford Univ Press
- Number of pages
- 12
- Grant note
- 23740161 / Grants-in-Aid for Scientific Research; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT); Japan Society for the Promotion of Science; Grants-in-Aid for Scientific Research (KAKENHI) World Premier International Research Center Initiative (WPI Initiative); Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) NAS 5-26555 / NASA; National Aeronautics & Space Administration (NASA) GO011147B / NASA/SAO; National Aeronautics & Space Administration (NASA) 23740161 / JSPS; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT); Japan Society for the Promotion of Science HST-GO-12915.07-A / NASA/STScI; Space Telescope Science Institute; National Aeronautics & Space Administration (NASA) MEXT, Japan; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) FIRST program 'Subaru Measurements of Images and Redshifts (SuMIRe)' AST-0444059-001; AST-1009756 / NSF; National Science Foundation (NSF) GO0-11147A / Smithsonian Astrophysics Observatory
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000318238300059
- Scopus ID
- 2-s2.0-84873440545
- Other Identifier
- 991019168687804721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics