Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 402, Issue 1, Pages L44-L48Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1745-3933.2009.00796.x
Keywords
gravitational lensing; galaxies: clusters: general; galaxies: clusters: individual (A370)
Categories
Funding
- EU
- CNRS
- Agence Nationale de la Recherche [ANR-06-BLAN-0067]
- French-Israelian collaboration [07-AST-F9]
- CNES
- Danish National Research Foundation
- Agence Nationale de la Recherche (ANR) [ANR-06-BLAN-0067] Funding Source: Agence Nationale de la Recherche (ANR)
- STFC [ST/F002963/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F002963/1] Funding Source: researchfish
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We present a strong lensing analysis of the galaxy cluster Abell 370 (z = 0.375) based on the recent multicolour images by Advanced Camera for Surveys obtained as part of the Early Release Observation (ERO) that followed the Hubble Service Mission #4. Back in 1987, the giant gravitational arc (z = 0.725) in Abell 370 was one of the first pieces of evidence that massive clusters are dense enough to act as strong gravitational lenses. The new observations reveal in detail its disclike morphology, and we show that it can be interpreted as a complex five-image configuration, with a total magnification factor of 32 +/- 4. Moreover, the high-resolution multicolour information allowed us to identify 10 multiply imaged background galaxies. We derive a mean Einstein radius of theta(E) = 39 +/- 2 arcsec for a source redshift at z = 2, corresponding to a mass of M(
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