News Release Archive:

News Release 10 of 42

August 19, 2010 02:00 PM (EDT)

News Release Number: STScI-2010-26

First Use of Cosmic Lens to Probe Dark Energy

Technical facts about this news release:

About the Object

Object Name:	Abell 1689
Object Description:	Galaxy Cluster
Position (J2000):	R.A. 13h11m 34s.20 Dec. -01° 21' 56".0
Constellation:	Virgo
Distance:	The distance to the lensing cluster is 2.2 billion light-years (675 megaparsecs). The distance to the lensed galaxy is about 12.8 billion light-years.

About the Data

Data Description:	ACS/WFC data of Abell 1689 were observed with the HST proposal 9289: H. Ford and N. Benitez (Johns Hopkins University), and T. Broadhurst (Tel Aviv University). The science team for this release includes E. Jullo (Jet Propulsion Laboratory), P. Natarajan (Yale University), J.-P. Kneib (Laboratoire d'Astrophysique de Marseille, CNRS, France), A. D'Aloisio (Yale University), M. Limousin (Laboratoire d'Astrophysique de Marseille and University of Copenhagen, Denmark), J. Richard (Durham University, U.K.), and C. Schimd (Laboratoire d'Astrophysique de Marseille, CNRS, France).
Instrument:	ACS/WFC
Exposure Date(s):	June 12-21, 2002
Exposure Time:	10.5 hours
Filters:	F475W (g), F775W (i), and F850LP (z)

About the Release

Credit:

NASA, ESA, E. Jullo (Jet Propulsion Laboratory), P. Natarajan (Yale University), and J.-P. Kneib (Laboratoire d'Astrophysique de Marseille, CNRS, France)

Release Date:

August 19, 2010

Color:

This image is a composite of separate exposures acquired by the ACS instrument on the Hubble Space Telescope (HST). Several filters were used to sample broad wavelength ranges. The color results from assigning different hues (colors) to each monochromatic (grayscale) image associated with an individual filter. In this case, the assigned colors are:

F850LP (z)	red
F775W (i)	green
F475W (g)	blue
Dark Matter Map	blue

Orientation: