News Release Archive:

News Release 52 of 884

March 15, 2012 09:00 AM (EDT)

News Release Number: STScI-2012-14

Astronomers Using NASA's Hubble Discover Quasars Acting as Gravitational Lenses

Technical facts about this news release:

About the Object

Object Descriptions:	QSO gravitational lenses on background emission-line galaxies
Object Names:	SDSS J0919+2720	SDSS J1005+4016	SDSS J0827+5224
Positions (J2000):	09h 19m 26s.22 +27° 20' 51".0	10h 05m 22s.06 +40° 16' 10".1	08h 27m 25s.20 +52° 24' 35".1
Constellations:	Cancer	Leo Minor	Lynx
Redshifts:	z(quasar galaxy) = 0.209 z(lensing source) = 0.558	z(quasar galaxy) = 0.230 z(lensing source) = 0.441	z(quasar galaxy) = 0.293 z(lensing source) = 0.412
Exposure Dates:	February 26, 2011	February 1, 2011	March 12, 2011
Exposure Times:	1.4h	1.3h	1.3h

About the Hubble Data

Data Description:	The image was created from Hubble data from proposal 12233: F. Courbin, G. Meylan, M. Tewes, and P. Jablonka (EPFL, Switzerland), S.G. Djorgovski and A. Mahabal (Caltech), P. Magain (Universite de Liege, Belgium), and D. Sluse (Bonn University, Germany). The science team includes: F. Courbin, C. Faure, F. Rerat, M. Tewes, and G. Meylan (EPFL, Switzerland), S.G. Djorgovski and A. Mahabal (Caltech), D. Stern (JPL), T. Boroson (NOAO), D. Sluse (Bonn University, Germany), and R. Dheeraj (University of Maryland).
Instrument:	WFC3/UVIS
Filters:	F475W (B) and F814W (I)

About the Release

Image Credit:

NASA, ESA, and F. Courbin (EPFL, Switzerland)

Release Date:

March 15, 2012

Color:

This image is a composite of separate exposures acquired by the WFC3 UVIS instrument. Several filters were used to sample various wavelength and energy 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:

F475W (B)	blue
F814W (I)	orange

Orientation/Scale:

Compass and Scale Image of Quasar Lenses