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R.J. Lavery, M.P. Lafky (NAU)
We have discovered a large gravitational arc, produced by a strong lensing event, associated with an isolated elliptical galaxy in a field observed by HST as part of the Parallel Observing Program. This large arc subtends an angle of 145 degrees around the galaxy with a radius of curvature of 0.7 seconds of arc. The arc is very blue in color and has a patchy light distribution. Photometry in three HST filters (F814W, F606W and F450W) provide an estimated redshift of 0.5 for the lensing galaxy.
There is a second smaller blue object located on the opposite side and closer to the core of the lensing galaxy. While this object may also be the result of lensing, the location and color of this second image do not support it being the counter-image to the much larger arc.
In addition to presenting the photometric and physical properties of this lens system, we will compare this system with other single galaxy lens systems and discuss the implications of the lensing configuration on the mass distribution in this system.
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Bulletin of the American Astronomical Society, 36 #2
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