We report on the results of a visual search for galaxy-scale strong gravitational lenses over 650 arcmin ^ { 2 } of HST /ACS imaging in the Extended Groth Strip ( EGS ) .
These deep F606W- and F814W-band observations are in the DEEP2-EGS field .
In addition to a previously-known Einstein Cross also found by our search ( the “ Cross , ” HST J141735+52264 , with z _ { lens } = 0.8106 and a published z _ { source } = 3.40 ) , we identify two new strong galaxy-galaxy lenses with multiple extended arcs .
The first , HST J141820+52361 ( the “ Dewdrop ” ; z _ { lens } = 0.5798 ) , lenses two distinct extended sources into two pairs of arcs ( z _ { source } = 0.9818 by nebular [ O II ] emission ) , while the second , HST J141833+52435 ( the “ Anchor ” ; z _ { lens } = 0.4625 ) , produces a single pair of arcs ( source redshift not yet known ) .
Four less convincing arc/counter-arc and two-image lens candidates are also found and presented for completeness .
All three definite lenses are fit reasonably well by simple singular isothermal ellipsoid models including external shear , giving \chi ^ { 2 } _ { \nu } values close to unity .
Using the three-dimensional line-of-sight ( LOS ) information on galaxies from the DEEP2 data , we calculate the convergence and shear contributions \kappa _ { los } and \gamma _ { los } to each lens , assuming singular isothermal sphere halos truncated at 200 h ^ { -1 } kpc .
These are compared against a robust measure of local environment , \delta _ { 3 } , a normalized density that uses the distance to the third nearest neighbor .
We find that even strong lenses in demonstrably underdense local environments may be considerably affected by LOS contributions , which in turn , under the adopted assumptions , may be underestimates of the effect of large scale structure .