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We present the results of a visual search for galaxy-scale gravitationallenses in nearly 7 square degrees of Hubble Space Telescope (HST) images. Thedataset comprises the whole imaging data ever taken with the Advanced Camerafor Surveys (ACS) in the filter F814W (I-band) up to August 31st, 2011, i.e.6.03 square degrees excluding the field of the Cosmic Evolution Survey (COSMOS)which has been the subject of a separate visual search. In addition, we havesearched for lenses in the whole Wide Field Camera 3 (WFC3) near-IR imagingdataset in all filters (1.01 square degrees) up to the same date. Our primarygoal is to provide a sample of lenses with a broad range of differentmorphologies and lens-source brightness contrast in order estimate a lowerlimit to the number of galaxy-scale strong lenses in the future Euclid surveyin its VIS band. Our criteria to select lenses are purely morphological as wedo not use any colour or redshift information.The final candidate selection isvery conservative hence leading to a nearly pure but incomplete sample. We find49 new lens candidates: 40 in the ACS images and 9 in the WFC3 images. Out ofthese, 16 candidates are secure lenses owing to their striking morphology, 21more are very good candidates, and 12 more have morphologies compatible withgravitational lensing but also compatible with other astrophysical objects. Itis therefore insensitive to cosmic variance and allows to estimate the numberof galaxy-scale strong lenses on the sky for a putative survey depth, which isthe main result of the present work. Because of the incompleteness of thesample, the estimated lensing rates should be taken as lower limits. Usingthese, we anticipate that a 15 000 square degrees space survey such as Euclidwill find at least 60 000 galaxy-scale strong lenses down to a limiting ABmagnitude of I = 24.5 (10-sigma) or I = 25.8 (3-sigma).

A seven square degrees survey for galaxy-scale gravitational lenses with the HST imaging archive