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We use data from two CFHT-MegaCam photometric pencil-beam surveys in the g'and the r' bands to measure distances to the Sagittarius, the Palomar 5 and theOrphan stream. We show that, using a cross-correlation algorithm to detect theturnoff point of the main sequence, it is possible to overcome the mainlimitation of a two-bands pencil-beam survey, namely the lack of adjacentcontrol-fields that can be used to subtract the foreground and background starsto enhance the signal on the colour-magnitude diagrams (CMDs). We describe thecross-correlation algorithm and its implementation. We combine the resultingmain sequence turnoff points with theoretical isochrones to derive photometricdistances to the streams. Our results (31 detections on the Sagittarius streamand one each for the Palomar 5 and the Orphan streams) confirm the findings byprevious studies, expand the distance trend for the Sagittarius faint southernbranch and, for the first time, trace the Sagittarius faint branch of thenorthern-leading arm out to 56 kpc. In addition, they show evidence for newsubstructure: we argue that these detections trace the continuation of theSagittarius northern-leading arm into the southern hemisphere, and find anearby branch of the Sagittarius trailing wrap in the northern hemisphere.

Finding halo streams with a pencil-beam survey: new wraps in the Sagittarius stream