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Recent evidence of extremely metal-rich stars found in the Sombrero galaxy(M104) halo suggests that this galaxy has undergone a recent major merger witha relatively massive galaxy. In this paper, we present wide-field deep imagesof the M104 outskirts obtained with a 18-cm amateur telescope with the purposeof detecting any coherent tidal features from this possible major merger. Ournew data, together with a model of the M104 inner halo and scattered light fromstars around the field, allow us to trace for the first time the full path ofthe stream on both sides of the disk of the galaxy. We fully characterize thering-like tidal structure and we confirm that this is the only observablecoherent substructure in the inner halo region. This result is in agreementwith the hypothesis that M104 was created by a wet major merger more than 3.5Gyr ago that heated up the stellar population, blurring all old substructure.We generated a set of numerical models that reproduce the formation of theobserved tidal structure. Our best fit model suggests the formation of thisstream in the last 3 Gyr is independent of the wet major merger that createdthe M104 system. Therefore, the formation of the tidal stream can put aconstraint on the time when the major merger occurred.

A feather on the hat: Tracing the giant stellar stream around the Sombrero galaxy