  Tidal ring galaxies are observed rarely in the local universe due to their
intrinsically transient nature. The tidal ring structures are the result of
strong interactions between gas-rich stellar disks and smaller galactic systems
and do not last longer than ~500~Myr therefore, these are perfect scenarios
where to find the debris of recently accreted dwarf galactic systems. We
present new deep images of the NGC 922 tidal ring galaxy and its surroundings
from the DESI Legacy survey data and from our observations with an amateur
telescope. These observations are compared with results from high-resolution
N-body simulations designed to reproduce an alternative formation scenario for
this peculiar galaxy. Our new observations unveil that the low surface
brightness stellar tidal structures around NGC 922 are much more complex than
reported in previous works. In particular, the formerly detected tidal
spike-like structure at the northeast of the central galaxy disk is not
connected with the dwarf companion galaxy PGC3080368, which has been suggested
as the intruder triggering the ring formation of NGC 922. The deep images
reveal that this tidal structure is mainly composed by a fainter giant
umbrella-like shape and thus it was formed from the tidal disruption of a
different satellite. Using the broad-band g, r and z DESI LS images, we
measured the photometric properties of this stellar stream, estimating a total
absolute magnitude in r-band of Mr= -17.0 +/- 0.03 magn and a total stellar
mass for the stream between 6.9-8.5X10^8 Mo. We perform a set of N-body
simulations to reproduce the observed NGC 922-intruder interaction, suggesting
a new scenario for the formation of its tidal ring from the in-fall of a gas
rich satellite around 150 Myr ago.
