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Asymmetries in HI in galaxies are often caused by the interaction with closecompanions, making isolated galaxies an ideal framework to study secularevolution. The AMIGA project has demonstrated that isolated galaxies show thelowest level of asymmetry in their HI integrated profiles, yet some presentsignificant asymmetries. CIG 96 (NGC 864) is a representative case reaching a16% level. Our aim is to investigate the HI asymmetries of this spiral galaxyand what processes have triggered the star-forming regions observed in the XUVpseudoring. We performed deep optical observations at CAHA 1.23m, 2.2m and VSTtelescopes. We reach surface brightness (SB) limits of mu_2.2m = 27.5 magarcsec-2 (Cous R) and mu_VST = 28.7mag arcsec-2 (r) that show the XUVpseudoring of the galaxy in detail. Additionally, a wavelet filtering of the HIdata cube from our deep observations with E/VLA telescope allowed us to reach acolumn density of N_HI = 8.9x10^18 cm -2 (5sigma) (28"x28" beam), lower than inany isolated galaxy. We confirm that the HI extends farther than 4xr_25 in alldirections. Furthermore, we detect for the first time two gaseous structures(10^6 Msol) in the outskirts. The g-r colour index image from 1.23m showsextremely blue colours in certain regions of the pseudoring whereN_HI>8.5x10^20 cm-2 , whereas the rest show red colours. Galactic cirruscontaminate the field, setting an unavoidable detection limit at 28.5magarcsec-2 (r). We detect no stellar link within 1degx1deg or gaseous link within40'x40' between CIG 96 and any companion. The isolation criteria rule outinteractions with other similar-sized galaxies for at least 2.7Gyr. Usingexisting stellar evolution models, the age of the pseudoring is estimated at1Gyr or older. Undetected previously accreted companions and cold gas accretionremain as the main hypothesis to explain the optical pseudoring and HI featuresof CIG 96.

Unveiling the environment and faint features of the isolated galaxy CIG 96 with deep optical and HI observations