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We analyse the distribution and origin of OVI in the Circumgalactic Medium(CGM) of dark-matter haloes of $\sim 10^{12}$ M$_\odot$ at $z\sim1$ in the VELAcosmological zoom-in simulations. We find that the OVI in the inflowing coldstreams is primarily photoionized, while in the bulk volume it is primarilycollisionally ionized. The photoionized component dominates the observed columndensity at large impact parameters ($\gtrsim 0.3 R_{\rm vir}$), while thecollisionally ionized component dominates closer in. We find that most of thecollisional OVI, by mass, resides in the relatively thin boundaries of thephotoionized streams. We discuss how the results are in agreement with analyticpredictions of stream and boundary properties, and their compatibility withobservations. This allows us to predict the profiles of OVI and other ions infuture CGM observations and provides a toy model for interpreting them.

OVI Traces Photoionized Streams With Collisionally Ionized Boundaries in Cosmological Simulations of $z \sim 1$ Massive Galaxies