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Using integral field spectroscopy from MaNGA, we study the resolvedmicrostructures in a shocked region in Criss Cross Nebula (CCN), with anunprecedentedly high resolution of $\lesssim$1000 AU. We measure surfacebrightness maps for 34 emission lines, which can be broadly divided into threecategories: (1) the [OIII] $\lambda$5007-like group including sevenhigh-ionization lines and two [OII] auroral lines which uniformly present aremarkable lane structure, (2) the H$\alpha$ $\lambda$6563-like group including23 low-ionization or recombination lines which present a clump-like structure,and (3) [OII] $\lambda$3726 and [OII] $\lambda$3729 showing high densities atboth the [OIII] $\lambda$5007 lane and the H$\alpha$ clump. We use thesemeasurements to constrain resolved shock models implemented in MAPPINGS V. Wefind our data can be reasonably well-fitted by a model which includes aplane-parallel shock with a velocity of $133\pm5$ km/s, plus an isotropictwo-dimensional Gaussian component which is likely another clump of gas ionizedby photons from the shocked region, and a constant background. We compare theelectron density and temperature profiles as predicted by our model with thosecalculated using observed emission line ratios. We find different line ratiosto provide inconsistent temperature maps, and the discrepancies can beattributed to observational effects caused by limited spatial resolution andprojection of the shock geometry, as well as contamination of the additionalGaussian component. Implications on shock properties and perspectives on futureIFS-based studies of CCN are discussed.

Criss Cross Nebula: Case study of shock regions with resolved microstructures at scales of $\sim$1000 AU