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(abridged) We present a dynamical analysis of the extended stellar streamencircling NGC 1097. Within a statistical framework, we model its surfacebrightness using mock streams as in Amorisco (2015) and deep imaging data fromthe CHART32 telescope (Stellar Tidal Stream Survey). We reconstruct thepost-infall evolution of the progenitor, which has experienced 3 pericentricpassages and lost more than 2 orders of magnitude in mass. At infall,$5.4\pm0.6$ Gyr ago, the progenitor was a disky dwarf with mass of$\log_{10}[m(<3.4\pm1 {\rm kpc})/ M_\odot]=10.35\pm0.25$. We illustrate how the90$^\circ$ turn in the stream, identifying the `dog leg', is the signature ofthe progenitor's prograde rotation. Today, the remnant is a nucleated dwarf,with a LOS velocity of $v_{\rm p, los}^{\rm obs}=-30\pm 30$ kms$^{-1}$, and aluminosity of $3.3\times 10^7 L_{V,\odot}$ (Galianni et al. 2010). Ourindependent analysis predicts $v_{\rm p, los}=-51^{-17}_{+14}$ kms$^{-1}$, andmeasures $\log_{10}(m/ M_\odot)=7.4^{+0.6}_{-0.8}$, so that the compact nucleusis soon becoming a low-luminosity UCD. We find that NGC 1097 has a mass of$M_{200}=1.8^{+0.5}_{-0.4} \times 10^{12}\; M_{\odot}$, and its concentration$c_{200}=6.7^{+2.4}_{-1.3}$ is in agreement with LCDM. The stream is describedalmost down to the noise in a spherical host potential, we find this would notbe possible if the halo was substantially triaxial at large radii. Itsmorphology shows that the slope of the total density profile bends from aninner $\gamma(r_{\rm peri})=1.5\pm0.15$. The progenitor's orbit reaches $r_{\rmapo}=150\pm 15$ kpc, more than a half of the virial radius of the host, sothat, for the first time on an individual extragalactic halo, we measure theouter density slope, $\gamma(0.6r_{200,c})=3.9\pm0.5$. This demonstrates thepromise of the newborn field of detailed, statistical modelling ofextragalactic tidal streams.

A dwarf galaxy's transformation and a massive galaxy's edge: autopsy of kill and killer in NGC 1097