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We analyse the eastern region of a $5^\circ\times5^\circ$ deep HI survey ofthe M81 group containing the dwarf galaxy IC 2574 and the HI complex HIJASSJ1021+68, located between the dwarf and the M81 system. The data show that IC2574 has an extended HI envelope that connects to HIJASS J1021+68 in the formof a collection of small clouds, but no evident connection has been foundbetween IC 2574 and the central members of the M81 group. We argue, based onthe morphology of the clouds forming HIJASS J1021+68 and its velocitydistribution, that the complex is not a dark galaxy as previously suggested,but is instead a complex of clouds either stripped from, or falling onto theprimordial HI envelope of IC 2574. We also use the deep HI observations to mapthe extended HI envelope around IC 2574 and, using a 3D tilted-ring model, wederive the rotation curve of the galaxy to a larger extent than has been donebefore. Combining the obtained rotation curve to higher resolution curves fromthe literature, we constrain the galaxy's dark matter halo parameters.

A 5deg x 5deg deep HI survey of the M81 group: II. HI distribution and kinematics of IC 2574 and HIJASS J1021+68