Study of McLeish’s Interacting Object

摘要: We discuss the morphology, kinematics, and physical conditions of emitting gas interacting system IRAS 20048-6621. present as well numerical simulations this system, discovered by David McLeish in 1946. The main galaxy (McL A) is an edge-on spiral with highly distorted NW side. On side also located McL B, perturber galaxy. determined a distance 151 Mpc (h = 0.75) diameter 70 kpc for A. It presents bright nucleus broad red emission lines (FWHM ≈ 500 km s-1). A has far-IR color indexes closely comparable to NGC 3628, one few nearby galaxies which infrared emitter. Nevertheless, more luminous (in these bands) than any sample Young et al. (1988). two sides rotation curve are remarkably different. N-body model that best reproduces kinematical morphological data (Kuijken &Dubinski 1995) gives total mass 7 × 1011 M⊙ Numerical TREESPH code reproduce morphology radial velocity observations. scenario prograde encounter between B's orbit 35° tilted respect disk perigalactic 17.6 kpc. derived ratio B/McL 1/26. In last 5 108 yr crossed twice, it perigalacticon. According our simulations, B not been stripped out from disk, so leads us conclude irregular or small