Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....119..111d&link_type=abstract
The Astronomical Journal, Volume 119, Issue 1, pp. 111-118.
Astronomy and Astrophysics
Astronomy
6
Galaxies: Binary, Galaxies: Individual (Mcleish'S Object), Galaxies: Interactions, Galaxies: Kinematics And Dynamics, Galaxies: Nuclei, Galaxies: Peculiar
Scientific paper
We discuss the morphology, kinematics, and physical conditions of the emitting gas of the interacting system IRAS 20048-6621. We present as well numerical simulations of this interacting system, discovered by David McLeish in 1946. The main galaxy (McL A) is an edge-on spiral galaxy with highly distorted NW side. On this side is also located McL B, the perturber galaxy. We determined a distance of 151 Mpc (h=0.75) and a diameter of 70 kpc for McL A. It presents a bright nucleus with broad red emission lines (~500 km s-1). McL A has far-IR color indexes closely comparable to NGC 3628, one the few nearby edge-on galaxies which is a bright infrared emitter. Nevertheless, McL A is more luminous (in these bands) than any of the edge-on galaxies in the sample of bright infrared galaxies of Young et al. (1988). The two sides of McL A rotation curve are remarkably different. The N-body model that best reproduces McL A kinematical and morphological data (Kuijken & Dubinski 1995) gives a total mass 7x1011 Msolar for McL A. Numerical simulations with the TREESPH code closely reproduce the morphology and radial velocity observations. The best scenario for this system is that of a prograde encounter between McL A and B, with McL B's orbit 35 deg tilted with respect to the spiral disk of McL A and a perigalactic distance of 17.6 kpc. The derived mass ratio is McL B/McL A~1/26. In the last 5x108 yr the perturber has crossed the main galaxy disk twice, in between it crossed the perigalacticon. According to our simulations, the emitting gas present in McL B has not been stripped out from the McL A disk, so that leads us to conclude that McL B is an irregular or small spiral galaxy.
Carranza Gustavo
Diaz Rafael
Dottori Horacio
Rodrigues Irapuan
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