Astronomy and Astrophysics, volume 330, 841-872 (1998/2-3)
Bidimensional spectroscopy of double galaxies. II. Mkn 789, UGC 4085, UGC 3995.
CHATZICHRISTOU E.T., VANDERRIEST C. and LEHNERT M.
Abstract (from CDS):
We present data obtained using the integral field spectrograph, SILFID, on the CFHT for three galaxies: Mkn 789, UGC 4085, UGC 3995. These systems are part of a larger ensemble of interacting/merger candidates, that were specifically chosen to have a range of nuclear activity, IR properties and strength of interaction. Unlike slit spectra, these data arrays provide a direct two-dimensional picture of the wavelength-dependent emission and absorption line properties of the galaxies. With the complement of optical photometry, we analyze for each object the kinematics of the gas component and the details of the ionization structure. Mkn 789 is a recent merger with a fuzzy appearance whose infrared properties make it directly comparable to the powerful FIRGs. It is undergoing large scale star formation that powers a superwind seen as double peaked emission line profiles. We do not find any evidence for UGC 4085 to be a merger, as the two central knots are elongated, showing typical HII region like spectra and the general velocity field indicates a smooth retrogradely rotating disk. UGC 3995 is member of a closely interacting pair of galaxies that shows extended ''cone``-like ionized gas morphology along a bar-like structure. Additional velocity components detected in the [OIII] profiles are interpreted as gas inflow along the bar, that may be responsible for activating the Seyfert nucleus. On the basis of these data we argue that the gas dynamics in the central (10-20kpc) regions is dominated by the more energetic hydrodynamic processes rather than directly related to the merger itself.
galaxies: interactions - galaxies: Seyfert - galaxies: kinematics and dynamics - galaxies: individual: Mkn 789, UGC 4085, UGC 3995
Table 2: [CVL98] Mkn 789 A (Nos A-D), [CVL98] Mkn 789 Star N (Nos 1-2). Table 3: [CVL98] Mkn 789 Cw (Nos Ce, Cs). Table 4: [CVL98] UGC 4085 Knot A (Nos A-B), [CVL98] UGC 4085 Knot N (Nos 1-3), [CVL98] UGC 4085 Star N (Nos 1-2).
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