Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...512..623d&link_type=abstract
The Astrophysical Journal, Volume 512, Issue 2, pp. 623-629.
Astronomy and Astrophysics
Astronomy
20
Galaxies: Active, Galaxies: Individual (Ngc 1672), Galaxies: Kinematics And Dynamics, Galaxies: Nuclei
Scientific paper
We present the detailed velocity field of the central 2 kpc of the LINER galaxy NGC 1672. The isovelocity map shows a rotational pattern with a velocity gradient of 50 km s^-1 arcsec^-1 in the inner 6" (1^''~70 pc), indicating a mass of ~9x10^8 M_solar inside a radius of 125 pc, equivalent to a density of ~2x10^11 M_solar kpc^-3. It also shows some asymmetries on a larger scale. An offset of ~60 pc between the nuclear continuum barycenter and the kinematical center is also found. Satoh's model fitting to the observed velocity field reveals several nonaxisymmetric residuals, which do not correlate well with the bar or the circumnuclear ring of H II regions. The inner rotation curve of NGC 1672 reveals that the circumnuclear ring of star formation is located on an inner Lindblad resonance (ILR), and not near the peak of the Lindblad curve, Omega-kappa/2, as suggested by previous works, which also claimed that the ring rotates faster than its ambient. This motion is not confirmed by the two-dimensional residual-velocity map.
Carranza Gustavo
Diaz Rafael
Dottori Horacio
Goldes Guillermo
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