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2008MNRAS.384..886V - Mon. Not. R. Astron. Soc., 384, 886-906 (2008/March-1)
Adaptive optics imaging and optical spectroscopy of a multiple merger in a luminous infrared galaxy.
VAISANEN P., MATTILA S., KNIAZEV A., ADAMO A., EFSTATHIOU A., FARRAH D., JOHANSSON P.H., OSTLIN G., BUCKLEY D.A.H., BURGH E.B., CRAUSE L., HASHIMOTO Y., LIRA P., LOARING N., NORDSIECK K., ROMERO-COLMENERO E., RYDER S., STILL M. and ZIJLSTRA A.
Abstract (from CDS):
One nucleus is a regular barred spiral with significant rotation, while another is highly disturbed with a surface brightness distribution intermediate to that of disc and bulge systems, and hints of remaining arm/bar structure. We derive dynamical masses in the range 3-7x1010M☉for both. The third component appears to be a 1-2x1010M☉ mass irregular galaxy. The total system exhibits HII galaxy-like optical line ratios and strengths, and no evidence for active galactic nucleus (AGN) activity is found from optical or mid-IR data. The star formation rate is estimated to be ∼190M☉/yr. We also report a search for supernovae from NIR images separated by five months and search for superstar cluster candidates. We detect outflowing gas from the Bird mostly in the range 100-300 km/s using Nai D absorption features. Overall, the Bird shows kinematic, dynamical and emission-line properties typical for cool ultraluminous IR galaxies (ULIRGs). However, the interesting features setting it apart for future studies are its triple merger nature, and the location of its star formation peak - the strongest star formation, as revealed by Spitzer imaging, does not come from the two major K-band nuclei, but from the third irregular component. This is in contrast to the conventional view that the (U)LIRG phases are powered by infalling gas to the major nuclei of the merging spiral galaxies. Aided by simulations, we discuss scenarios where the irregular component is on its first high-speed encounter with the more massive components.
Abstract Copyright: © 2008 The Authors
Journal keyword(s): galaxies: evolution - galaxies: individual: IRAS 19115-2124 - galaxies: interactions - galaxies: kinematics and dynamics - galaxies: starburst - infrared: galaxies
Simbad objects: 5
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