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Adaptive optics imaging and optical spectroscopy of a multiple merger in a luminous infrared galaxy | | P. Vaisanen
; S. Mattila
; A. Kniazev
; A. Adamo
; A. Efstathiou
; D. Farrah
; P. H. Johansson
; G. Ostlin
; D. A. H. Buckley
; E. B. Burgh
; L. Crause
; Y. Hashimoto
; P. Lira
; N. Loaring
; K. Nordsieck
; E. Romero-Colmenero
; S. Ryder
; M. Still
; A. Zijlstra
; | | Date: |
17 Aug 2007 | | Abstract: | (abridged) We present near-infrared (NIR) adaptive optics imaging obtained
with VLT/NACO and optical spectroscopy from the Southern African Large
Telescope (SALT) of a luminous infrared galaxy (LIRG) IRAS 19115-2124. These
data are combined with archival HST imaging and Spitzer imaging and
spectroscopy, allowing us to study this disturbed interacting/merging galaxy,
dubbed the Bird, in extraordinary detail. In particular, the data reveal a
triple system where the LIRG phenomenon is dominated by the smallest of the
components.
One nucleus is a regular barred spiral with significant rotation, while
another is highly disturbed with a surface brightness distribution intermediate
to that of disk and bulge systems, and hints of remaining arm/bar structure. We
derive dynamical masses in the range 3-7x10^10 M_solar for both. The third
component appears to be a 1-2x10^10 M_solar mass irregular galaxy. The total
system exhibits HII galaxy-like optical line ratios and strengths, and no
evidence for AGN activity is found from optical or mid-infrared data. The star
formation rate is estimated to be 190 M_solar/yr. We search for SNe, super star
clusters, and detect 100-300 km/s outflowing gas from the Bird. Overall, the
Bird shows kinematic, dynamical, and emission line properties typical for cool
ultra luminous IR galaxies. 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 does not come from the two major
K-band nuclei, but from the third irregular component. Aided by simulations, we
discuss scenarios where the irregular component is on its first high-speed
encounter with the more massive components. | | Source: | arXiv, 0708.2365 | | Services: | Forum | Review | PDF | Favorites | |
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