Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-22
ApJ 689, L37 (2008)
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Astrophysical Journal Letters. 13 pages, 4 figures
Scientific paper
10.1086/595728
Leading spiral arms are a rare phenomenon. We present here one of the very few convincing candidates of spiral arms opening counter-intuitively in the same direction as the galaxy disk is rotating. This detection in a luminous IR galaxy (LIRG) IRAS 18293-3134 is based on near infrared (NIR) adaptive optics imaging with the Very Large Telescope and long-slit NIR spectroscopy with the Anglo-Australian Telescope. We discuss the orientation of the galaxy based on imaging and derive rotation curves from both emission and absorption features in the spectrum. The galaxy is strongly star-forming and has a minor companion in a high-velocity encounter. The fact that the arms of IRAS 18293-3134 are not easily traceable from optical images suggests that larger samples of high-quality NIR imaging of interacting systems and LIRGs might uncover further cases of leading arms, placing constraints on spiral arm theories and retrograde encounters, and especially on the relationship between disk masses and dark matter halo masses.
Kotilainen Jari
Mattila Seppo
Ryder Stuart
Vaisanen Petri
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