Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-01-28
Astronomy and Astrophysics
Astrophysics
7 pages, 1 plot, and 1 figure. Submitted to ApJL and accepted
Scientific paper
10.1086/319149
We report velocity-resolved spectroscopy of infrared hydrogen recombination lines in the interacting region of the Antennae galaxies (NGC 4038/4039). It generally has been assumed that the active star formation found there is due to the interaction of the disks of the two galaxies and indeed two molecular cloud complexes, separated in velocity by $\sim$100 km s$^{-1}$, have been observed in the southern part of this region. Our measurements imply that the two cloud complexes are moving away from each other. This result poses interesting questions about the physical mechanisms leading to starbursts in Arp 244 and other interacting galaxies.
Geballe Thomas Ronald
Kim Dong Chan
Liang Mao-Chang
Lo Kwok Yung
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