A giant intergalactic H I bubble near Arpl43

November 1987 • 1987Natur.330..140A

Authors • Appleton, P. N. • Ghigo, F. D. • van Gorkom, J. H. • Schombert, James M. • Struck-Marcell, Curtis

Abstract • We present observations of the nearby ring galaxy Arpl43 (NGC2445/4) and describe the discovery of a giant H I shell 20 kpc across, lying 100 kpc from Arpl43. The shell, which shows evidence for line splitting near its centre, lies in a long H I filament pointing towards the Arpl43 system. We suggest that the shell is an expanding bubble of H I, and is direct evidence for a powerful galactic-scale explosion 10⁸ years ago which we associate with a strong burst of star formation. We believe that both the ring galaxy and the giant bubble have their origin in the passage of a gas-rich companion through the inner disk of NGC2445, and its subsequent disruption.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=1987Natur.330..140A
• NED https://ned.ipac.caltech.edu/uri/NED::InRefcode/1987Nat...330..140A
• ELECTR https://doi.org/10.1038%2F330140a0