A giant intergalactic H I bubble near Arp143

Details A giant intergalactic H I bubble near Arp143 A giant intergalactic H I bubble near Arp143

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.330..140a&link_type=abstract

Nature (ISSN 0028-0836), vol. 330, Nov. 12, 1987, p. 140-142.

Astronomy and Astrophysics

Astronomy

18

H I Regions, Intergalactic Media, Star Formation, Astronomical Maps, Bubbles, Collisions, Galaxies, Ring Galaxies, Very Large Array (Vla)

Scientific paper

The authors present observations of the nearby ring galaxy Arp 143 (NGC 2445/4) and describe the discovery of a giant H I shell 20 kpc across, lying 100 kpc from Arp 143. The shell, which shows evidence for line splitting near its centre, lies in a long H I filament pointing towards the Arp 143 system. The authors suggest that the shell is an expanding bubble of H I, and is direct evidence for a powerful galactic-scale explosion 108years ago which is associated with a strong burst of star formation. They 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 NGC 2445, and its subsequent disruption.

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