The genesis of the ring galaxy ARP 144 (NGC 7828/29)

Details The genesis of the ring galaxy ARP 144 (NGC 7828/29) The genesis of the ring galaxy ARP 144 (NGC 7828/29)

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330l..29j&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 330, July 1, 1988, p. L29-L32.

Astronomy and Astrophysics

Astronomy

7

Galactic Structure, H I Regions, Infrared Sources (Astronomy), Ring Galaxies, Hydrogen Clouds, Molecular Clouds

Scientific paper

Most ring galaxies are thought to be the result of a close collision between a disk galaxy and a compact companion. A few ring systems, however, contain only a single remnant galaxy and are not easily explained by the ballistic collision model; foremost among these is Arp 144 (NGC 7828/29), which exhibits a seemingly empty "folded ring" and a spheroidal companion. The authors observed this system in the near-infrared spectral region where evolved stars shine brightly and the effects of extinction are minimal. Strong near-infrared sources are found in both NGC 7828 and NGC 7829 in the J, H, and K images; the integrated colors of both galaxies are quite similar and are typical of a 1010M_sun; evolved stellar population. Thus, the authors conclude that Arp 144 was formed during an encounter between two similarly massive galaxies.

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