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

1988; IOP Publishing; Volume: 330; Linguagem: Inglês

10.1086/185198

1538-4357

Marshall Joy, Jr. Ellis H. B., E. V. Tollestrup, D. Brock, J. L. Higdon, P. M. Harvey,

Stellar, planetary, and galactic studies

view Abstract Citations (7) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Genesis of the Ring Galaxy ARP 144 (NGC 7828/29) Joy, Marshall ; Ellis, H. B., Jr. ; Tollestrup, E. V. ; Brock, D. ; Higdon, J. L. ; Harvey, P. M. Abstract 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. This unusual structure led Freeman and de Vaucouleurs to propose in 1974 that the distorted ring in Arp 144 was created as the gaseous disk was stripped from a spiral galaxy during a collision with an intergalactic H I cloud. To trace the dynamical history of the encounter and to distinguish between the competing models of Arp 144, we 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 our J, H, and K images; the integrated colors of both galaxies are quite similar and are typical of a 10^10^ M_sun_ evolved stellar population. Thus, we conclude that Arp 144 was formed during an encounter between two similarly massive galaxies; the intergalactic cloud hypothesis appears to be untenable, since it unequivocally predicts the existence of a single evolved stellar nucleus. These observations illustrate the efficacy of near-infrared imaging of galaxies, especially in dust-shrouded systems which are highly obscured at visual wavelengths. Publication: The Astrophysical Journal Pub Date: July 1988 DOI: 10.1086/185198 Bibcode: 1988ApJ...330L..29J Keywords: Galactic Structure; H I Regions; Infrared Sources (Astronomy); Ring Galaxies; Hydrogen Clouds; Molecular Clouds; Astrophysics; GALAXIES: INDIVIDUAL NGC NUMBER: NGC 7828; GALAXIES: INDIVIDUAL NGC NUMBER: NGC 7829; GALAXIES: INDIVIDUAL NAME: ARP 144; GALAXIES: INTERACTIONS; GALAXIES: STRUCTURE; INFRARED: SOURCES full text sources ADS | data products SIMBAD (2) NED (2)