Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..393..283b&link_type=abstract
The seventh astrophysical conference: Star formation, near and far. AIP Conference Proceedings, Volume 393, pp. 283-286 (1997).
Astronomy and Astrophysics
Astrophysics
1
Origin, Formation, Evolution, Age, And Star Formation, Spiral Galaxies, Star Formation
Scientific paper
de Vaucouleurs (1958) found that all members of a sample of nearly edge-on spirals had trailing arms relative to disk rotation. An exception was provided by the identification of a single arm in the galaxy NGC 4622 by Byrd et al. (1989). Buta, Crocker and Byrd (1992) observationally verified that an inner single arm occurs in the stellar disk of NGC 4622 and that it also shows the color/age position angle sequence of an m=1 leading density wave. Byrd, Freeman and Howard (1993) simulated NGC 4622's pattern with a small mass companion plunging close to the center in a retrograde orbit in the disk plane. A single long-lived leading arm is created in the central regions. NGC 4378 is also a single armed galaxy (Rubin et al. 1978, Sandage 1961). Byrd, Freeman and Howard (1994) simulated the arm pattern of NGC 4378 by a direct planar grazing encounter with a small galaxy. In contrast to NGC 4622, the simulation arm for NGC 4378 trailed. We use new B and I images and models to determine that NGC 4378's arm trails and show its lack of a star formation/age sequence. Thus NGC 4378 has a tidal arm not a one-armed density wave.
Buta Ronald J.
Byrd Gene Gilbert
Freeman Tarsh
McCormick Demetrius
Purcell Guy B.
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