Statistical evidence that galaxy companions trigger bars and change the spiral Hubble type

Details Statistical evidence that galaxy companions trigger bars and change the spiral Hubble type Statistical evidence that galaxy companions trigger bars and change the spiral Hubble type

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...364..415e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 364, Dec. 1, 1990, p. 415-419.

Astronomy and Astrophysics

Astrophysics

80

Barred Galaxies, Galactic Clusters, Galactic Structure, Interacting Galaxies, Space Density, Statistical Analysis

Scientific paper

The number of barred (SB-type) galaxies relative to the total number of spiral galaxies in binary and group systems and in the field has been examined. Among field and group galaxies, 0.32 + or - 0.09 and 0.28 + or - 0.02 of all early Hubble-type spirals are SB, whereas in binary systems, 0.50+ or - 0.05 are SB. There is no obvious correlation like this for intermediate and late-type galaxies. This result implies that close galaxy companions are associated with bar formation, but primarily for early Hubble-types. In addition, the relative fraction of early-type galaxies (Sa-Sb) among all types Sa-Scd is examined. Among binary SB galaxies, the early-type fraction is 0.77 + or -0.05 whereas among all SA types in any environment the early-type fraction is only 0.44 + or - 0.02. Thus binary galaxies tend to be both barred and early type. Considering recent N-body simulations, it is suggested that galaxy interactions produce strong spirals, which, because of their torques, lead to bar formation and a significant mass inflow in the disk.

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