IC 4767 (the 'X-galaxy') - The missing link for understanding galaxies with peanut-shaped bulges?

Details IC 4767 (the 'X-galaxy') - The missing link for understanding galaxies with peanut-shaped bulges? IC 4767 (the 'X-galaxy') - The missing link for understanding galaxies with peanut-shaped bulges?

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...324..741w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 324, Jan. 15, 1988, p. 741-748.

Astronomy and Astrophysics

Astrophysics

62

Elliptical Galaxies, Galactic Bulge, Galactic Structure, Interstellar Matter, Peculiar Galaxies, Seyfert Galaxies, Astronomical Photometry, Astronomical Spectroscopy, Galactic Nuclei, Isophotes, Ring Galaxies

Scientific paper

Photometric and kinematic observations of the peculiar S0 galaxy IC 4767, the 'X-galaxy', are presented. At various intensities the bulge of this galaxy looks like a normal spheroidal system with elliptical isophotes, a well-defined rectangle, and a peanut-shaped or X-shaped structure with components aligned at oblique angles to the major axis. The observations reveal a rapidly rotating inner disk of gas and dust which is nearly aligned with the major axis. The presence of gaseous emission alone suggests an accretion event. The stars in the outer regions of the X-component are rotating nearly as rapidly as the gas in the main disk, indicating that they are in relatively circular orbits. The five most prominent peanut-shaped bulges all have several nearby companions, evidence that the peanut deformity is due to interaction between galaxies. An analogy with the formation mechanism proposed for polar-ring galaxies suggests how an X-shaped component could develop from the accretion of gaseous material during an inclined encounter.

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