Evidence for nonaxisymmetric nuclear bulges in spiral galaxies

Details Evidence for nonaxisymmetric nuclear bulges in spiral galaxies Evidence for nonaxisymmetric nuclear bulges in spiral galaxies

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303...66z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 1, 1986, p. 66-75.

Other

80

Astronomical Spectroscopy, Galactic Nuclei, Galactic Structure, Gas Dynamics, Spiral Galaxies, Brightness Distribution, Data Reduction, Isophotes

Scientific paper

The 0.8-micron surface brightness distribution of the nuclear region of 11 galaxies was analyzed to look for evidence of deviation from axisymmetry. Nuclear bulges are clearly present in all the galaxies, including the Sc galaxies. Variation of the position angle and ellipticity with semimajor axis length of the elliptical isophotes of the nuclear region was found in all the galaxies. This suggests that nonaxisymmetric nuclear bulges could be very common in ordinary spiral galaxies. As a result, the presence of noncircular gas motion in the central regions of spiral galaxies should be generally anticipated. Other implications are also discussed.

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