Stellar ovals and nuclear rings in the interior of M51 and M100

Details Stellar ovals and nuclear rings in the interior of M51 and M100 Stellar ovals and nuclear rings in the interior of M51 and M100

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92..285p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 92, Aug. 1986, p. 285-291.

Astronomy and Astrophysics

Astronomy

55

Astronomical Photometry, Charge Coupled Devices, Galactic Nuclei, Spiral Galaxies, Stellar Evolution, Stellar Structure

Scientific paper

CCD images taken in the B, R, and I passbands have revealed substantial stellar ovals in the interior region (about 1 kpc) of the two nearby Sc galaxies M51 and M100. The amplitude of the azimuthal intensity variation is found to be 25 percent and 45 percent, respectively. The ovals are associated with both noncircular streaming motions and enhanced star formation. Blue (B - I about 0.8) rings of star formation are found near the outer boundary of the ovals. The close association of the star-forming rings and the ovals with the estimated position of the galaxy's inner Lindblad resonance (ILR) suggests a dynamical connection between the ovals and the ILR. Interestingly, M100 possess both an inner oval (within the ILR) and a classical bar (extending to near the expected radius for corotation).

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