Near-Infrared Observations of Hot Spots in the Circumnuclear Rings of NGC 2997 and NGC 6951

Details Near-Infrared Observations of Hot Spots in the Circumnuclear Rings of NGC 2997 and NGC 6951 Near-Infrared Observations of Hot Spots in the Circumnuclear Rings of NGC 2997 and NGC 6951

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....118..777e&link_type=abstract

The Astronomical Journal, Volume 118, Issue 2, pp. 777-784.

Astronomy and Astrophysics

Astronomy

19

Galaxies: Individual: Ngc Number: Ngc 2997, Galaxies: Individual: Ngc Number: Ngc 6951, Galaxies: Luminosity Function, Mass Function, Galaxies: Starburst, Galaxies: Star Clusters

Scientific paper

Near-infrared observations of NGC 2997 and NGC 6951 reveal complete rings of symmetrically placed hot spots, which are star-forming complexes. The masses of the complexes range from a few times 10^4 to a few times 10^5 M_solar in both galaxies. The regular hot-spot spacings of about 200 pc in a ring 55 pc thick in NGC 2997 and 380 pc in a ring 150 pc thick in NGC 6951 are consistent with formation by a large-scale gravitational instability in the rings. Visual extinction is estimated to be up to 3 mag around the ring in NGC 2997 and up to 5 mag in NGC 6951, as dust lanes spiral in and cross the ring. Hubble Space Telescope observations reveal smaller super-star clusters within the large complexes. These clusters have power-law luminosity functions with an exponent of approximately -2 in both galaxy rings, the same as for star-forming complexes in the disks of normal spiral galaxies.

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