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2000AJ....120..630E - Astron. J., 120, 630-644 (2000/August-0)
Hubble space telescope observations of the interacting galaxies NGC 2207 and IC 2163.
ELMEGREEN B.G., KAUFMAN M., STRUCK C., ELMEGREEN D.M., BRINKS E., THOMASSON M., KLARIC M., LEVAY Z., ENGLISH J., FRATTARE L.M., BOND H.E., CHRISTIAN C.A., HAMILTON F. and NOLL K.
Abstract (from CDS):
A spiral arm of NGC 2207 that is backlit by IC 2163 is seen with HST to contain several parallel, knotty filaments spanning the full width of the arm. These filaments are probably shock fronts in a density wave. The parallel structure suggests that the shocks occur in several places throughout the arm, or that the interarm gas is composed of spiral-like wisps that merge together in the arms. Blue clusters of star formation inside the clumps of these dust lanes show density-wave triggering in unprecedented detail. The star formation process seems to be one of local gravitational collapse, rather than cloud collisions. Spiral arms inside the oval of IC 2163 have a familiar geometry reminiscent of a bar, although there is no obvious stellar bar. The shape and orientation of these arms suggest they could be the result of inner Lindblad resonance-related orbits in the cos2θ tidal potential that formed the oval. Their presence suggests that tidal forces alone may initiate a temporary nuclear gas flow and eventual starburst without first forming a stellar bar. Several emission structures resembling jets or conical flows that are 100-1000 pc long appear in these galaxies. In the western arm of NGC 2207, there is a dense dark cloud with a conical shape 400 pc long and a bright compact cluster at the tip, and there is a conical emission nebula of the same length that points away from the cluster in the other direction. This region also coincides with a nonthermal radio continuum source that is ∼1000 times the luminosity of Cas A at λ=20 cm. Surrounding clusters in arclike patterns may have been triggered by enormous explosions.
Abstract Copyright: ∼
Journal keyword(s): ISM: Dust, Extinction - Galaxies: Interactions - Galaxies: ISM - ISM: Jets and Outflows - ISM: Kinematics and Dynamics
Nomenclature: Figs 6-7: [EKS2000] a (Nos a-u).
Errata: Erratum vol. 120, p. 3371 (2000)
Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.
Simbad objects: 22
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