Extremely rapid star cluster disruption in high-shear circumnuclear starburst rings: the unusual case of NGC 7742
arXiv:1209.2429 · doi:10.1088/2041-8205/758/1/L22
Abstract
All known mass distributions of recently formed star cluster populations resemble a "universal" power-law function. Here we assess the impact of the extremely disruptive environment in NGC 7742's circumnuclear starburst ring on the early evolution of the galaxy's high-mass (~10^5-10^7 Msun) star cluster population. Surprisingly, and contrary to expectations, at all ages -- including the youngest, <15 Myr -- the cluster mass functions are robustly and verifiably represented by lognormal distributions that resemble those commonly found only for old, evolved globular cluster systems in the local Universe. This suggests that the high-shear conditions in the NGC 7742 starburst ring may significantly speed up dynamical star cluster destruction. This enhanced mass-dependent disruption rate at very young ages might be caused by a combination of the starburst ring's high density and the shear caused by the counterrotating gas disk in the galaxy's inner region.
12 pages in AAS preprint format, 2 figures; ApJ (Letters), in press
References in corpus (9)
- The SAURON project - VII. Integral-field absorption and emission-line kinematics of 24 spiral galaxy bulges
- GALEV evolutionary synthesis models - I. Code, input physics and web-interface
- The SAURON project - XI. Stellar Populations from Absorption Line Strength Maps of 24 Early-Type Spirals
- Similarities in Populations of Star Clusters
- A Connection between Star Formation in Nuclear Rings and their Host Galaxies
- Star formation and stellar populations across nuclear rings in galaxies
- Star cluster "infant mortality" in the Small Magellanic Cloud (Redivivus)
- The Initial Cluster Mass Function of Super Star Clusters in Irregular and Spiral Galaxies
- Discovery of ultra-compact nuclear rings in three spiral galaxies
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- Star clusters in a nuclear star-forming ring: The disappearing string of pearls
- Star cluster disruption in the starburst galaxy Messier 82
- Improved method to determine the integrated properties of nuclear rings: NGC 1512
- Young star clusters in circumnuclear starburst rings