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6 papers · 2 filters
The initial stellar mass function from random sampling in hierarchical clouds II: statistical fluctuations and a mass dependence for starbirth positions and times
B. G. Elmegreen
Observed variations in the slope of the initial stellar mass function are shown to be consistent with a model in which the protostellar gas is randomly sampled from hierarchical cl…
Dust Spirals and Acoustic Noise in the Nucleus of the Galaxy NGC 2207
B. G. Elmegreen, D. M. Elmegreen, E. Brinks +6
Observations with the Hubble Space Telescope reveal an irregular network of dust spiral arms in the nuclear region of the interacting disk galaxy NGC 2207. The spirals extend from…
Hierarchical Star Formation from the Time-Space Distribution of Star Clusters in the Large Magellanic Cloud
Y. N. Efremov, B. G. Elmegreen
The average age difference between pairs of star clusters in the Large Magellanic Clouds increases with their separation as the ~0.35 power. This suggests that star formation is hi…
Giant Shells and Stellar Arcs as Relics of Gamma Ray Burst Explosions
Y. N. Efremov, B. G. Elmegreen, P. W. Hodge
Gamma Ray Burst (GRB) explosions are powerful and frequent enough to make kiloparsec-size shells and holes in the interstellar media of spiral galaxies. The observations of such re…
Triggered Star Formation in the LMC4/Constellation III Region of the Large Magellanic Cloud
Yuri Efremov, Bruce Elmegreen
The origin of a regular, 600 pc-long arc of young stars and clusters in the Constellation III region of the Large Magellanic Cloud is considered. The circular form of this arc sugg…
Hierarchy of Interstellar and Stellar Structures and the Case of the Orion Star-Forming Region
Bruce G. Elmegreen, Yuri N. Efremov
Hierarchical structure from stellar clusters, to subgroups, to associations and star complexes is discussed in the context of the Orion stellar grouping and its origin. The analogo…