A Fractal Origin for the Mass Spectrum of Interstellar Clouds. II. Cloud Models and Power-Law Slopes
- B. Elmegreen
- Physics
- 10 November 1996
Three-dimensional fractal models on grids of ~2003 pixels are generated from the inverse Fourier transform of noise with a power-law cutoff and exponentiated to give a lognormal distribution of…
Cluster Mass Functions in the Large and Small Magellanic Clouds: Fading and Size-of-Sample Effects
- D. Hunter, B. Elmegreen, T. Dupuy, M. Mortonson
- Physics
- 25 June 2003
The properties of ∼939 star clusters in the Large and Small Magellanic Clouds were determined from ground-based CCD images in UBVR passbands. The areal coverage was extensive, corresponding to 11.0…
Evolution of the Bar Fraction in COSMOS: Quantifying the Assembly of the Hubble Sequence
- K. Sheth, D. Elmegreen, A. West
- Physics
- 24 October 2007
We have analyzed the redshift-dependent fraction of galactic bars over 0.2 < z < 0.84 in 2157 luminous face-on spiral galaxies from the COSMOS 2 deg2 field. Our sample is an order of magnitude larger…
Star Formation Properties of a Large Sample of Irregular Galaxies
- D. Hunter, B. Elmegreen
- Physics
- 12 August 2004
We present the results of Hα imaging of a large sample of irregular galaxies. Our sample includes 94 galaxies with morphological classifications of Im, 26 blue compact dwarfs (BCDs), and 20 Sm…
Interstellar Turbulence I: Observations and Processes
- B. Elmegreen, John Scalo Ibm T.J. Watson Research Center, D. O. Astronomy, U. Texas
- Physics
- 22 April 2004
▪ Abstract Turbulence affects the structure and motions of nearly all temperature and density regimes in the interstellar gas. This two-part review summarizes the observations, theory, and…
A Universal Formation Mechanism for Open and Globular Clusters in Turbulent Gas
- B. Elmegreen, Y. Efremov
- Physics
- 1 May 1997
A universal mechanism for cluster formation in all epochs and environments is found to be consistent with the properties and locations of young and old globular clusters, open clusters and unbound…
A pressure and metallicity dependence for molecular cloud correlations and the calibration of mass
- B. Elmegreen
- Physics
- 1 March 1989
The correlation of molecular cloud mass with the fourth power of the velocity dispersion, the square of the radius, and the inverse of the density squared is addressed using a modified version of the…
Star Formation from Galaxies to Globules
- B. Elmegreen
- Physics
- 1 December 2001
The origin of the empirical laws of galactic scale star formation is considered in view of the self-similar nature of interstellar gas and the observation that most local clusters are triggered by…
The largest molecular cloud complexes in the first galactic quadrant
- T. Dame, B. Elmegreen, R. Cohen, P. Thaddeus
- Physics
- 1 June 1986
The CO emission within a few kiloparsecs of the Sun is dominated by a small number of very large molecular complexes, including those associated with the Orion Nebula (Thaddeus 1982), M16 and M17…
Sequential formation of subgroups in OB associations
- B. Elmegreen, C. Lada
- Physics
- 1 June 1977
We reconsider the structure and formation of OB association in view of recent radio and infrared observations of the adjacent molecular clouds. As a result of this reexamination, we propose that OB…
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