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A Fractal Origin for the Mass Spectrum of Interstellar Clouds: II. Cloud Models and Power Law Slopes
B. G. Elmegreen
Three-dimensional fractal models on grids of 200**3 pixels are generated from the inverse Fourier transform of noise with a power law cutoff, exponentiated to give a log normal dis…
Dusty Acoustic Turbulence in the Nuclear Disks of two LINER Galaxies NGC 4450 and NGC 4736
D. M. Elmegreen, B. G. Elmegreen, K. S. Eberwein
The structure of dust spirals in the nuclei of the SAab-type Liner galaxies NGC 4450 and NGC 4736 is studied using archival HST PC images. The spirals are typically only several hu…
Compact Star Clusters in Nearby Dwarf Irregular Galaxies
Olivia H. Billett, Deidre A. Hunter, Bruce G. Elmegreen
Nearby dwarf irregular galaxies were searched for compact star clusters using data from the HST archives. Three of the galaxies were found to host both populous clusters (M_V<-9.5…
CO Observations of the Interacting Galaxy Pair NGC 5394/95
Michele Kaufman, Kartik Sheth, Curtis Struck +4
BIMA CO 1-0 observations are presented of the spiral galaxies NGC 5394 and NGC 5395 that have undergone a recent, grazing encounter. In NGC 5394, 80% of the CO emission detected by…
Hubble Space Telescope imaging of a peculiar stellar complex in NGC 6946
S. S. Larsen, Yu. N. Efremov, B. G. Elmegreen +4
The stellar populations in a stellar complex in NGC 6946 are analyzed on images taken with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope. The complex is pec…
Theory of star formation in the central kiloparsec
Bruce G. Elmegreen
Star formation by gravitational instabilities, sequential triggering, and turbulence triggering are briefly reviewed in order to compare the various mechanisms that are observed in…
History of Star Formation in the Universe
Bruce G. Elmegreen
The cosmic history of star formation is briefly reviewed, starting with the Milky Way and then discussing observations relevant to the closed box and hierarchical build-up models.…
Triggering the Formation of Young Clusters
B. G. Elmegreen
Star formation is triggered in essentially three ways: (1) the pressures from existing stars collect and squeeze nearby dense gas into gravitationally unstable configurations, (2)…
Penetrating the Mask: The Gravitational Torque of Bars
D. L. Block, R. Buta, I. Puerari +4
The Hubble classification scheme of galaxies is based on blue-light appearance. Atlases reveal the rich variety of responses of the Population I component (the "mask") of gas and d…
The gravitational torque of bars in optically unbarred and barred galaxies
D. L. Block, I. Puerari, J. H. Knapen +4
The relative bar torques for 45 galaxies observed at - band with the 4.2m William Herschel Telescope are determined by transforming the light distributions into potentials and d…
Structure and Mass of a Young Globular Cluster in NGC 6946
S. S. Larsen, J. P. Brodie, B. G. Elmegreen +3
Using the Wide Field Planetary Camera 2 on board the Hubble Space Telescope, we have imaged a luminous young star cluster in the nearby spiral galaxy NGC 6946. The cluster has an a…
Neutral Hydrogen and Star Formation in the Irregular Galaxy NGC 2366
D. A. Hunter, B. G. Elmegreen, H. van Woerden
We present UBVJHKHalpha and HI data of the irregular galaxy NGC 2366. It is a normal boxy-shaped disk seen at high inclination angle. We do not see any unambiguous observational si…