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44 papers · 1 filter
High Velocity Rain: The Terminal Velocity of Model of Galactic Infall
Robert A. Benjamin, Laura Danly
A model is proposed for determining the distances to falling interstellar clouds in the galactic halo by measuring the cloud velocity and column density and assuming a model for th…
UIT Astro-2 Observations of NGC 4449
Robert S. Hill, Michael N. Fanelli, Denise A. Smith +2
The bright Magellanic irregular galaxy NGC 4449 was observed by the Ultraviolet Imaging Telescope (UIT) during the Astro-2 Spacelab mission in March, 1995. Far ultraviolet (FUV) im…
Ultraviolet Signatures of Tidal Interaction in the Giant Spiral Galaxy, M101
William H. Waller, Ralph C. Bohlin, Robert H. Cornett +10
We present new evidence for tidal interactions having occurred in the disk of M101 in the last 10^8 - 10^9 years. Recent imaging of the far-ultraviolet emission from M101 by the Sh…
Cosmic Star Formation History
Piero Madau
I review some recent progress made in our understanding of galaxy evolution and the cosmic history of star formation. Like bookends, the results obtained from deep ground-based spe…
X-ray variability in M87
D. E. Harris, J. A. Biretta, W. Junor
We present the evidence for X-ray variability from the core and from knot A in the M87 jet based on data from two observations with the Einstein Observatory High Resolution Imager…
The X-ray off-state of the supersoft source CAL 83 and its interpretation
C. Alcock et al
We consider simultaneous optical data obtained during the recent X-ray turn-off of CAL83. Combining the optical behaviour with the observed X-ray decay time, we show that a model o…