Population studies in groups and clusters of galaxies. III - A catalog of galaxies in five nearby groups

1990 ◽  
Vol 100 ◽  
pp. 1 ◽  
Author(s):  
Henry C. Ferguson ◽  
Allan Sandage
Keyword(s):  
Population Studies ◽  
Clusters Of Galaxies

Reflections on Local Population Studies and Social Science History

2018 ◽  
pp. 43-51
Author(s):  
Osamu Saito
Keyword(s):  
Social Science ◽  
Population Studies ◽  
Local Population ◽  
Local Source ◽  
Personal Reflection ◽  
Social Scientists ◽  
Science History ◽  
Social Science History ◽  
The Relationship ◽  
Source Materials

This personal reflection of more than 40 years' work on the supply of labour in a household context discusses the relationship between social science history (the application to historical phenomena of the tools developed by social scientists) and local population studies. The paper concludes that historians working on local source materials can give something new back to social scientists and social science historians, urging them to remake their tools.

Beyond the Schwarzschild Metric

2018 ◽  
Author(s):  
David M. Wittman
Keyword(s):  
Black Holes ◽  
General Relativity ◽  
Gravitational Waves ◽  
Test Particle ◽  
Direct Detection ◽  
Relativistic Effects ◽  
Big Bang ◽  
Clusters Of Galaxies ◽  
General Relativistic ◽  
The Universe

General relativity explains much more than the spacetime around static spherical masses.We briefly assess general relativity in the larger context of physical theories, then explore various general relativistic effects that have no Newtonian analog. First, source massmotion gives rise to gravitomagnetic effects on test particles.These effects also depend on the velocity of the test particle, which has substantial implications for orbits around black holes to be further explored in Chapter 20. Second, any changes in the sourcemass ripple outward as gravitational waves, and we tell the century‐long story from the prediction of gravitational waves to their first direct detection in 2015. Third, the deflection of light by galaxies and clusters of galaxies allows us to map the amount and distribution of mass in the universe in astonishing detail. Finally, general relativity enables modeling the universe as a whole, and we explore the resulting Big Bang cosmology.

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