Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf..104e&link_type=abstract
In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 104-105 (SEE N93-26706 10-90)
Astronomy and Astrophysics
Astronomy
Astronomical Catalogs, Galactic Evolution, Statistical Correlation, Stellar Luminosity, Galaxies, Null Hypothesis, Rank Tests, X Ray Astronomy
Scientific paper
The EINSTEIN galaxy catalog contains x-ray data for 148 early-type (E and SO) galaxies. A detailed analysis of the global properties of this sample are studied. By comparing the x-ray properties with other tracers of the ISM, as well as with observables related to the stellar dynamics and populations of the sample, we expect to determine more clearly the physical relationships that determine the evolution of early-type galaxies. Previous studies with smaller samples have explored the relationships between x-ray luminosity (L(sub x)) and luminosities in other bands. Using our larger sample and the statistical techniques of survival analysis, a number of these earlier analyses were repeated. For our full sample, a strong statistical correlation is found between L(sub X) and L(sub B) (the probability that the null hypothesis is upheld is P less than 10(exp -4) from a variety of rank correlation tests. Regressions with several algorithms yield consistent results.
Eskridge Paul B.
Fabbiano Giuseppina
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