scholarly journals THE X-RAY POWER SPECTRAL DENSITY FUNCTION AND BLACK HOLE MASS ESTIMATE FOR THE SEYFERT ACTIVE GALACTIC NUCLEUS IC 4329a

2009 ◽  
Vol 698 (2) ◽  
pp. 1740-1748 ◽  
Author(s):  
A. Markowitz
Keyword(s):  
Black Hole ◽  
Spectral Density ◽  
Density Function ◽  
Active Galactic Nucleus ◽  
Spectral Density Function ◽  
Black Hole Mass ◽  
Power Spectral Density Function ◽  
X Ray ◽  
Power Spectral ◽  
Mass Estimate

Spectral analysis of palaeomagnetic time series and the geomagnetic spectrum

1982 ◽  
Vol 306 (1492) ◽  
pp. 203-209 ◽  
Keyword(s):  
Time Series ◽  
Spectral Analysis ◽  
Spectral Density ◽  
Density Function ◽  
Power Density ◽  
Spectral Density Function ◽  
Power Spectral Density Function ◽  
Power Spectral ◽  
Polarity Reversals ◽  
The Continuum

There are now sufficient archaeomagnetic data from rapidly deposited sediments and baked clays to start bridging the gap in the geomagnetic spectrum between the frequency ranges covered by observatory records and polarity reversals. The form of the continuum spectrum of internal origin can be only loosely constrained but is broadly consistent with earlier speculations. The power spectral density function appears to increase rapidly with period up to periods of about 60 years, then more slowly up to a plateau in the region of 10 4 to 10 5 years, and thereafter starts to fall. There is somewhat inconclusive evidence for a drop in power density at periods around 10 2 years. Prospects for refining the spectrum are excellent.

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