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Testing for x-ray periodicities in seyfert galaxies
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Halpern, Jules P. |
| Copyright Year | 2002 |
| Description | The Deep Survey instrument on the Extreme Ultraviolet Explorer obtained long, continuous light-curves of 10 Seyfert galaxies with durations of 5-33 days each. We present a uniform reduction of these data, which account for a total of 209 days of observation. Several of the light curves are uniquely suited to a search for periodicity or QPOs in the range of hours to days that might be expected from dynamical effects in the inner accretion disks around approximately 10(exp 8) solar mass black holes. Power spectra show features in three of the longest observations that could be transient periods: 0.9 days in RX J0437.4-4711, 2.1 days in Ton S180, and 5.8 days in 1H 0419-577. These period values seem to be unrelated to the length of the observations, which are similar in the three cases, but they do roughly scale as the luminosity of the objects, which would be expected in a dynamical scenario if the black hole masses also scale with luminosity. The significance of these periods will be evaluated in a future publication by using the method of Timmer & Konig (1995), which properly takes into account the red-noise properties of AGN light curves. |
| File Size | 843786 |
| Page Count | 20 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20020058226 |
| Archival Resource Key | ark:/13960/t3b043s75 |
| Language | English |
| Publisher Date | 2002-06-01 |
| Access Restriction | Open |
| Subject Keyword | Astrophysics Seyfert Galaxies Extreme Ultraviolet Explorer Satellite Light Curve X Ray Astronomy Accretion Disks Stellar Luminosity X Ray Sources Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
