Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998nasa.reptv....h&link_type=abstract
Technical Report, NASA/CR-1998-207611; NAS 1.26:207611; CAL-2798 Columbia Astrophysics Lab.
Astronomy and Astrophysics
Astronomy
Seyfert Galaxies, Light Curve, Stellar Mass, Calibrating, Black Holes (Astronomy), Accretion Disks, Variability, X Rays, Toruses, Broadband, Reverberation, Targets
Scientific paper
The ten monitoring observations of Mrk 509 were made successfully between October 20 and November 26 last year. These observations were simultaneously with RXTE observations. A preliminary analysis of the RXTE observations has been done, and the light curve is shown in figure 1. Our aim in this experiment is to determine the location of the emission region of the reflection component by reverberation mapping. This component could be emitted from the accretion disk, within 100 Scwartzschild radii (Rs) from the source. Note that the monitoring interval of 2.5 days corresponds to 100 Rs for a 2 x 108 solar mass black hole, which may be appropriate for this luminous object. In that case, we would expect the reflected component to vary along the direct flux, and there should be no spectral variability between observations. Alternatively, the reflected emission could come from the molecular torus, several parsecs from the nucleus. In that case, the reflection component flux should not vary. The light curve in figure 1 shows that during the monitoring period, the target varied in an ideal way, since significant variability was observed between observations and yet the most rapid variability is apparently sampled. The analysis of this data is not yet completed. The measurement of the reflection component in the combined ASCa and RXTE spectra depends critically on the RXTE background subtraction and calibration, but these have not yet progressed to the point where the analysis can be done.
Halpern Jules P.
Leighly Karen M.
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