The X-ray Power Density Spectrum of 3C 120

Details The X-ray Power Density Spectrum of 3C 120 The X-ray Power Density Spectrum of 3C 120

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.4205m&link_type=abstract

American Astronomical Society Meeting 202, #42.05; Bulletin of the American Astronomical Society, Vol. 35, p.759

Astronomy and Astrophysics

Astronomy

Scientific paper

Using the Rossi X-ray Timing Explorer (RXTE), we have observed the broad-line radio galaxy (BLRG) 3C 120 quasi-continuously for a period of nine days. These high temporal frequency data, combined with previous observations spanning 2 years, have allowed us to construct the power density spectrum (PDS) for 3C 120. Spanning more than 4 decades in temporal frequency, this represents the first PDS for a radio-loud galaxy. We find the PDS shows a steep power law of slope ˜ 1.7 at high frequencies, flattening to a slope of ˜ 0.6 at low frequencies, with a break frequency of ˜ 4 x 10-7 Hz. This shape is very similar to that observed in galactic black hole binaries such as Cygnus X-1. We explore the relationship between break frequency and both black hole mass and luminosity, finding an estimated mass of log (M/Msun) ˜ 7.8 for the central compact object in 3C 120.

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