Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-02
Astrophys.J.656:84-92,2007
Astronomy and Astrophysics
Astrophysics
Submitted to ApJ on 7 April 2006, but still awaiting referee's report; 8 pages, 4 figures, uses emulateapj5.sty
Scientific paper
10.1086/509064
We present a pilot study of the X-ray properties of intermediate-mass (~10^5-10^6 M_sun) black holes in active galaxies using the Chandra X-ray telescope. Eight of the 10 active galaxies are detected with a significance of at least 3 sigma, with X-ray luminosities in the range L_(0.5-2 keV) ~ 10^41-10^43 ergs/s. The optical-to-X-ray flux ratios are consistent with expectations, given the known correlations between alpha_ox and ultraviolet luminosity, while a couple of objects appear to be anomalously X-ray weak. The range of 0.5--2 keV photon indices we measure, 1 < Gamma_s < 2.7, is entirely consistent with values found in samples of more luminous sources with more massive black holes. Black hole mass evidently is not a primary driver of soft X-ray spectral index. On the other hand, we do find evidence for a correlation between X-ray power-law slope and both X-ray luminosity and Eddington ratio, which may suggest that X-ray emission mechanisms weaken at high Eddington ratio. Such a weakening may explain the X-ray weakness of one of our most optically luminous objects.
Greene Jenny E.
Ho Luis C.
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