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Article overview
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X-Ray and Optical Microlensing in the Lensed Quasar PG 1115+080 | | Christopher W. Morgan
; Christopher S. Kochanek
; Xinyu Dai
; Nicholas D. Morgan
; Emilio E. Falco
; | | Date: |
8 Feb 2008 | | Abstract: | We analyzed the microlensing of the X-ray and optical emission of the lensed
quasar PG 1115+080. We find that the effective radius of the X-ray emission is
1.2 (+0.7-0.4) dex smaller than that of the optical emission. Viewed as a thin
disk observed at inclination angle i, the optical accretion disk has a scale
length, defined by the point where the disk temperature matches the rest frame
energy of the monitoring band (kT=hc/lambda_rest with lambda_rest = 0.3
micron), of log[(r_{s,opt}/cm)(cos(i)/ 0.5)^{1/2}] = 16.2 pm 0.3. The X-ray
emission region (1.4-21.8 keV in the rest frame) has an effective half-light
radius of log[r_{1/2,X}/cm] = 15.3 (+0.5 -0.6). Given an estimated black hole
mass of 1.23 * 10^9 M_sun, corresponding to a gravitational radius of
log[r_g/cm] = 14.3, the X-ray emission is generated near the inner edge of the
disk while the optical emission comes from scales slightly larger than those
expected for an Eddington-limited thin disk. We find a weak trend supporting
models with low stellar mass fractions near the lensed images, in mild
contradiction to inferences from the stellar velocity dispersion and the time
delays. | | Source: | arXiv, 0802.1210 | | Services: | Forum | Review | PDF | Favorites | |
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