THE STRUCTURE OF HE 1104-1805 FROM INFRARED TO X-RAY
- Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States)
- Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019 (United States)
- Department of Physics and Astronomy, College of Charleston, Charleston, SC 29424 (United States)
The gravitationally lensed quasar HE 1104-1805 has been observed at a variety of wavelengths ranging from the mid-infrared to X-ray for nearly 20 yr. We combine flux ratios from the literature, including recent Chandra data, with new observations from the SMARTS telescope and Hubble Space Telescope, and use them to investigate the spatial structure of the central regions using a Bayesian Monte Carlo analysis of the microlensing variability. The wide wavelength coverage allows us to constrain not only the accretion disk half-light radius r {sub 1/2}, but the power-law slope ξ of the size-wavelength relation r {sub 1/2}∝λ{sup ξ}. With a logarithmic prior on the source size, the (observed-frame) R-band half-light radius log (r {sub 1/2}/cm) is 16.0{sub {sup −}{sup 0}{sup .}{sup 4{sub +}{sub 0}{sub .}{sub 3}}}, and the slope ξ is 1.0{sub {sup −}{sup 0}{sup .}{sup 5}{sup 6{sub +}{sub 0}{sub .}{sub 3}{sub 0}}}. We put upper limits on the source size in soft (0.4–1.2 keV) and hard (1.2–8 keV) X-ray bands, finding 95% upper limits on log (r {sub 1/2}/cm) of 15.33 in both bands. A linear prior yields somewhat larger sizes, particularly in the X-ray bands. For comparison, the gravitational radius, using a black hole mass estimated using the Hβ line, is log (r{sub g} /cm) = 13.94. We find that the accretion disk is probably close to face-on, with cos i = 1.0 being four times more likely than cos i = 0.5. We also find probability distributions for the mean mass of the stars in the foreground lensing galaxy, the direction of the transverse peculiar velocity of the lens, and the position angle of the projected accretion disk's major axis (if not face-on)
- OSTI ID:
- 22364647
- Journal Information:
- Astrophysical Journal, Vol. 798, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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