H0 from reverberations in an irradiated accretion disc

Details H0 from reverberations in an irradiated accretion disc H0 from reverberations in an irradiated accretion disc

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..431..231c&link_type=abstract

Accretion processes in astrophysical systems: Some like it hot! - eigth astrophysics conference. AIP Conference Proceedings, Vo

Astronomy and Astrophysics

Astrophysics

Observational Cosmology, Infall, Accretion, And Accretion Disks, Active And Peculiar Galaxies And Related Systems

Scientific paper

We show how wavelength-dependent time delays observed in AGN variability studies can be used to test the accretion disc model by mapping the disc temperature profile T(R) and determine Hubble's constant, H0. X-ray reprocessing in a steady-state blackbody accretion disc model with T4~MṀR-3 incurs a wavelength-dependent light travel time delay τ~(MṀ)1/3λ4/3. Optical continuum variations in NGC 7469 lag those at 1315 Å by about 1 day at 4800 Å to about 2 days at 7500 Å. The time delays are consistent with a T~R-3/4 structure. The spectral energy distribution fν~cos i(H0/z)2(MṀ)2/3λ-1/3 agrees with the dereddened variable component of the UV/optical continuum fluxes if H0(cos i/cos 60°)1/2=60+/-5 km s-1 Mpc-1.

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