Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..348..519c&link_type=abstract
Astrophysics in the Far Ultraviolet: Five Years of Discovery with FUSE ASP Conference Series, Vol. 348, Proceedings of the Confe
Astronomy and Astrophysics
Astrophysics
Scientific paper
The technique of adjacent pixel-to-pixel log-brightness variation, as applied by us on the recent Hubble space telescope image of very distant (ultra deep field) objects, is applied to objects studied by FUSE (the Far Ultraviolet Spectroscopic Explorer mission). The local surface brightness fluctuation spatial profiles of AGN (Active Galactic Nuclei) and Black Hole objects suggest that large fluctuations across the disk are consistent with dark matter. The luminosity-mass relation suggests a high accretion rate. Larger fluctuation in the central core was correlated with young stars, as determined by FUSE. The corresponding local log-mass variation has a Gaussian-like distribution. The random nature of the accretion of the material, with collisions, led to a random-walk motion, and therefore this distribution. The long tail in the distribution correlated with high outflow speed, as measured by FUSE. Distribution width variation appears related to AGN or black hole presence, and to metallicity. The fractal dimensions calculated from local surface brightness fluctuations were about 2.3, suggesting a consistent origin of the random motion. This local surface brightness fluctuation technique could be useful for selecting potential targets in the Hubble database for future FUSE and other spectroscopic measurements.
Cheung Teddy
Cotten David
Johnson Laura L.
Kaufman Sam
Marchese P.
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