Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pnaoc...2...75h&link_type=abstract
Astronomical Research and Technology. Publications of National Astronomical Observatories of China (ISSN 1672-7673), Vol. 2, No.
Astronomy and Astrophysics
Astronomy
Active Galactic Nuclei, Continuum, Big Blue Bump, Accretion Disk
Scientific paper
Based on the nuclear magnitude in the optical, inferred from the decomposition of the high-resolution optical image of HST WFPC1/2, and the ultraviolet flux, observed by IUE, the power law spectral index (α) (Fν~ν-α) of Big Blue Bump (BBB) emission is measured for the Seyfert galactic nuclei. The average value of them is -0.55, less than the value of composite spectral index (0.46) of SDSS, close to the expected value (-0.3) of the spectral index for classic accretion disk emission in the same spectral region. Compared to the αT, the BBB spectral index, measured from the total emission of galaxy, the above index α has a lower value for most Seyfert objects in our sample, although still with a wider distribution. Additionally, we conjecture that some type II Seyfert objects have abnormal decrease, compared to type I, due to the ultraviolet emission of galactic disk without proper deduction from the total galactic emission.
Huang Shuang-An
Wang Ting-Gui
Zhou You-Yuan
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