Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8109t&link_type=abstract
HST Proposal ID #8109
Physics
Hst Proposal Id #8109 Agn Physics
Scientific paper
The Seyfert 1 galaxy, TON S180, is the brightest AGN in the extreme UV regime, there is a low Galactic column along the line-of-sight and no evidence for intrinsic absorption. This offers a rare opportunity to obtain the spectral-energy- distribution {SED} of the source, including data from the vital soft X-ray to UV range which is generally difficult to observe due to absorption of those photons by Galactic material. TON S180 has a strong soft X-ray excess, and may be the best case in which to confirm the presence of a Big Blue Bump {BBB}. The existence of a BBB in the EUV continuum is extremely controversial. For example, although the SEDs derived from QSO spectra appear to be power-laws, photoionization models based on these fits greatly underpredict the strength of the He II emission lines. This apparent deficit of He II ionizing photons could be explained if a BBB were indeed present. We request a STIS observation of TON S180, to be made simultaneous with our approved AXAF and FUSE observations. The combined data will allow us to determine the SED and test the presence of a BBB, addressing the photon deficit problem in detail.
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