Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7360l&link_type=abstract
HST Proposal ID #7360
Other
Hst Proposal Id #7360 Agn/Quasars
Scientific paper
Recent ASCA X-ray spectra of several narrow-line Seyfert 1 galaxies {NLS1s} show a feature near 1 keV that can be described as an absorption edge. If it is due to ionized oxygen, the principal absorber in the X-ray spectra of broad- line Seyfert 1s, a blueshift of 0.2-0.3 c is implied. This is reminiscent of the UV absorption lines seen in broad absorption line quasars {BALQSOs}. To investigate this possible connection, we propose to obtain UV spectra to search for blueshifted absorption lines in two of the NLS1s that show the X-ray absorption feature, IRAS 13224-3809 and H0707-495. NLS1s are bright X-ray sources, while BALQSOs are quite weak, but evidence points toward extreme X-ray absorption in the latter. Discovery of absorption lines in the UV spectra of NLS1s would demonstrate a continuity between NLS1s and BALQSOs that is based upon the degree of absorption. Hints of a relationship are already present in terms other properties shared by both classes, including strong or extreme Fe II emission, weak [O III] emission, red optical continua, and strong infrared emission. If we can establish the existence of BALs in NLS1s, we can use them to address open questions such as: Is the continuum of BALQSOs intrinsically red? Why is extreme ionFe2 emission found preferentially in NLS1s and BALQSOs? What is the origin of the remarkable X-ray variability of NLS1s, and what is its effect upon the BALs?
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