A Hidden Power Source in the QSO PG 1630+377

Details A Hidden Power Source in the QSO PG 1630+377 A Hidden Power Source in the QSO PG 1630+377

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6618g&link_type=abstract

HST Proposal ID #6618

Physics

Hst Proposal Id #6618 Agn

Scientific paper

Previous {Cycle 3} FOS polarimetry of the QSO PG 1630+377 has shown a steep rise in polarization well shortward of the redshifted Lyman edge {912 Angstrom}. The high polarizations seen at the shortest wavelengths, P 20%, {.} probably indicate that we are seeing scattering of some hidden source. Any direct light from the source would dilute the polarization from the scattering region to much lower levels. For this hidden source to be so bright as seen only through scattering indicates that it may be intrinsically the most significant power source shortward of the Lyman edge. In order to confirm and follow-up the FOS observations we will use the FOC to study three wavelength regions in PG 1630+377, including the important region below the short wavelength limit of the FOS data. The FOC is the only instrument capable of performing these measurements, since the G130H grating in the FOS will not be calibrated for polarimetry observations.

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