X-Ray Spectrum of a Narrow Line Quasi-Stellar Object

Details X-Ray Spectrum of a Narrow Line Quasi-Stellar Object X-Ray Spectrum of a Narrow Line Quasi-Stellar Object

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996cuny.reptr....h&link_type=abstract

Technical Report, Columbia Univ. New York, NY United States Astrophysics Lab.

Astronomy and Astrophysics

Astronomy

X Ray Sources, Quasars, Pulsars, Seyfert Galaxies, Emission Spectra, X Ray Astronomy, X Ray Spectroscopy, X Rays, H Alpha Line, Infrared Astronomy Satellite

Scientific paper

This AO-3 observation of a new narrow-line QSO was motivated by our extensive study of the unclassified X-ray sources from the ROSAT/IRAS survey of Boller et al. IRAS 2018.1-2244 was observed to have Balmer lines and forbidden lines of roughly equal width. There are possibly weak broad wings on the H-alpha line. One of the questions to be addressed by hard X-ray spectroscopy is whether or not these wings are to be interpreted as scattered or weakly transmitted flux from a hidden broad-line region. The optical spectrum of this QSO also has very weak permitted Fe II lines, possibly indicative of a hidden broad line region. A new wrinkle on the concept of the narrow-line QSO is the gradual realization that luminous objects with very strong but narrow Fe II lines are showing up preferentially in soft X-ray surveys. The AO-1 objective was to detect the Geminga Pulsar and to interpret its 2-10 keV spectrum and pulse profile in terms of its X-ray emission spectra. Also, the AO-1 observed the Seyfert galaxy NGC 3516 to obtain a high signal-to-noise ratio spectrum. We expected NGC 3516 to be one of the best candidates for a successful demonstration of the details of the warm-absorber model.

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