The HST quasar absorption line key project. 9: an emission-line study of PG 2251+113

Details The HST quasar absorption line key project. 9: an emission-line study of PG 2251+113 The HST quasar absorption line key project. 9: an emission-line study of PG 2251+113

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...434..484e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 434, no. 2, p. 484-492

Astronomy and Astrophysics

Astronomy

11

Absorption Spectra, Emission Spectra, Forbidden Bands, Line Shape, Quasars, Ultraviolet Astronomy, Ultraviolet Spectra, Visible Spectrum, Astronomical Models, Carbon, Computerized Simulation, Hubble Space Telescope, Iron, Neon, Oxygen

Scientific paper

We present Hubble Space Telescope (HST) and quasi-simultaneous ground-based observations of the z = 0.3252 QSO PG 2251+113. We find a correlation between line widths and the critical density for de-excitation of the forbidden emission lines observed in this object. We can show that this correlation also applies to the semiforbidden and possibly also the permitted lines which arise in the broad emission-line region. While this result was predicted from statistical studies, it has never previously been shown to hold in detail in any individual object. This relationship between the narrow and broad emission-line regions may help constrain dynamical models of both regions. We examine the implications of this result for a simple radial infall model of the emitting gas developed to explain the origin of narrow-line profiles.

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