The emission-line properties on low-redshift QSOs: What physical parameters drive the observed properties?

Details The emission-line properties on low-redshift QSOs: What physical parameters drive the observed properties? The emission-line properties on low-redshift QSOs: What physical parameters drive the observed properties?

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..584b&link_type=abstract

Testing the AGN paradigm. AIP Conference Proceedings, Volume 254, pp. 584-587 (1992).

Physics

1

Visible

Scientific paper

Spectra of the Hβ-[O III]-Fe II region have been obtained of all 87 PG QSOs having redshifts less than 0.5. An empirical technique has been used to measure and subtract the Fe II emission in this region. Measurements of a number of emission line properties have been combined with continuum information from the literature to try to understand how these properties are related. Most of the variance is connected to two sets of correlations, the first involving the strengths of Fe II and [O III], and the asymmetry and width of the Hβ line. The second group of correlations includes the optical luminosity, the strength of He II λ4686, and αox. Among the conclusions we draw from this analysis are: 1) The dominant source of variation in the observed properties of low redshift QSOs is a physical parameter (perhaps L/LEdd) which balances Fe II excitation against the illumination of the narrow line region. We argue that this proper (and the observed properties of QSOs in general) is not driven by external orientation, i.e., our viewing angle. 2) A comparison of subsamples defined by radio properties suggests that radio quiet and radio loud objects cannot be parallel sequences because there is a large deficit of radio quiet analogs to the steep spectrum QSOs. Instead, radio loud objects should be though of as the extreme end of some (unknown) property which also determines Fe II and [O III] strength.

Affiliated with

Also associated with

No associations

Rating

The emission-line properties on low-redshift QSOs: What physical parameters drive the observed properties? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The emission-line properties on low-redshift QSOs: What physical parameters drive the observed properties?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The emission-line properties on low-redshift QSOs: What physical parameters drive the observed properties? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1513863