On the Narrowline Regions of Quasars

Details On the Narrowline Regions of Quasars On the Narrowline Regions of Quasars

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.276.1409j&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 276, NO. 4/OCT15, P.1409, 1995

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Scientific paper

High-quality spectra of low-redshift radio-loud quasars are presented. Methods of deblending the narrow and broad lines from each other are presented and their reliability discussed. There is evidence that the narrow-line Balmer decrement in quasars is somewhat above 3. This may indicate contributions either from collisional effects or from dust mixed into the narrow-line region. Less compelling evidence that broad- and narrow-line decrements may correlate suggests that dust is responsible. Quasars tend to have slightly lower narrow-line decrement values than radio galaxies, although the difference is not very significant and a slight tendency towards lower Hα/[NII] ratios. The spectra are also compared with high-quality spectra taken several years ago. One object, 1028+313, has varied significantly: its continuum flux has decreased and this has resulted in the disappearance of a small bump on the blue wing, the rest of the line remaining constant. This argues against simple disc models for the broad-line emission in this object.

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