Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-09
Mon.Not.Roy.Astron.Soc.369:182-188,2006
Astronomy and Astrophysics
Astrophysics
7 pages, 3 figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.10295.x
In this paper we report new evidence that measurements of the broad-line widths in quasars are dependent on the source orientation, consistent with the idea that the broad-line region is flattened or disc-like. This reinforces the view derived from radio-selected samples, where the radio-core dominance has been used as a measure of orientation. The results presented here show a highly significant (>99.95%) correlation between radio spectral index (which we use as a proxy for source orientation) and broad-line width derived from the H-beta and MgII emission lines. This is the first time that this type of study has used quasars derived from a large optically selected quasar sample, where the radio-loud quasars (RLQs) and radio-quiet quasars (RQQs) have indistinguishable distributions in redshift, bolometric luminosity and colour, and therefore overcomes any biases which may be present in only selecting via radio emission. We find that the mean FWHM for the flat-spectrum radio-loud quasars (FSQs) to be
Jarvis Matt J.
McLure Ross J.
No associations
LandOfFree
Orientation dependency of broad-line widths in quasars and consequences for black-hole mass estimation 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 Orientation dependency of broad-line widths in quasars and consequences for black-hole mass estimation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Orientation dependency of broad-line widths in quasars and consequences for black-hole mass estimation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-710730