On the wings of broad Hα emission in active galactic nuclei.

Details On the wings of broad Hα emission in active galactic nuclei. On the wings of broad Hα emission in active galactic nuclei.

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.279..165r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. Vol. 279, No. 1, p. 165 - 170

Astronomy and Astrophysics

Astronomy

15

Line: Formation -- Line: Profiles -- Galaxies: Nuclei -- Quasars: Emission Lines -- Galaxies: Seyfert, Active Galactic Nuclei: Line Formation, Active Galactic Nuclei: H Alpha

Scientific paper

The wings of broad emission lines in active galactic nuclei (AGN) arise from matter moving at extreme velocities. The authors use a large sample (≍100 spectra) of Hα emission line profiles to study the curvature and asymmetry properties of the broad-line wings. The sample is strongly weighted towards radio-loud objects (4 to 1). The study includes a comparison of the red- and blue-wing fits for each object. The authors compare the results with the predictions of various models for the broad-line region (BLR). Profile velocity displacements are common in the sample with almost equal numbers of red- and blueshifts observed at zero intensity. The authors find that approximately half the objects show different (i.e. log-like or power-law) fits to the red and blue wings. This population strongly favours power-law fits on the blue and log fits on the red side. This may be evidence for multiple BLR emission components with fundamentally different velocity distributions in these objects. Among the objects where both wings are fitted by the same function the authors find equal numbers with matching log and power-law fits. The power-law fitted profiles tend to be narrower and more blueshifted than the log fitted ones in the matched fitted samples.

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