ORCID Profile
0000-0002-6633-7891
Current Organisation
Gemini Observatory, NSF's NOIRLab
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Publisher: Cambridge University Press (CUP)
Date: 2017
DOI: 10.1017/PASA.2017.37
Abstract: The structure and kinematics of the broad line region in quasars are still unknown. One popular model is the disk-wind model that offers a geometric unification of a quasar based on the viewing angle. We construct a simple kinematical disk-wind model with a narrow outflowing wind angle. The model is combined with radiative transfer in the Sobolev, or high velocity, limit. We examine how angle of viewing affects the observed characteristics of the emission line. The line profiles were found to exhibit distinct properties depending on the orientation, wind opening angle, and region of the wind where the emission arises. At low inclination angle (close to face-on), we find that the shape of the emission line is asymmetric, narrow, and significantly blueshifted. As the inclination angle increases (close to edge-on), the line profile becomes more symmetric, broader, and less blueshifted. Additionally, lines that arise close to the base of the disk wind, near the accretion disk, tend to be broad and symmetric. Single-peaked line profiles are recovered for the intermediate and equatorial wind. The model is also able to reproduce a faster response in either the red or blue sides of the line profile, consistent with reverberation mapping studies.
Publisher: SPIE
Date: 06-07-2018
DOI: 10.1117/12.2314418
Publisher: Oxford University Press (OUP)
Date: 11-07-2011
Publisher: American Astronomical Society
Date: 28-10-2015
Publisher: American Astronomical Society
Date: 03-09-2019
Publisher: Oxford University Press (OUP)
Date: 06-07-2018
Publisher: Oxford University Press (OUP)
Date: 11-06-2018
Publisher: EDP Sciences
Date: 30-09-2013
Publisher: American Astronomical Society
Date: 09-10-2023
Publisher: Oxford University Press (OUP)
Date: 04-11-2019
Abstract: Since the discovery of active galactic nuclei (AGN) and their subclasses, a unification scheme of AGN has been long sought. Orientation-based unified models predict that some of the ersity within AGN subclasses can be explained by the different viewing angles of the observer. Several orientation categorisations have been suggested, but a widely applicable measure has yet to be found. Using the properties of the ultraviolet and optical broad emission lines of quasars, in particular the velocity offsets and line widths of high-ionisation C iv and low-ionisation Mg ii lines, a correlation has been measured. It is postulated that this correlation is due to the viewing angle of the observer. Comparison with other orientation tracers shows consistency with this interpretation. Using a simulation of a wide angle disk-wind model for the broad emission line region, we successfully replicate the observed correlation with inclination. Future more detailed modelling will not only enable improved accuracy in the determination of the viewing angle to in idual AGN, but will also substantially increase our understanding of the emitting regions of AGN.
Publisher: Oxford University Press (OUP)
Date: 09-10-2018
No related grants have been discovered for Kathleen Labrie.