The Velocity Field of Quasar Broad Emission Line Gas | Zendy

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The Velocity Field of Quasar Broad Emission Line Gas

Author(s) -

Brian Punsly

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/512968

Subject(s) - quasar , qsos , physics , superluminal motion , astrophysics , jet (fluid) , line of sight , line (geometry) , emission spectrum , astronomy , galaxy , spectral line , mechanics , geometry , mathematics

In this Letter, the broad emission line (BEL) profiles of superluminalquasars with apparent jet velocities, $\beta_{a}>10$, (ultraluminal QSOs, orULQSOs hereafter) are studied as a diagnostic of the velocity field of the BELemitting gas in quasars. The ULQSOs are useful because they satisfy a verystrict kinematical constraint, their parsec scale jets must be propagatingwithin $12^{\circ}$ of the line of sight. We know the orientation of theseobjects with great certainty. The large BEL FWHM, $\sim 3,000 \mathrm{km/s} -6,000 \mathrm{km/s}$, in ULQSOs tend to indicate that the BEL gas has a largercomponent of axial velocity (either random or in a wind) along the jetdirection than previously thought.Comment: To appear in ApJ Letter

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