The Velocity Field of Quasar Broad Emission Line Gas
نویسنده
چکیده
In this Letter, the broad emission line (BEL) profiles of superluminal quasars with apparent jet velocities, βa > 10, (ultraluminal QSOs, or ULQSOs hereafter) are studied as a diagnostic of the velocity field of the BEL emitting gas in quasars. The ULQSOs are useful because they satisfy a very strict kinematical constraint, their parsec scale jets must be propagating within 12◦ of the line of sight. We know the orientation of these objects with great certainty. The large BEL FWHM, ∼ 3, 000 km/s− 6, 000 km/s, in ULQSOs tend to indicate that the BEL gas has a larger component of axial velocity (either random or in a wind) along the jet direction than previously thought. Subject headings: quasars: general — galaxies: active — accretion, accretion disks — black hole physics
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