Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541125b&link_type=abstract
American Astronomical Society, AAS Meeting #215, #411.25; Bulletin of the American Astronomical Society, Vol. 42, p.244
Astronomy and Astrophysics
Astronomy
Scientific paper
Blueshifted Broad Absorption Lines (BALs) from medium ionization species such as C IV, N V, and O VI are often observed in the rest-frame UV spectra of AGN. Their presence is indicative of an outflow that can reach speeds of up to 50,000 km/s. A subset of BALQSOs also shows, in spectral proximity to their broad troughs, complexes of narrower (of the order of a few hundred km/s) absorption features from low ionization species (LoBAL), e.g., Mg II, Al II, Si II, Fe II. We have studied the physical conditions of the multiple components in the LoBAL of two quasars. Further, we propose an analytic model that describes the nature of the multiple kinematic components. It is argued that the basic structure is that of a single main large and dense cloud traveling away from and within the line of sight of the central ionizing source. The intrinsic variability of the photoionizing flux from the central engine leads to the formation of ionization fronts that sweep supersonically through the cloud and create strong magneto-hydro shocks. Our model makes various observable predictions that are well supported by current observations.
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