Formation of P Cygni Line Profiles in Relativistically Expanding Atmospheres. II. The Effect of the Continuum Frequency Shape and Limb Darkening of the Core

Details Formation of P Cygni Line Profiles in Relativistically Expanding Atmospheres. II. The Effect of the Continuum Frequency Shape and Limb Darkening of the Core Formation of P Cygni Line Profiles in Relativistically Expanding Atmospheres. II. The Effect of the Continuum Frequency Shape and Limb Darkening of the Core

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...417...97h&link_type=abstract

Astrophysical Journal v.417, p.97

Astronomy and Astrophysics

Astronomy

3

Line: Formation, Line: Profiles, Galaxies: Quasars: General, Radiative Transfer, Relativity

Scientific paper

In the framework of the relativistic Sobolev theory for the transfer of line radiation in spherically symmetric expanding atmospheres, we investigate the effect on P Cygni line profiles of the frequency shape of the underlying continuum (a power law), as well as the influence of an eventual limb darkening of the core.
We find that the effects due to limb darkening are small as in the classical limit. On the contrary, the line profiles strongly depend on the power-law index characterizing the continuum shape, even for moderate values of the terminal velocity of the flow. While the absorption part of the line profiles remains essentially unchanged, the emission part may be significantly displaced, enhanced, or lowered up to nearly complete disappearance. The equivalent width of the line profiles clearly depends on the power-law index.
The relevance of these results for interpreting the spectrum of broad absorption line (BAL) QSOs is briefly discussed. Considering values currently estimated for both the terminal velocity of the flow and the power-law index of the continuum, we find that the equivalent width of the emission-line profiles should be significantly smaller than the equivalent width of the absorption profiles, therefore possibly providing us with a natural explanation for the low emission/absorption-line ratios reported in the spectrum of some BAL QSOs.

Affiliated with

Also associated with

No associations

Rating

Formation of P Cygni Line Profiles in Relativistically Expanding Atmospheres. II. The Effect of the Continuum Frequency Shape and Limb Darkening of the Core does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Formation of P Cygni Line Profiles in Relativistically Expanding Atmospheres. II. The Effect of the Continuum Frequency Shape and Limb Darkening of the Core, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Formation of P Cygni Line Profiles in Relativistically Expanding Atmospheres. II. The Effect of the Continuum Frequency Shape and Limb Darkening of the Core will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-808123