The Spectrum of a BL Lacertae Object Shows

question 117

Multiple Choice

The spectrum of a BL Lacertae object shows

• A) strong, highly redshifted emission lines.
• B) doubled emission lines split by the Doppler shift from oppositely directed jets of material.
• C) absorption lines of highly ionized atoms.
• D) A fairly smooth continuum with exceptionally weak spectral lines.

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