The Redshift of BL Lacertae Objects from High Signal-to-Noise VLT Spectra

Details The Redshift of BL Lacertae Objects from High Signal-to-Noise VLT Spectra The Redshift of BL Lacertae Objects from High Signal-to-Noise VLT Spectra

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007msngr.129...42f&link_type=abstract

The Messenger, vol. 129, p. 42-44

Physics

Scientific paper

BL Lacertae objects are active galactic nuclei dominated by non-thermal continuum emission and characterised by absence or extreme weakness of emission lines. These properties in several cases hinder the determination of their distance and thus the assessment of the properties of the class. High signal-to-noise optical spectra of these sources obtained with the VLT help to overcome these difficulties and allow one to obtain new redshifts and set stringent limits on the distance for pure lineless objects.

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