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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 660844.0, MPI für Astronomie / Publikationen_mpia
On the redshift of the bright BL Lacertae object PKS 0048-097
Authors:Landoni, M.; Falomo, R.; Treves, A.; Sbarufatti, B.; Decarli, R.; Tavecchio, F.; Kotilainen, J.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:Astronomy and Astrophysics
Volume:543
Start Page:id.A116
Audience:Not Specified
Abstract / Description:<BR /> Aims: We attempt to determine the spectroscopic redshifts of bright BL Lac objects, which have proven difficult to measure. <BR /> Methods: We use the spectra acquired using the newly available spectrograph X-Shooter at the European Southern Observatory Very Large Telescope, which combines high resolution with a large wavelength range, to obtain ultraviolet to near-infrared spectra of BL Lacs. <BR /> Results: Our observations of <ASTROBJ>PKS 0048-097</ASTROBJ> detect three emission lines, which permit us to derive a redshift z = 0.635. Moreover, we discover a Mg II absorption system at z = 0.154 that is associated with a foreground spiral galaxy a 50 kpc of projected distance. <BR /> Conclusions: The measured redshift allows us to discuss the optical beaming factor and the absorption of the high energy spectrum by the extragalactic background light.
Free Keywords:BL Lacertae objects: individual: PKS 0048-097; galaxies: active
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2012A%26A...543A.11...
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