On the redshift of the bright BL Lacertae object PKS 0048-097

M. Landoni, R. Falomo, A. Treves, B. Sbarufatti, R. Decarli, F. Tavecchio, J. Kotilainen

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Aims. We attempt to determine the spectroscopic redshifts of bright BL Lac objects, which have proven difficult to measure. 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. Results. Our observations of PKS 0048-097 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. 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.

Original languageEnglish (US)
Article numberA116
JournalAstronomy and Astrophysics
Volume543
DOIs
StatePublished - Jul 13 2012

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BL Lacertae objects
spiral galaxies
European Southern Observatory
spectrographs
energy spectra
infrared spectra
telescopes
high resolution
near infrared
observatory
wavelengths
wavelength
energy

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Landoni, M., Falomo, R., Treves, A., Sbarufatti, B., Decarli, R., Tavecchio, F., & Kotilainen, J. (2012). On the redshift of the bright BL Lacertae object PKS 0048-097. Astronomy and Astrophysics, 543, [A116]. https://doi.org/10.1051/0004-6361/201219114
Landoni, M. ; Falomo, R. ; Treves, A. ; Sbarufatti, B. ; Decarli, R. ; Tavecchio, F. ; Kotilainen, J. / On the redshift of the bright BL Lacertae object PKS 0048-097. In: Astronomy and Astrophysics. 2012 ; Vol. 543.
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Landoni, M, Falomo, R, Treves, A, Sbarufatti, B, Decarli, R, Tavecchio, F & Kotilainen, J 2012, 'On the redshift of the bright BL Lacertae object PKS 0048-097', Astronomy and Astrophysics, vol. 543, A116. https://doi.org/10.1051/0004-6361/201219114

On the redshift of the bright BL Lacertae object PKS 0048-097. / Landoni, M.; Falomo, R.; Treves, A.; Sbarufatti, B.; Decarli, R.; Tavecchio, F.; Kotilainen, J.

In: Astronomy and Astrophysics, Vol. 543, A116, 13.07.2012.

Research output: Contribution to journalArticle

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AU - Landoni, M.

AU - Falomo, R.

AU - Treves, A.

AU - Sbarufatti, B.

AU - Decarli, R.

AU - Tavecchio, F.

AU - Kotilainen, J.

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AB - Aims. We attempt to determine the spectroscopic redshifts of bright BL Lac objects, which have proven difficult to measure. 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. Results. Our observations of PKS 0048-097 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. 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.

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