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Issue A&A
Volume 487, Number 2, August IV 2008
Page(s) L29 - L32
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200810310
Published online 01 July 2008



A&A 487, L29-L32 (2008)
DOI: 10.1051/0004-6361:200810310

Letter

Detection of the host galaxy of S5 0716+714

K. Nilsson1, T. Pursimo2, A. Sillanpää1, L. O. Takalo1, and E. Lindfors1, 3

1  Tuorla Observatory, University of Turku, Väisäläntie 20, 21500 Piikkiö, Finland
    e-mail: kani@utu.fi
2  Nordic Optical Telescope, Apartado 474, 38700 Santa Cruz de La Palma, Santa Cruz de Tenerife, Spain
3  Metsähovi Radio Observatory, TKK, Helsinki University of Technology, Metsähovintie 114, 02540 Kylmälä, Finland

Received 2 June 2008 / Accepted 20 June 2008

Abstract
We have acquired a deep i-band image of the BL Lacertae object S5 0716+714 while the target was in an low optical state. Due to the faintness of the nucleus, we were able to detect the underlying host galaxy. The host galaxy is measured to have an I-band magnitude of $17.5 \pm 0.5$ and an effective radius of ( $2.7 \pm 0.8$) arcsec. Using the host galaxy as a "standard candle", we derive $z = 0.31 \pm 0.08$ (1$\sigma$ error) for the host galaxy of S5 0716+714 . This redshift is consistent with the redshift z = 0.26 determined by spectroscopy for 3 galaxies close to S5 0716+714 . The effective radius at z = 0.31 would be $12 \pm 4$ kpc, which is consistent with values obtained for BL Lac host galaxies. An optical spectrum acquired during the same epoch shows no identifiable spectral lines.


Key words: galaxies: active -- galaxies: distances and redshifts -- BL Lacertae objects: individual: S5 0716+714



© ESO 2008


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