On the distance of PG 1553+11 - A lineless BL Lacertae object active in the TeV band

@article{Treves2007OnTD,
  title={On the distance of PG 1553+11 - A lineless BL Lacertae object active in the TeV band},
  author={Aldo Treves and Renato Falomo and Michela Uslenghi Insubria University and Como and Italy. and -INAF and Observatory of Padova and INAF-IASF and Milano},
  journal={Astronomy and Astrophysics},
  year={2007},
  volume={473}
}
Context. The redshift of PG 1553+11, a bright BL Lac object (V ∼ 14), is still unknown. It has been recently observed in the TeV band, a fact that offers an upper limit for the redshift z < 0.4. Aims. We intend to provide a lower limit for the distance of the object. Methods. We used a χ 2 procedure to constrain the apparent magnitude of the host galaxy in archived HST images. Supposing that the host galaxy is typical of BL Lac objects (MR −22.8), a lower limit to the distance can be obtained… 

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