Bibcode
Paiano, S.; Landoni, Marco; Falomo, Renato; Treves, Aldo; Scarpa, R.
Bibliographical reference
The Astrophysical Journal, Volume 844, Issue 2, article id. 120, 7 pp. (2017).
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8
2017
Journal
Citations
32
Refereed citations
30
Description
We present optical spectra with high signal-to-noise ratio of 10 BL Lac
objects detected at GeV energies by the Fermi satellite (3FGL catalog),
which previous observations suggested are at relatively high redshift.
The new observations, obtained at the 10 m Gran Telescopio Canarias,
allowed us to find the redshift for J0814.5+2943 (z = 0.703), and we can
set a spectroscopic lower limit for J0008.0+4713 (z > 1.659) and
J1107.7+0222 (z > 1.0735) on the basis of Mg ii intervening
absorption features. In addition we confirm the redshifts for
J0505.5+0416 (z = 0.423) and J1450+5200 (z > 2.470). Finally we
contradict the previous z estimates for five objects (J0049.7+0237,
J0243.5+7119, J0802.0+1005, J1109.4+2411, and J2116.1+3339).
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