Spectroscopy of 10 γ-Ray BL Lac Objects at High Redshift

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 fi...

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Bibliographic Details
Published in:The Astrophysical journal 2017-08, Vol.844 (2), p.120
Main Authors: Paiano, Simona, Landoni, Marco, Falomo, Renato, Treves, Aldo, Scarpa, Riccardo
Format: Article
Language:English
Subjects:
ABSORPTION
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BL LACERTAE OBJECTS
BL Lacertae objects: general
COSMIC GAMMA SOURCES
GALAXIES
galaxies: distances and redshifts
GAMMA RADIATION
GEV RANGE
NOISE
Object recognition
Optical communication
RED SHIFT
Satellite observation
SATELLITES
SIGNAL-TO-NOISE RATIO
SPECTRA
SPECTROSCOPY
Spectrum analysis
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Summary: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).
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/aa7aac