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

Journal
Date Issued
2017
Author(s)
•
•
•
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Scarpa, Riccardo
DOI
Abstract
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).
Volume
844
Issue
2
Start page
120
Uri
Url
Issn Identifier
0004-637X
Ads BibCode
2017ApJ...844..120P
Rights
open.access
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