High-redshift BL Lac Objects: Spectroscopy of Candidates
Journal
Date Issued
2018
Author(s)
Abstract
We report on 16 BL Lacertae objects that were proposed to be at z > 1. We present spectroscopic observations secured at the 10.4 m GTC that allowed us to assess the redshift of these sources. In particular, for five objects, we disprove the previous value of the redshift reported in the literature and found that they lie at z < 1. Moreover, two of them exhibit broad emission lines that are not characteristic of BL Lacertae objects. On the other hand, for eight targets, we improve the tentative value of z, previously based on only one feature, by detecting a number of emission lines. Finally, in three cases, we detect the onset of the Lyα forest at z > 2.50. Based on the new high quality spectra, we found that only half of the observed objects can be classified as bona-fide BL Lacs.
Volume
861
Issue
2
Start page
130
Issn Identifier
0004-637X
Ads BibCode
2018ApJ...861..130L
Rights
open.access
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