BL Lac objects (BLLs) are defined by the presence of very weak (typically 0. 6) BLLs, many of which are commonly cited in the literature despite appearing questionable. We present new spectra for 52 objects obtained with the 10. 4 m GTC. For 16 of them we propose a new redshift or provide a spectroscopic lower limit, while for 14 sources we confirm previously published values. In 22 cases the spectra remain featureless, even with high S/N observations. These objects are likely to lie at 0. 3 0. 6 that meet our selection criteria.
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R. Falomo
A. Treves
S. Paiano
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Falomo et al. (Thu,) studied this question.
www.synapsesocial.com/papers/69df2abce4eeef8a2a6afc06 — DOI: https://doi.org/10.1051/0004-6361/202558277/pdf