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Journal Article

Hunting distant BL Lacertae objects with the photometric technique using Swift and SARA

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Rau,  A.
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Rajagopal, M., Kaur, A., Ajello, M., Rau, A., Domínguez, A., Cenko, B., et al. (2020). Hunting distant BL Lacertae objects with the photometric technique using Swift and SARA. The Astrophysical Journal, 898(1): 18. doi:10.3847/1538-4357/ab96c4.


Cite as: https://hdl.handle.net/21.11116/0000-0007-3115-A
Abstract
BL Lacertae objects represent a large fraction (22%) of γ-ray sources in the Third Fermi Large Area Telescope catalog (3FGL). Nearly half of the BL Lac object population remains without a redshift because of their featureless optical spectra. We aim to increase the number of BL Lac objects with a redshift measurement by using the photometric technique. For this work, we have used six Swift-UVOT filters and SDSS g', r', i', and z' optical filters mounted on the 0.65 m SARA–CTIO located in Chile and the 1.0 m SARA–ORM in the Canary Islands. A sample of 45 sources was selected from the 3FGL catalog for which photometry was performed in 10 optical and UV filters to obtain redshift measurements. We found three sources with z > 1.3, while reliable upper limits have been provided for 17 sources. The results presented here bring the total number of high-z (z > 1.3) BL Lac objects to 29.