Abstract
We report the selection of blazar candidates behind the Large and Small Magellanic Clouds. Both flat spectrum radio quasar and BL Lacreate objects were selected based on the long-term, multi-colour Optical Gravitational Lensing Experiment photometric data. We cross-correlated the Magellanic Quasar Survey catalogue of spectroscopically confirmed quasars and quasar candidates located behind the Magellanic Clouds with the radio data at six frequencies from 0.8 to 20 GHz. Among the 1654 objects visible in optical range, we identified a sample of 44 newly selected blazar candidates, including 27 flat spectrum radio quasars and 17 BL Lacs. We examined selected objects with respect to their radio, optical, and mid-infrared properties.
Highlights
The Optical Gravitational Lensing Experiment (OGLE) has observed a few million stars in the area of both Magellanic Clouds (MCs)
The active galactic nuclei (AGN) candidates found in the MC fields were analysed in a four-step selection process: mid-infrared properties, optical variability, ROSAT X-ray counterparts, and, optical spectroscopy study
During the selection process of the Magellanic Quasars Survey (MQS) quasars, some of the AGN candidates were rejected in the spectroscopic analysis due to the lack of particular emission lines in their optical spectra and were listed in the separate list of featureless sources (FS), still obeying any of the mid-infrared and optical variability criteria
Summary
The Optical Gravitational Lensing Experiment (OGLE) has observed a few million stars in the area of both Magellanic Clouds (MCs). The Magellanic Quasars Survey (MQS) [1] is based on an OGLE-III phase of the experiment and was designed to increase the number of the identified active galactic nuclei (AGN) behind both MCs. This survey covers 100% of the LMC and 70% of the SMC
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