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- W2895285854 abstract "BL Lac objects are known to have compact jets inclined to our line of sight at a small angle, showing prominent radio emission. Two radio-weak BL Lac candidates with no counterparts in current radio surveys were recently reported by Massaro et al. (2017). Both sources were selected as candidate low-energy counterparts of unassociated Fermi {gamma}-ray sources. We carried out very long baseline interferometry (VLBI) observations with the European VLBI Network (EVN) at 5 GHz to explore their radio properties at milli-arcsecond (mas) scale. One target, J1410+7405, is clearly detected with the EVN. Its measured 5-GHz flux density, 2.4 mJy, is consistent with recent interferometric measurements with the Karl G. Jansky Very Large Array, suggesting that the radio emission is confined to the inner < ~10 mas region. J1410+7405 is therefore identified as a radio-loud jetted active galactic nucleus, and its brightness temperature exceeds ~10^9 K. Its properties are similar to those of other {gamma}-ray detected BL Lac objects. On the other hand, the second target, J0644+6031, remains undetected with the EVN with a 6-{sigma} brightness upper limit of 0.12 mJy/beam. This source is thus radio-quiet, confirming its peculiarity, or possibly questioning its BL Lac nature." @default.
- W2895285854 created "2018-10-12" @default.
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- W2895285854 date "2018-10-04" @default.
- W2895285854 modified "2023-10-09" @default.
- W2895285854 title "The loud and the quiet: searching for radio counterparts of two radio-weak BL Lac candidates with VLBI" @default.
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- W2895285854 doi "https://doi.org/10.1093/mnrasl/sly184" @default.
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