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The loud and the qu...
The loud and the quiet: Searching for radio counterparts of two radio-weak BL Lac candidates with VLBI
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- Cao, Hong Min (författare)
- Shangqiu Normal University,Chinese Academy of Sciences
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- Frey, Sándor (författare)
- Magyar Tudomanyos Akademia,Hungarian Academy of Sciences
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- Gabányi, Krisztina E. (författare)
- Magyar Tudomanyos Akademia,Hungarian Academy of Sciences
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- Yang, Jun, 1979 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Cui, Lang (författare)
- Chinese Academy of Sciences
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- Hong, X. Y. (författare)
- Shanghai Astronomical Observatory. Chinese Academy of Sciences,Shanghai Astronomical Observatory Chinese Academy of Sciences
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- An, Tao (författare)
- Shanghai Astronomical Observatory. Chinese Academy of Sciences,Shanghai Astronomical Observatory Chinese Academy of Sciences
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(creator_code:org_t)
- 2018-10-04
- 2019
- Engelska.
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Ingår i: Monthly Notices of the Royal Astronomical Society: Letters. - : Oxford University Press (OUP). - 1745-3925 .- 1745-3933. ; 482:1, s. L34-L39
- Relaterad länk:
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https://edit.elte.hu...
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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. Both sources were selected as candidate low-energy counterparts of unassociated Fermi γ -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 the milliarcsecond (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 interferometricmeasurementswith theKarlG. JanskyVery LargeArray, 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 ~109 K. Its properties are similar to those of other γ -ray-detected BL Lac objects. On the other hand, the second target, J0644+6031, remains undetected with the EVN with a 6s brightness upper limit of 0.12 mJy beam-1. This source is thus radio-quiet, confirming its peculiarity, or possibly questioning its BL Lac nature.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- Galaxies: individual: J1410+7405
- BL Lacertae objects: general
- Galaxies: individual: J0644+6031
- Galaxies: active
- Quasars: general
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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