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FRB 150418: clues t...
FRB 150418: clues to its nature from European VLBI Network and e-MERLIN observations
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- Ciroletti, M. (författare)
- Istituto di Radioastronomia
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- Marcote, B. (författare)
- Joint Institute for VLBI in Europe (JIVE)
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- Garrett, M.A. (författare)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Paragi, Z. (författare)
- Joint Institute for VLBI in Europe (JIVE)
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- Yang, Jun, 1979 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Hada, K. (författare)
- National Astronomical Observatory of Japan
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- Muxlow, T .W. B. (författare)
- University of Manchester
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- Cheung, C.C. (författare)
- Naval Research Laboratory
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(creator_code:org_t)
- 2016-09-23
- 2016
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 593, s. L16-L19
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Abstract
Ämnesord
Stäng
- Aims: We investigate the nature of the compact and possibly variable nuclear radio source in the centre of WISE J0716-19, the proposed host galaxy of the fast radio burst FRB 150418. Methods: We observed WISE J0716-19 at 5.0 GHz with the European VLBI Network (EVN) four times between 2016 March 16 and June 2. At three epochs, we simultaneously observed the source with e-MERLIN at the same frequency. Results: We detected a compact source in the EVN data in each epoch with a significance of up to ~8σ. The four epochs yielded consistent results within their uncertainties for the peak surface intensity and positions. The mean values for these quantities are Ipeak = (115 ± 9)μJy beam-1 and RA = 07h16m34.55496(7)s, Dec = -19°00'39.4754(8)''. The e-MERLIN data provided ~3-5σ detections at a position consistent with those of the EVN data. The emission on angular scales intermediate between the EVN and e-MERLIN is consistent with being null. The brightness temperature of the EVN core is Tb ≳ 108.5 K, close to the value previously required to explain the short-term radio variability properties of WISE J0716-19 in terms of interstellar scintillation. Conclusions: Our observations provide direct and independent evidence of a nuclear compact source in WISE J0716-19, a physical scenario without evident connection with FRB 150418. However, the EVN data do not indicate the variability observed with the VLA.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- galaxies: active / galaxies: individual: WISE J071634.59-190039.2 / radio continuum: galaxies / scattering
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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