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FRB 150418: clues to its nature from European VLBI Network and e-MERLIN observations

M. Ciroletti ; B. Marcote ; M.A. Garrett ; Z. Paragi ; Jun Yang (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; K. Hada ; T .W. B. Muxlow ; C.C. Cheung
Astronomy and Astrophysics (0004-6361). Vol. 593 (2016), p. L16-L19.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: galaxies: active / galaxies: individual: WISE J071634.59-190039.2 / radio continuum: galaxies / scattering



Denna post skapades 2016-11-02. Senast ändrad 2016-12-09.
CPL Pubid: 244627

 

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