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Is FRB 150418 Localized in WISE J0716−19? Clues from EVN Observations

B. Marcote, M. Giroletti, M. A. Garrett, Z. Paragi, J. Yang, K. Hada, T. W. B. Muxlow, C. C. Cheung

Труды ИПА РАН, вып. 41, 18–22 (2017)

Ключевые слова: galaxies: active, VLBI

Аннотация

FRB 150418 is the first fast radio bursts claimed to be localized. Keane et al. (2016) reported its association with a radio transient source hosted by an elliptical galaxy, WISE J0716−1900, located at a distance of z = 0.492 ± 0.008. However, this association has been questioned with recent VLA observations, which would support that the transient source is actually an active galactic nucleus (AGN) and thus unlinked with the origin of FRB 150418. Here we present the observations conducted with the European VLBI Network (EVN) at 5.0 GHz at four different epochs, together with three simultaneous e-MERLIN observations, to clarify the origin of the transient source located in WISE J0716−1900. We report a compact radio source on milliarcsecond scales with a persistent flux density of 115 ± 9 µJy beam¯¹, which implies a luminosity of (1.13 ± 0.15) × 10²³ W Hz¯¹ given the distance of the galaxy. Additionally, the compactness of the source allows us to estimate a brightness temperature of Tb ≥ 10⁸·⁵ K. These results are consistent with a scintillating low-luminosity AGN located in the center of WISE J0716 − 1900.

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B. Marcote, M. Giroletti, M. A. Garrett, Z. Paragi, J. Yang, K. Hada, T. W. B. Muxlow, C. C. Cheung. Is FRB 150418 Localized in WISE J0716−19? Clues from EVN Observations // Труды ИПА РАН. — 2017. — Вып. 41. — С. 18–22.

@article{marcote2017,
  abstract = {FRB 150418 is the first fast radio bursts claimed to be localized. Keane et al. (2016) reported its association with a radio transient source hosted by an elliptical galaxy,  WISE J0716−1900,  located at a distance of z = 0.492 ± 0.008. However, this association has been questioned with recent VLA observations, which would support that the transient source is actually an active galactic nucleus (AGN) and thus unlinked with the origin of FRB 150418. Here we present the observations conducted with the European VLBI Network (EVN) at 5.0 GHz at four different epochs, together with three simultaneous e-MERLIN observations, to clarify the origin of the transient source located in WISE J0716−1900. We report a compact radio source on milliarcsecond scales with a persistent flux density of 115 ± 9 µJy beam¯¹, which implies  a  luminosity  of (1.13 ± 0.15) × 10²³ W Hz¯¹ given the distance of the galaxy. Additionally, the compactness of the source allows us to estimate a brightness temperature of Tb ≥ 10⁸·⁵ K. These results are consistent with a scintillating low-luminosity AGN located in the center of WISE J0716 − 1900.},
  author = {B. Marcote and M. Giroletti and M.~A. Garrett and Z. Paragi and J. Yang and K. Hada and T.~W.~B. Muxlow and C.~C. Cheung},
  issue = {41},
  journal = {Труды ИПА РАН},
  keyword = {galaxies: active, VLBI},
  pages = {18--22},
  title = {Is FRB 150418 Localized in WISE J0716−19? Clues from EVN Observations},
  url = {http://iaaras.ru/library/paper/1696/},
  year = {2017}
}

TY  - JOUR
TI  - Is FRB 150418 Localized in WISE J0716−19? Clues from EVN Observations
AU  - Marcote, B.
AU  - Giroletti, M.
AU  - Garrett, M. A.
AU  - Paragi, Z.
AU  - Yang, J.
AU  - Hada, K.
AU  - Muxlow, T. W. B.
AU  - Cheung, C. C.
PY  - 2017
T2  - Труды ИПА РАН
IS  - 41
SP  - 18
AB  - FRB 150418 is the first fast radio bursts claimed to be localized.
Keane et al. (2016) reported its association with a radio transient
source hosted by an elliptical galaxy,  WISE J0716−1900,  located at
a distance of z = 0.492 ± 0.008. However, this association has been
questioned with recent VLA observations, which would support that the
transient source is actually an active galactic nucleus (AGN) and
thus unlinked with the origin of FRB 150418. Here we present the
observations conducted with the European VLBI Network (EVN) at 5.0
GHz at four different epochs, together with three simultaneous
e-MERLIN observations, to clarify the origin of the transient source
located in WISE J0716−1900. We report a compact radio source on
milliarcsecond scales with a persistent flux density of 115 ± 9 µJy
beam¯¹, which implies  a  luminosity  of (1.13 ± 0.15) × 10²³ W Hz¯¹
given the distance of the galaxy. Additionally, the compactness of
the source allows us to estimate a brightness temperature of Tb ≥
10⁸·⁵ K. These results are consistent with a scintillating low-
luminosity AGN located in the center of WISE J0716 − 1900.
UR  - http://iaaras.ru/library/paper/1696/
ER  -