Two strong radio bursts at high and medium Galactic latitude

S. Kida, K. Niinuma, S. Suzuki, T. Tanaka, R. Nakanura, K. Takefuji, N. Matsumura, M. Kuniyoshi, T. Daishido

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The Nasu Observatory, which is composed of eight 20 m elements, was constructed for observing radio transients over a wide field at 1400 MHz. We report on two radio transients detected in consecutive drift scanning observations at declination 32° over a period of about two months. One of the two transients, WJN J1039+3200, appeared at α = 10h 39m 40s ± 10s, δ = 32 ° ± 0.4 ° on March 4, 2005, and the other one, WJN J0645+3200, appeared at α = 06h 45m 25s ± 10s, δ = 32 ° ± 0.4 ° on March 24, 2005. Both exhibited flux densities in excess of 1 Jy, and the burst durations were up to two days. Since there are few examples of radio transients outside the Galactic plane, these are very important observations. We have previously reported on four radio transients with features that look like the two transients detected this time. Of these six WJN transients in total, five had a duration of up to two days, and one up to three days. Four of the transients were detected at high Galactic latitude of b > 30°. Counterparts of the six WJN transients included X-ray sources in four events and had a consistency of 66%. The consistency of γ-ray, PGC Galaxy, NVSS, and FIRST sources was concentrated at about 50%. We were not able to find any special features in the counterparts. The distribution was verified by making a log N-log S plot using data for the four previously detected transients and the new ones. As a result, the distribution of the radio transients that we observed might have an isotropic distribution not dependent on Galactic longitude and Galactic latitude. The detection probability was calculated based on the assumption of an isotropic distribution. The 2σ upper probability limit for detection of transients of 1000 mJy or more is 0.0049 [deg-2 yr-1]. We cannot yet identify these two radio transients, because their features are different from any radio bursts observed in the past.

Original languageEnglish
Pages (from-to)519-525
Number of pages7
JournalNew Astronomy
Volume13
Issue number7
DOIs
Publication statusPublished - 2008 Oct
Externally publishedYes

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radio bursts
radio
declination
longitude
bursts
rays
observatories
flux density
plots
galaxies
scanning
observatory
x rays
Galaxies
distribution
Observatories

Keywords

  • Radio continuum: general
  • Stars: variables: other
  • Techniques: interferometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

Kida, S., Niinuma, K., Suzuki, S., Tanaka, T., Nakanura, R., Takefuji, K., ... Daishido, T. (2008). Two strong radio bursts at high and medium Galactic latitude. New Astronomy, 13(7), 519-525. https://doi.org/10.1016/j.newast.2008.01.009

Two strong radio bursts at high and medium Galactic latitude. / Kida, S.; Niinuma, K.; Suzuki, S.; Tanaka, T.; Nakanura, R.; Takefuji, K.; Matsumura, N.; Kuniyoshi, M.; Daishido, T.

In: New Astronomy, Vol. 13, No. 7, 10.2008, p. 519-525.

Research output: Contribution to journalArticle

Kida, S, Niinuma, K, Suzuki, S, Tanaka, T, Nakanura, R, Takefuji, K, Matsumura, N, Kuniyoshi, M & Daishido, T 2008, 'Two strong radio bursts at high and medium Galactic latitude', New Astronomy, vol. 13, no. 7, pp. 519-525. https://doi.org/10.1016/j.newast.2008.01.009
Kida S, Niinuma K, Suzuki S, Tanaka T, Nakanura R, Takefuji K et al. Two strong radio bursts at high and medium Galactic latitude. New Astronomy. 2008 Oct;13(7):519-525. https://doi.org/10.1016/j.newast.2008.01.009
Kida, S. ; Niinuma, K. ; Suzuki, S. ; Tanaka, T. ; Nakanura, R. ; Takefuji, K. ; Matsumura, N. ; Kuniyoshi, M. ; Daishido, T. / Two strong radio bursts at high and medium Galactic latitude. In: New Astronomy. 2008 ; Vol. 13, No. 7. pp. 519-525.
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AU - Takefuji, K.

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AU - Kuniyoshi, M.

AU - Daishido, T.

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AB - The Nasu Observatory, which is composed of eight 20 m elements, was constructed for observing radio transients over a wide field at 1400 MHz. We report on two radio transients detected in consecutive drift scanning observations at declination 32° over a period of about two months. One of the two transients, WJN J1039+3200, appeared at α = 10h 39m 40s ± 10s, δ = 32 ° ± 0.4 ° on March 4, 2005, and the other one, WJN J0645+3200, appeared at α = 06h 45m 25s ± 10s, δ = 32 ° ± 0.4 ° on March 24, 2005. Both exhibited flux densities in excess of 1 Jy, and the burst durations were up to two days. Since there are few examples of radio transients outside the Galactic plane, these are very important observations. We have previously reported on four radio transients with features that look like the two transients detected this time. Of these six WJN transients in total, five had a duration of up to two days, and one up to three days. Four of the transients were detected at high Galactic latitude of b > 30°. Counterparts of the six WJN transients included X-ray sources in four events and had a consistency of 66%. The consistency of γ-ray, PGC Galaxy, NVSS, and FIRST sources was concentrated at about 50%. We were not able to find any special features in the counterparts. The distribution was verified by making a log N-log S plot using data for the four previously detected transients and the new ones. As a result, the distribution of the radio transients that we observed might have an isotropic distribution not dependent on Galactic longitude and Galactic latitude. The detection probability was calculated based on the assumption of an isotropic distribution. The 2σ upper probability limit for detection of transients of 1000 mJy or more is 0.0049 [deg-2 yr-1]. We cannot yet identify these two radio transients, because their features are different from any radio bursts observed in the past.

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