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
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.
New Astronomy
https://doi.org/10.1016/j.newast.2008.01.009
Published - 2008 10月
天文学と天体物理学
10.1016/j.newast.2008.01.009
「Two strong radio bursts at high and medium Galactic latitude」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。
radio bursts Physics & Astronomy 100%
radio Earth & Environmental Sciences 65%
declination Physics & Astronomy 25%
longitude Physics & Astronomy 22%
observatories Physics & Astronomy 16%
bursts Physics & Astronomy 16%
rays Physics & Astronomy 16%
distribution Earth & Environmental Sciences 15%
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, 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. その他.
In: New Astronomy, Vol. 13, No. 7, 10.2008, p. 519-525.
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 その他. Two strong radio bursts at high and medium Galactic latitude. New Astronomy. 2008 10月;13(7):519-525. doi: 10.1016/j.newast.2008.01.009
Kida, S. ; Niinuma, K. ; Suzuki, S. その他. / Two strong radio bursts at high and medium Galactic latitude. In: New Astronomy. 2008 ; Vol. 13, No. 7. pp. 519-525.
@article{b4456dd10c024c78beb1bee11b56fdf8,
title = "Two strong radio bursts at high and medium Galactic latitude",
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.",
keywords = "Radio continuum: general, Stars: variables: other, Techniques: interferometric",
author = "S. Kida and K. Niinuma and S. Suzuki and T. Tanaka and R. Nakanura and K. Takefuji and N. Matsumura and M. Kuniyoshi and T. Daishido",
doi = "10.1016/j.newast.2008.01.009",
journal = "New Astronomy",
T1 - Two strong radio bursts at high and medium Galactic latitude
AU - Kida, S.
AU - Niinuma, K.
AU - Suzuki, S.
AU - Tanaka, T.
AU - Nakanura, R.
AU - Takefuji, K.
AU - Matsumura, N.
AU - Kuniyoshi, M.
AU - Daishido, T.
N2 - 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.
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.
KW - Radio continuum: general
KW - Stars: variables: other
KW - Techniques: interferometric
U2 - 10.1016/j.newast.2008.01.009
DO - 10.1016/j.newast.2008.01.009
JO - New Astronomy
JF - New Astronomy