Discovery of two radio transients at a high galactic latitude in a 1.4 ghz drift-scan survey

K. Niinuma, T. Daishido, N. Matsumura, K. Takefuji, M. Kuniyoshi, K. Asuma, S. Kida, T. Tanaka, T. Aoki, S. Ishikawa, K. Hirano, H. Uehara, S. Nakagawa

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    Abstract

    We report two new radio transients at high Galactic latitude, WJN J0951+3300 (α = 09h51m22s 10s, δ = 33°00′ 0°.4, b = 50°542) and WJN J1039+3300 (α = 10h39m26s 10s, δ = 33°00′ 0°.4, b = 60°585), which were detected by interferometric drift-scan observations at 1.4 GHz at the Waseda Nasu Pulsar Observatory. WJN J0951+3300 was detected at 16:49:32 UT on 2006 January 12 with the flux density of approximately 1760.5 265.9 mJy, and WJN J1039+3300 was detected at 17:13:32 UT on 2006 January 18 with the flux density of approximately 2242.5 228.7 mJy. Both of them lasted for a short duration (≤2 days). The possibility that the distribution of the WJN radio transients is isotropic was suggested in a previous study. Having re-evaluated the log N-log S relation with the addition of the two new objects reported in this paper, we find that the slope is consistent with a slope of -1.5 and the previous result. Additionally, although there are several counterparts to WJN radio transients, we found that one of the quasar counterparts within the positional error of WJN J0951+3300 could be a radio-loud quasar. We have discussed whether or not WJN J0951+3300 could be of this quasar origin.

    Original languageEnglish
    Pages (from-to)652-660
    Number of pages9
    JournalAstrophysical Journal
    Volume704
    Issue number1
    DOIs
    Publication statusPublished - 2009

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    quasars
    radio
    flux density
    slopes
    pulsars
    observatories
    observatory

    Keywords

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

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Niinuma, K., Daishido, T., Matsumura, N., Takefuji, K., Kuniyoshi, M., Asuma, K., ... Nakagawa, S. (2009). Discovery of two radio transients at a high galactic latitude in a 1.4 ghz drift-scan survey. Astrophysical Journal, 704(1), 652-660. https://doi.org/10.1088/0004-637X/704/1/652

    Discovery of two radio transients at a high galactic latitude in a 1.4 ghz drift-scan survey. / Niinuma, K.; Daishido, T.; Matsumura, N.; Takefuji, K.; Kuniyoshi, M.; Asuma, K.; Kida, S.; Tanaka, T.; Aoki, T.; Ishikawa, S.; Hirano, K.; Uehara, H.; Nakagawa, S.

    In: Astrophysical Journal, Vol. 704, No. 1, 2009, p. 652-660.

    Research output: Contribution to journalArticle

    Niinuma, K, Daishido, T, Matsumura, N, Takefuji, K, Kuniyoshi, M, Asuma, K, Kida, S, Tanaka, T, Aoki, T, Ishikawa, S, Hirano, K, Uehara, H & Nakagawa, S 2009, 'Discovery of two radio transients at a high galactic latitude in a 1.4 ghz drift-scan survey', Astrophysical Journal, vol. 704, no. 1, pp. 652-660. https://doi.org/10.1088/0004-637X/704/1/652
    Niinuma, K. ; Daishido, T. ; Matsumura, N. ; Takefuji, K. ; Kuniyoshi, M. ; Asuma, K. ; Kida, S. ; Tanaka, T. ; Aoki, T. ; Ishikawa, S. ; Hirano, K. ; Uehara, H. ; Nakagawa, S. / Discovery of two radio transients at a high galactic latitude in a 1.4 ghz drift-scan survey. In: Astrophysical Journal. 2009 ; Vol. 704, No. 1. pp. 652-660.
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    abstract = "We report two new radio transients at high Galactic latitude, WJN J0951+3300 (α = 09h51m22s 10s, δ = 33°00′ 0°.4, b = 50°542) and WJN J1039+3300 (α = 10h39m26s 10s, δ = 33°00′ 0°.4, b = 60°585), which were detected by interferometric drift-scan observations at 1.4 GHz at the Waseda Nasu Pulsar Observatory. WJN J0951+3300 was detected at 16:49:32 UT on 2006 January 12 with the flux density of approximately 1760.5 265.9 mJy, and WJN J1039+3300 was detected at 17:13:32 UT on 2006 January 18 with the flux density of approximately 2242.5 228.7 mJy. Both of them lasted for a short duration (≤2 days). The possibility that the distribution of the WJN radio transients is isotropic was suggested in a previous study. Having re-evaluated the log N-log S relation with the addition of the two new objects reported in this paper, we find that the slope is consistent with a slope of -1.5 and the previous result. Additionally, although there are several counterparts to WJN radio transients, we found that one of the quasar counterparts within the positional error of WJN J0951+3300 could be a radio-loud quasar. We have discussed whether or not WJN J0951+3300 could be of this quasar origin.",
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    AU - Niinuma, K.

    AU - Daishido, T.

    AU - Matsumura, N.

    AU - Takefuji, K.

    AU - Kuniyoshi, M.

    AU - Asuma, K.

    AU - Kida, S.

    AU - Tanaka, T.

    AU - Aoki, T.

    AU - Ishikawa, S.

    AU - Hirano, K.

    AU - Uehara, H.

    AU - Nakagawa, S.

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    AB - We report two new radio transients at high Galactic latitude, WJN J0951+3300 (α = 09h51m22s 10s, δ = 33°00′ 0°.4, b = 50°542) and WJN J1039+3300 (α = 10h39m26s 10s, δ = 33°00′ 0°.4, b = 60°585), which were detected by interferometric drift-scan observations at 1.4 GHz at the Waseda Nasu Pulsar Observatory. WJN J0951+3300 was detected at 16:49:32 UT on 2006 January 12 with the flux density of approximately 1760.5 265.9 mJy, and WJN J1039+3300 was detected at 17:13:32 UT on 2006 January 18 with the flux density of approximately 2242.5 228.7 mJy. Both of them lasted for a short duration (≤2 days). The possibility that the distribution of the WJN radio transients is isotropic was suggested in a previous study. Having re-evaluated the log N-log S relation with the addition of the two new objects reported in this paper, we find that the slope is consistent with a slope of -1.5 and the previous result. Additionally, although there are several counterparts to WJN radio transients, we found that one of the quasar counterparts within the positional error of WJN J0951+3300 could be a radio-loud quasar. We have discussed whether or not WJN J0951+3300 could be of this quasar origin.

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    KW - Stars: variables: other

    KW - Techniques: interferometric

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