DISCOVERY OF TWO RADIO TRANSIENTS AT A HIGH GALACTIC LATITUDE IN A 1.4 GHz DRIFT-SCAN SURVEY

Journal Article · Sat Oct 10 00:00:00 EDT 2009 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/704/1/652· OSTI ID:21367415

Niinuma, K ^[1]; Daishido, T; Matsumura, N; Takefuji, K; Kuniyoshi, M; Asuma, K ^[2]; Kida, S; Tanaka, T; Aoki, T; Ishikawa, S; Hirano, K; Uehara, H; Nakagawa, S ^[3]

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1. National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan)
2. Institute for Astrophysics, Project Research Institutes Comprehensive Research Organization, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555 (Japan)
3. Astrophysics, Department of Pure and Applied Physics, Graduate School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555 (Japan)

We report two new radio transients at high Galactic latitude, WJN J0951+3300 (alpha = 09{sup h}51{sup m}22{sup s} +- 10{sup s}, delta = 33{sup 0}00' +- 0{sup 0}.4, b = 50{sup 0}54.'2) and WJN J1039+3300 (alpha = 10{sup h}39{sup m}26{sup s} +- 10{sup s}, delta = 33{sup 0}00' +- 0{sup 0}.4, b = 60{sup 0}58.'5), 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.

• OSTI ID: 21367415
• Journal Information: Astrophysical Journal, Vol. 704, Issue 1; Other Information: DOI: 10.1088/0004-637X/704/1/652; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
FLUX DENSITY
GHZ RANGE 01-100
PULSARS
QUASARS
STARS
TRANSIENTS
COSMIC RADIO SOURCES
FREQUENCY RANGE
GHZ RANGE