High and Low Galactic Latitude Radio Transients in the Nasu 1.4 GHz Wide-Field Survey

Matsumura, N.; Daishido, T.; Kuniyoshi, M.; Asuma, K.; Takefuji, Kazuhiro; Niinuma, Kotaro; Kida, S.; Takeuchi, Akihiko; Nakamura, Ryosuke; Shigehiro, S.; Tanaka, T.

doi:10.1086/511774

Cited by 23 publications

(24 citation statements)

References 18 publications

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“…Matsumura et al 2007Matsumura et al , 2009), due to poor statistics, limited localisation, and a long time before followup. However, there have been successes that, while enigmatic, hint at the potential offered by the MWA.…”

Section: New Opportunitiesmentioning

confidence: 99%

Science with the Murchison Widefield Array

Bowman

Cairns

Kaplan

et al. 2013

Publ. Astron. Soc. Aust.

318

181

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Significant new opportunities for astrophysics and cosmology have been identified at low radio frequencies. The Murchison Widefield Array is the first telescope in the southern hemisphere designed specifically to explore the low-frequency astronomical sky between 80 and 300 MHz with arcminute angular resolution and high survey efficiency. The telescope will enable new advances along four key science themes, including searching for redshifted 21-cm emission from the EoR in the early Universe; Galactic and extragalactic all-sky southern hemisphere surveys; time-domain astrophysics; and solar, heliospheric, and ionospheric science and space weather. The Murchison Widefield Array is located in Western Australia at the site of the planned Square Kilometre Array (SKA) low-band telescope and is the only low-frequency SKA precursor facility. In this paper, we review the performance properties of the Murchison Widefield Array and describe its primary scientific objectives.

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Section: New Opportunitiesmentioning

confidence: 99%

Science with the Murchison Widefield Array

Bowman

Cairns

Kaplan

et al. 2013

Publ. Astron. Soc. Aust.

318

181

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“…Along with Bower's discovery, 11 radio transients were detected in Nasu sky surveys conducted by the Nasu Observatory Niinuma et al 2007a;Matsumura et al 2007;Kida et al 2008;Matsumura et al 2009;Niinuma et al 2009). The flux density of the transients exceeded 1 Jy at 1.42 GHz, their duration time ranged from minutes to days, and no clear counterparts were observed (see Section 2 for details).…”

Section: Introductionmentioning

confidence: 93%

“…Thus, we reconfirmed the fringe spacings by autocorrelation. Each of the previous papers reported this double checking process Niinuma et al 2007a;Matsumura et al 2007;Kida et al 2008;Matsumura et al 2009;Niinuma et al 2009). However, previous studies did not adequately investigate the noise intensity and significance of the S/N.…”

Section: Previous Analysismentioning

confidence: 99%

Reliability of Radio Transients Detected in the Nasu Sky Survey

Aoki

Tanaka

Niinuma

et al. 2013

ApJ

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This article reports on the reliability of 11 radio transients detected in the Nasu sky survey. We derived false detection rates and evaluated the statistical significance of each transient source. A single source, labeled WJN J1443+3439, was statistically significant at the 10 −5 significance level; the other 10 sources were insignificant. On the basis of this single detection, the sky surface density of live radio transients was estimated to be 2 +9 −1.9 × 10 −6 deg −2 at a flux density above 3 Jy and a frequency of 1.42 GHz. Since this result is comparable with other survey results and known transients, WJN J1443+3439 could not be excluded. The sky surface density supported a power-law distribution of source count versus flux density. For transient events, the power-law exponent was approximately −3/2. These results are expected to assist radio variable/transient surveys in next-generation facilities such as the Square Kilometre Array.

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“…Amy, Large, & Vaughan 1989;Katz et al 2003;Matsumura et al 2007) over the last few decades. These surveys have been severely limited in their sensitivity, sky coverage, and cadence.…”

Section: Exploration Of the Unknownmentioning

confidence: 99%

“…One transient candidate was reported and a thorough discussion of the variable radio sources within the field was given. Matsumura et al (2009) summarise the detections of nine candidate transient sources from the Nasu 1.4-GHz widefield survey (see Kuniyoshi et al 2007;Matsumura et al 2007;Niinuma et al 2007Niinuma et al , 2009Kida et al 2008, for full details). The sources were detected in a drift scan mode and have flux densities greater than 1 Jy, with typical timescales of minutes to days.…”

Section: Gigahertz Surveysmentioning

confidence: 99%

VAST: An ASKAP Survey for Variables and Slow Transients

Murphy

Chatterjee

Kaplan

et al. 2013

Publ. Astron. Soc. Aust.

115

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The Australian Square Kilometre Array Pathfinder (ASKAP) will give us an unprecedented opportunity to investigate the transient sky at radio wavelengths. In this paper we present VAST, an ASKAP survey for Variables and Slow Transients. VAST will exploit the wide-field survey capabilities of ASKAP to enable the discovery and investigation of variable and transient phenomena from the local to the cosmological, including flare stars, intermittent pulsars, X-ray binaries, magnetars, extreme scattering events, interstellar scintillation, radio supernovae, and orphan afterglows of gamma-ray bursts. In addition, it will allow us to probe unexplored regions of parameter space where new classes of transient sources may be detected. In this paper we review the known radio transient and variable populations and the current results from blind radio surveys. We outline a comprehensive program based on a multi-tiered survey strategy to characterise the radio transient sky through detection and monitoring of transient and variable sources on the ASKAP imaging timescales of 5 s and greater. We also present an analysis of the expected source populations that we will be able to detect with VAST.

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High and Low Galactic Latitude Radio Transients in the Nasu 1.4 GHz Wide-Field Survey

Cited by 23 publications

References 18 publications

Science with the Murchison Widefield Array

Science with the Murchison Widefield Array

Reliability of Radio Transients Detected in the Nasu Sky Survey

VAST: An ASKAP Survey for Variables and Slow Transients

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