A 3 Jy Radio Burst at a High Galactic Latitude

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

doi:10.1086/512970

Cited by 34 publications

(44 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We review several recent discoveries of radio transients with durations between minutes to days (Kuniyoshi et al 2006a;Bower et al 2007;Niinuma et al 2007;Kida et al 2008). We suggest that these radio transients may be generated by a single class of progenitors.…”

Section: Discussionmentioning

confidence: 97%

“…These authors reported 11 bright radio transients (and several others were mentioned but without details), with flux density above 1 Jy in the 1.4 GHz band. Ten were singleepoch transients while one was detected on two successive days with flux densities of 1.7 and 3.2 Jy, respectively (Niinuma et al 2007). In each epoch, the transients were detected for about four minutes, which is the drift scanning time, and did not exhibit any significant variation within the observation.…”

Section: Introductionmentioning

confidence: 99%

“…Separately, Kuniyoshi et al (2006aKuniyoshi et al ( , 2006bKuniyoshi et al ( , 2007, Niinuma et al (2007Niinuma et al ( , 2009, Kida et al (2008), and Matsumura et al (2009) reported on a search for radio transients using an 518 OFEK ET AL.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Long-Duration Radio Transients Lacking Optical Counterparts Are Possibly Galactic Neutron Stars

Ofek

Breslauer

Gal‐Yam

et al. 2010

ApJ

View full text Add to dashboard Cite

Recently, a new class of radio transients in the 5 GHz band and with durations of the order of hours to days, lacking any visible-light counterparts, was detected by Bower and collaborators. We present new deep near-infrared (IR) observations of the field containing these transients, and find no counterparts down to a limiting magnitude of K = 20.4 mag. We argue that the bright (>1 Jy) radio transients recently reported by Kida et al. are consistent with being additional examples of the Bower et al. transients. We refer to these groups of events as "long-duration radio transients." The main characteristics of this population are: timescales longer than 30 minutes but shorter than several days; very large rate, ∼10 3 deg −2 yr −1 ; progenitor's sky surface density of >60 deg −2 (at 95% confidence) at Galactic latitude ∼40 • ; 1.4-5 GHz spectral slopes, f ν ∝ ν α , with α 0; and most notably the lack of any X-ray, visible-light, near-IR, and radio counterparts in quiescence. We discuss putative known astrophysical objects that may be related to these transients and rule out an association with many types of objects including supernovae, gamma-ray bursts, quasars, pulsars, and M-dwarf flare stars. Galactic brown dwarfs or some sort of exotic explosions in the intergalactic medium remain plausible (though speculative) options. We argue that an attractive progenitor candidate for these radio transients is the class of Galactic isolated old neutron stars (NSs). We confront this hypothesis with Monte Carlo simulations of the space distribution of old NSs, and find satisfactory agreement for the large areal density. Furthermore, the lack of quiescent counterparts is explained quite naturally. In this framework, we find: the mean distance to events in the Bower et al. sample is of order kpc; the typical distance to the Kida et al. transients are constrained to be between 45 pc and 2 kpc (at the 95% confidence level); these events should repeat with a timescale of order several months; and sub-mJy level bursts should exhibit Galactic latitude dependence. We discuss two possible mechanisms giving rise to the observed radio emission: incoherent synchrotron emission and coherent emission. We speculate that if the latter is correct, the long-duration radio transients are sputtering ancient pulsars or magnetars and will exhibit pulsed emission.

show abstract

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Long-Duration Radio Transients Lacking Optical Counterparts Are Possibly Galactic Neutron Stars

Ofek

Breslauer

Gal‐Yam

et al. 2010

ApJ

View full text Add to dashboard Cite

show abstract

“…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%

Reliability of Radio Transients Detected in the Nasu Sky Survey

Aoki

Tanaka

Niinuma

et al. 2013

ApJ

View full text Add to dashboard Cite

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.

show abstract

“…Here, n is the data point and nΔt represents the observation time. Furthermore, we calibrated the receiver gain fluctuation by using our developed gain calibration system after obtaining the data (Niinuma et al 2007a). When a radio source passes an antenna making up the interferometer, a fringe appears in the data.…”

Section: Observation Datamentioning

confidence: 99%

Rapid Fringe Detection Technique for Discovering Radio Transients in Nasu Drift-scan Data

Tanaka

Nakamizo²,

Aoki³

et al. 2013

Publications of the Astronomical Society of the Pacific

Self Cite

View full text Add to dashboard Cite

ABSTRACT. This article describes a rapid fringe detection technique for detecting fringes that appear transiently in Nasu observational data. It can quickly and accurately detect fringe waveforms that are not derived from steady sources in the drift-scan data according to constant numerical criteria. A fringe is considered to be a radio transient fringe if the signal-to-noise ratio of each data point is above a threshold for a specific period of time. Such fringes are searched for in the region unaffected by fringes due to steady sources in the observational data, which is determined by using the expectation data generated from an earlier survey catalog. Using the proposed technique, a computer can detect radio transient fringe using numerical criteria, thereby shortening the time required to discover transient signals. Therefore, by reducing the analysis time, we will be able to identify temporal flux variations in radio transients by follow-up observation immediately after detection.

show abstract

A 3 Jy Radio Burst at a High Galactic Latitude

Abstract: A radio burst lasting up to 72 hr at a high Galactic latitude was detected by interferometric drift-scanning observation using an eight-element, 20 m diameter fixed spherical dish array at the Waseda Nasu Pulsar Observatory in Japan.

Cited by 34 publications

References 18 publications

Long-Duration Radio Transients Lacking Optical Counterparts Are Possibly Galactic Neutron Stars

Long-Duration Radio Transients Lacking Optical Counterparts Are Possibly Galactic Neutron Stars

Reliability of Radio Transients Detected in the Nasu Sky Survey

Rapid Fringe Detection Technique for Discovering Radio Transients in Nasu Drift-scan Data

Contact Info

Product

Resources

About