Searching for Transient Pulses with the ETA Radio Telescope

Patterson, Cameron; Ellingson, S.W.; Martin, B.; Deshpande, K.; Simonetti, J. H.; Kavic, Michael; Cutchin, S.

doi:10.1145/1462586.1462589

Cited by 7 publications

(6 citation statements)

References 21 publications

(26 reference statements)

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“…All of these attempts have suffered from constraints inherent in narrowband receivers and simple transient identification systems. More modern projects like GASE and ETA (Morales et al 2005; Patterson et al 2009) were designed to correct many of these problems, with digital baseband recording and interference rejection through de-dispersion, but the collecting areas are still very small.…”

Section: Time-domain Astrophysicsmentioning

confidence: 99%

Science with the Murchison Widefield Array

Bowman

Cairns

Kaplan

et al. 2013

Publ. Astron. Soc. Aust.

315

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: Time-domain Astrophysicsmentioning

confidence: 99%

Science with the Murchison Widefield Array

Bowman

Cairns

Kaplan

et al. 2013

Publ. Astron. Soc. Aust.

315

181

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“…Recently, it was suggested [12] that superconducting strings might best be detected in radio transient searches since the event rate for low frequency signals is much larger than that of high frequency signals. Furthermore, ¶ UMR 7164-CNRS, Université Denis Diderot-Paris 7, CEA, Observatoire de Paris * ycai21@asu.edu † Eray.Sabancilar@asu.edu ‡ steer@apc.univ-paris7.fr § tvachasp@asu.edu there is increasing interest in the detection of radio transients [17][18][19][20][21]. More detailed analyses were carried out in Ref.…”

Section: Introductionmentioning

confidence: 99%

Radio broadcasts from superconducting strings

et al. 2012

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Superconducting cosmic strings can give transient electromagnetic signatures that we argue are most evident at radio frequencies. We investigate the three different kinds of radio bursts from cusps, kinks, and kink-kink collisions on superconducting strings. We find that the event rate is dominated by kink bursts in a range of parameters that are of observational interest, and can be quite high (several a day at 1 Jy flux) for a canonical set of parameters. In the absence of events, the search for radio transients can place stringent constraints on superconducting cosmic strings.

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“…If the string parameters are such that the power lost to electromagnetic radiation is larger than that to gravitational radiation, we should replace the expression for gravitational power emission, 100Gµ 2 , by the electromagnetic power 10I √ µ. This occurs when I > 1.2 × 10 8 µ There are several radio telescopes currently in operation searching for radio transients, e.g., Parkes [3], ETA [4], LWA [5], LOFAR [6], and others under construction, e.g., SKA [7]. It would be useful to tailor the analysis in our paper to the specific range of observational parameters that will be employed in these searches.…”

Section: Discussionmentioning

confidence: 99%

“…We transform the event rate from source variables to observer variables. These results will be useful in the ongoing search for radio transients at the Parkes [3], ETA [4], and LWA [5] telescopes, and the new generation large radio telescopes such as LOFAR [6] and SKA [7]. This paper is organized as follows.…”

mentioning

confidence: 99%

Radio bursts from superconducting strings

2012

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We show that radio bursts from cusps on superconducting strings are linearly polarized, thus, providing a signature that can be used to distinguish them from astrophysical sources. We write the event rate of string-generated radio transients in terms of observational variables, namely, the event duration and flux. Assuming a canonical set of observational parameters, we find that the burst event rate can be quite reasonable, e.g., order ten a year for Grand Unified strings with 100 TeV currents, and a lack of observed radio bursts can potentially place strong constraints on particle physics models.PACS numbers: 98.80. Cq, 11.27.+d, 95.85.Bh, 95.85.Fm Cosmic strings are possible relics from the early Universe. Their discovery would substantiate our hot big bang cosmological model and also provide tremendous insight into the nature of fundamental interactions.There are a number of different ways to look for cosmic strings, mostly based on their gravitational interactions, and negative searches so far impose constraints on particle physics models and cosmology. If the strings are superconducting [1], their electromagnetic emission provides yet another signature that can be used to search for them. The electromagnetic emission from a cosmic string loop is not steady and can have sharp bursts that can be seen as transient events. In Ref.[2], it was pointed out that it might be fruitful to look for superconducting strings by searching for bursts at radio wavelengths. There is a simple reason for choosing to look in the radio band. Cosmic strings are large objects and their fundamental frequency of emission is very low. The power emitted at higher frequencies generally falls off with increasing harmonic. Thus, there is more power emitted in the radio than in other bands such as the optical. Also, as we shall see in Sec. I, the emission in the burst is beamed, with the beam being widest at lower frequencies. Thus, the event rate in radio bursts can be expected to be larger than those at higher frequencies. On the other hand, propagation effects in the radio band are stronger, and these have to be included when evaluating the signature.Besides superconducting cosmic strings, there are other strong motivations for looking at transient radio phenomenon from pulsars, supernovae, black hole evaporation, gamma-ray bursts, active galactic nuclei, and extra-terrestrial life. A radio burst from a superconducting cosmic string will have to be distinguished among bursts from other potential astrophysical sources. With this in mind, we recalculate the characteristics of the string burst and show that it is linearly polarized in a direction that is independent of the frequency.The feasibility of observations depends on the event * Electronic address: ycai21@asu.edu † Electronic address: Eray.Sabancilar@asu.edu ‡ Electronic address: tvachasp@asu.edu rates for radio bursts. Here, we focus on evaluating the event rate in variables that are most useful to observers. The burst at source occurs with a certain duration and flux. However...

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Searching for Transient Pulses with the ETA Radio Telescope

Cited by 7 publications

References 21 publications

Science with the Murchison Widefield Array

Science with the Murchison Widefield Array

Radio broadcasts from superconducting strings

Radio bursts from superconducting strings

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