Candidate radio supernova remnants observed by the GLEAM survey over 345° &lt;<i>l</i>&lt; 60° and 180° &lt;<i>l</i>&lt; 240°

Hurley‐Walker, N.; Gaensler, B. M.; Leahy, D. A.; Filipović, Miroslav; Hancock, P. J.; Franzen, T. M. O.; Offringa, A. R.; Callingham, J. R.; Hindson, L.; Wu, Chen; Bell, M. E.; For, Bi-Qing; Johnston‐Hollitt, M.; Kapińska, A. D.; Morgan, John S.; Murphy, Tara; McKinley, B.; Procopio, P.; Wayth, R. B.; Zheng, C.

doi:10.1017/pasa.2019.33

Cited by 28 publications

(28 citation statements)

References 108 publications

(171 reference statements)

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“…In addition to the Green SNRs we included the candidate SNR G354.4+0.0 [42] as in Ref. [9], although a recent multi-instrument comparison [49] argues that it is probably an HII region. As in Ref.…”

Section: B Target Listmentioning

confidence: 99%

Directed searches for continuous gravitational waves from twelve supernova remnants in data from Advanced LIGO’s second observing run

Lindblom

Owen

2020

Phys. Rev. D

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We describe directed searches for continuous gravitational waves from twelve well localized nonpulsing candidate neutron stars in young supernova remnants using data from Advanced LIGO's second observing run. We assumed that each neutron star is isolated and searched a band of frequencies from 15 to 150 Hz, consistent with frequencies expected from known young pulsars. After coherently integrating spans of data ranging from 12.0 to 55.9 days using the F-statistic and applying data-based vetoes, we found no evidence of astrophysical signals. We set upper limits on intrinsic gravitational wave amplitude in some cases stronger than 10 −25 , generally about a factor of two better than upper limits on the same objects from Advanced LIGO's first observing run.

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Section: B Target Listmentioning

confidence: 99%

Directed searches for continuous gravitational waves from twelve supernova remnants in data from Advanced LIGO’s second observing run

Lindblom

Owen

2020

Phys. Rev. D

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“…To measure flux densities, we used the measure_source.py tool, b in which a polygon is drawn around the source (Hurley-Walker et al 2019). Estimated uncertainties include a noise term and also the uncertainty in the flux density scale for each measurement.…”

Section: Measurement Of Flux Density and Spectral Indexmentioning

confidence: 99%

Unexpected circular radio objects at high Galactic latitude

Norris

Intema

Kapińska

et al. 2021

Publ. Astron. Soc. Aust.

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We have found a class of circular radio objects in the Evolutionary Map of the Universe Pilot Survey, using the Australian Square Kilometre Array Pathfinder telescope. The objects appear in radio images as circular edge-brightened discs, about one arcmin diameter, that are unlike other objects previously reported in the literature. We explore several possible mechanisms that might cause these objects, but none seems to be a compelling explanation.

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“…LoLSS will image a large fraction of the northern Galactic Plane, thereby completing a census of supernova remnants (SNR). This will enable a search for the long-predicted and missing population of the oldest SNR, whose strongly rising low frequency spectra and large angular scales are not visible at higher frequencies (Driessen et al 2018;Hurley-Walker et al 2019). The combination of LoLSS and LoTSS data will be important in identifying emission from Hii regions whose morphology is similar to that of SNRs, whilst having a flatter spectrum.…”

Section: The Milky Waymentioning

confidence: 99%

The LOFAR LBA Sky Survey

Gasperin

Williams

Best

et al. 2021

A&A

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Context. The LOw Frequency ARray (LOFAR) is the only radio telescope that is presently capable of high-sensitivity, high-resolution (i.e. < 1 mJy beam −1 and < 15) observations at ultra-low frequencies (< 100 MHz). To utilise these capabilities, the LOFAR Surveys Key Science Project is undertaking a large survey to cover the entire northern sky with Low Band Antenna (LBA) observations. Aims. The LOFAR LBA Sky Survey (LoLSS) aims to cover the entire northern sky with 3170 pointings in the frequency range between 42 − 66 MHz, at a resolution of 15 and at a sensitivity of 1 mJy beam −1 (1σ). In this work, we outline the survey strategy, the observational status, and the calibration techniques. We also briefly describe several of our scientific motivations and present the preliminary public data release. Methods. The preliminary images were produced using a fully automated pipeline aimed at correcting all direction-independent effects in the data. Whilst the direction-dependent effects, such as those from the ionosphere, have not yet been corrected, the images presented in this work are still ten times more sensitive than previous available surveys at these low frequencies. Results. The preliminary data release covers 740 deg 2 around the HETDEX spring field region at an angular resolution of 47 with a median noise level of 5 mJy beam −1. The images and the catalogue of 25,247 sources have been publicly released. We demonstrate that the system is capable of reaching a root mean square (rms) noise of 1 mJy beam −1 and an angular resolution of 15 once directiondependent effects are accounted for. Conclusions. LoLSS will provide the ultra-low-frequency information for hundreds of thousands of radio sources, providing critical spectral information and producing a unique data set that can be used for a wide range of science topics, such as the search for high redshift galaxies and quasars, the study of the magnetosphere of exoplanets, and the detection of the oldest populations of cosmic-rays in galaxies, clusters of galaxies, as well as those produced by active galactic nuclei (AGN).

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Candidate radio supernova remnants observed by the GLEAM survey over 345° <l< 60° and 180° <l< 240°

Cited by 28 publications

References 108 publications

Directed searches for continuous gravitational waves from twelve supernova remnants in data from Advanced LIGO’s second observing run

Directed searches for continuous gravitational waves from twelve supernova remnants in data from Advanced LIGO’s second observing run

Unexpected circular radio objects at high Galactic latitude

The LOFAR LBA Sky Survey

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