Science with an ngVLA: The ngVLA Reference Design

Selina, Robert; Murphy, E. J.; McKinnon, Mark; Beasley, A. J.; Butler, B. J.; Carilli, C. L.; Clark, Barry A. J.; Durand, S.; Erickson, A. E.; Hiriart, R.; Grammer, W.; Jackson, J.; Kent, Brian D.; Mason, Brian D.; Morgan, Matthew A.; Ojeda, Omar Yeste; Rosero, Viviana; Shillue, Bill; Sturgis, Silver; Urbain, Denis

doi:10.48550/arxiv.1810.08197

Cited by 6 publications

(1 citation statement)

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“…In 2018, UWL, an ultra-wideband receiver covering 704-4032 MHz, was put into use in the Parkes Pulsar timing array project, and its timing accuracy was significantly improved (Hobbs et al 2020). The frequency coverage of a single radio telescope can range from centimeters to millimeters to meet the needs of extremely wide spectral-line observations, for example, the ngVLA project plans to cover the frequency range from 1.2 to 116 GHz by multiple UWB receivers (Selina et al 2018), with a maximum frequency ratio of 4:1 and a bandwidth of 36 GHz for a single receiver.…”

Section: Introductionmentioning

confidence: 99%

QTT Ultra-wideband Signal Acquisition and Baseband Data Recording System Design Based on the RFSoC Platform

Pei¹,

Li²,

Duan³

et al. 2023

PASP

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The 110 m QiTai radio Telescope (QTT) will be equipped with multiple Ultra-WideBand (UWB) receivers in the primary and Gregory focus to achieve continuous frequency coverage from 270 MHz to 115 GHz, which poses great challenges to signal acquisition, transmission, and real-time processing. Aiming at 10 GHz and above full-bandwidth acquisition and multi-scientific processing for the QTT UWB signals, an experimental system with high-speed signal acquisition, 100 Gb network multi-path distribution, and fast recording is designed by using advanced direct RF-sampling technology and heterogeneous architecture. The system employs a ZCU111 board to digitize dual-polarization signals with a sampling rate of 4.096 GigaSamples-Per-Second and 12-bit quantization. The collected wideband signals are channelized into 2048 chunks, which are then assembled into 16 sets of digital narrow basebands with 128 MHz bandwidth and transmitted to the processing servers through two 100 Gb ports. A HASPIPE pipeline, UWB_HASHPIPE is designed to receive and store multiple subbands in parallel. Data distribution links can be flexibly configured based on IP addresses and port numbers. The system is verified by pulsar observation experiments on the Nanshan 26 m telescope. 512 MHz bandwidth is selected from the collected L-band receiver signals and recorded in VDIF file format with 8 parallel instances. The test results show that the data integrity is excellent, and the signal-to-noise ratio of the band-merged pulsar profile is stronger than single subband data. This paper provides a high-performance and flexible solution for the design of versatile UWB backends. Meanwhile, the developed platform can be integrated into QTT backends for baseband data collection and Very Long Baseline Interferometry observation.

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Section: Introductionmentioning

confidence: 99%

QTT Ultra-wideband Signal Acquisition and Baseband Data Recording System Design Based on the RFSoC Platform

Pei¹,

Li²,

Duan³

et al. 2023

PASP

View full text Add to dashboard Cite

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Too small to fail: characterizing sub-solar mass black hole mergers with gravitational waves

Wolfe,

Vitale,

Talbot

2023

J. Cosmol. Astropart. Phys.

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The detection of a sub-solar mass black hole could yield dramatic new insights into the nature of dark matter and early-Universe physics, as such objects lack a traditional astrophysical formation mechanism. Gravitational waves allow for the direct measurement of compact object masses during binary mergers, and we expect the gravitational-wave signal from a low-mass coalescence to remain within the LIGO frequency band for thousands of seconds. However, it is unclear whether one can confidently measure the properties of a sub-solar mass compact object and distinguish between a sub-solar mass black hole or other exotic objects. To this end, we perform Bayesian parameter estimation on simulated gravitational-wave signals from sub-solar mass black hole mergers to explore the measurability of their source properties. We find that the LIGO/Virgo detectors during the O4 observing run would be able to confidently identify sub-solar component masses at the threshold of detectability; these events would also be well-localized on the sky and may reveal some information on their binary spin geometry. Further, next-generation detectors such as Cosmic Explorer and the Einstein Telescope will allow for precision measurement of the properties of sub-solar mass mergers and tighter constraints on their compact-object nature.

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Bursts from Space: MeerKAT – the first citizen science project dedicated to commensal radio transients

Andersson¹,

Lintott²,

Fender³

et al. 2023

Monthly Notices of the Royal Astronomical Society

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The newest generation of radio telescopes is able to survey large areas with high sensitivity and cadence, producing data volumes that require new methods to better understand the transient sky. Here, we describe the results from the first citizen science project dedicated to commensal radio transients, using data from the MeerKAT telescope with weekly cadence. Bursts from Space: MeerKAT was launched late in 2021 and received ∼89 000 classifications from over 1000 volunteers in 3 months. Our volunteers discovered 142 new variable sources which, along with the known transients in our fields, allowed us to estimate that at least 2.1 per cent of radio sources are varying at 1.28 GHz at the sampled cadence and sensitivity, in line with previous work. We provide the full catalogue of these sources, the largest of candidate radio variables to date. Transient sources found with archival counterparts include a pulsar (B1845-01) and an OH maser star (OH 30.1–0.7), in addition to the recovery of known stellar flares and X-ray binary jets in our observations. Data from the MeerLICHT optical telescope, along with estimates of long time-scale variability induced by scintillation, imply that the majority of the new variables are active galactic nuclei. This tells us that citizen scientists can discover phenomena varying on time-scales from weeks to several years. The success both in terms of volunteer engagement and scientific merit warrants the continued development of the project, while we use the classifications from volunteers to develop machine learning techniques for finding transients.

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Science with an ngVLA: The ngVLA Reference Design

Cited by 6 publications

References 0 publications

QTT Ultra-wideband Signal Acquisition and Baseband Data Recording System Design Based on the RFSoC Platform

QTT Ultra-wideband Signal Acquisition and Baseband Data Recording System Design Based on the RFSoC Platform

Too small to fail: characterizing sub-solar mass black hole mergers with gravitational waves

Bursts from Space: MeerKAT – the first citizen science project dedicated to commensal radio transients

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