AndreaBozzo/ceres-open-data-index huggingface dataset:
Parkes observations for project P1238 semester 2024OCTS_09

Young and energetic pulsars can power strong pulsar wind nebula (PWN), which can be observed from radio to X-ray and beyond. Leveraging the sensitivity and high-resolution of next-generation radio surveys like ASKAP EMU and SARAO MeerKAT 1.3 GHz Galactic Plane Survey (SMGPS), we are now able to identify pulsar candidates associated with PWNe and SNRs. We can then use these PWN and SNR associations to guide our search of radio pulsars. This strategy was demonstrated successful by our recent discoveries of two high dispersion measure (DM) pulsars powering a bow-shocked PWNe using ASKAP EMU radio continuum images. Recently, we analysed several SMGPS fields and identified seven PWNe candidates potentially associated to three new and four known Galactic SNRs. Here we propose to use the Parkes UWL receiver to carry out the targeted search of radio pulsars powering these PWNe. Since these SNRs are located in Galactic plane and can be distant, we expect them to have large DMs. Such high DMs will lead to strong scattering and smearing and make pulsars undetectable in previous pulsar surveys. The wide frequency coverage of UWL, especially the high frequencies, will allow us to avoid these effects and therefore offer us a better chance to find these pulsars.

Organization: CSIRO Data Access Portal
Parkes observations for project P1321 semester 2024OCTS_07

We propose to search for temporal variations in HI absorption spectra seen against background pulsars to characterise Tiny Scale Atomic Structure (TSAS) in the Milky Way interstellar medium (ISM). We will re-observe seven previously studied bright pulsars at two observing epochs in this semester, resulting in minimum and maximum experimental baselines of 0.25 and 50 years. These observations will test predictions that there is a minimum size scale set by the thermal and turbulent properties of the ISM, below which TSAS is only sporadically seen, and will potentially provide the first direct measurements of pressures in "large" TSAS features of &gt; 1000 AU.  By using a new phase-resolved spectral line mode that we have recently implemented on Parkes, we will cut data rates and processing times by factors of ~1000. This project successfully observed in 2024APR and will be expanded to a Long Term Project when that scheme reopens for applications in 2025APR. Successful demonstration of our techniques will lay the groundwork for future programmes on the SKA.

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Parkes observations for project P1328 semester 2024OCTS_19

Fast radio bursts are peculiar micro-millisecond duration transients, which have been seen to be extragalactic in origin. Since their discovery, a dichotomy has emerged in their population. Some FRBs have been seen to be repeating, while others have not been seen to be repeating. The repeating FRBs, such as FRB 20180301A, provide an unparalleled window into their circumburst environment due to their repeating nature, which can be used to constrain possible progenitor models and test underlying emission mechanisms. Additionally, FRB 20180301A has been seen to have interesting polarisation properties, such as a switch in the sign of RM, indicating a reversal in the magnetic field and a marked reduction in the linear polarisation fraction towards lower frequencies (depolarisation). The previous Parkes/Murriyang source follow-up has also revealed a temporal evolution in the dispersion measure (DM) of the source and tentative evidence for correlation in the DM and rotation measure (RM). The ultra-wideband low (UWL) receiver on Parkes/Murriyang is ideally suited to explore the wideband spectro-temporal and polarimetric behaviour of the source. We propose regular monitoring of FRB 20180301A using UWL to model the magnetic field evolution, study its circumburst media using depolarisation behaviour, and constrain any correlation of DM and RM.

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Parkes observations for project P1317 semester 2024OCTS_06

The existence of a population of millisecond pulsars (MSPs) in the Galactic bulge is supported, among others, by the Fermi GeV excess, a signal of gamma rays coming from the Galactic center (GC) direction and resembling the cumulative emission of known MSPs. A previous study showed that, while these MSPs are unresolved in gamma rays, some of them could have been detected in past X-ray observations. The authors also identified a large number of MSP candidates among unidentified X-ray sources. By analyzing unpublished radio images, we found interesting radio counterparts to 6 of those candidates, and were granted 20h of observations with the Green Bank Telescope to settle on their nature. We discovered two new MSPs, PSR J1740-2807 and PSR J1740-2805, towards one of our radio/X-ray targets, bringing to 4 the number of highly-dispersed MSPs in the GC direction and probably unveiling the first direct evidence of a bulge MSP population. We propose to carry out regular timing of these pulsar with Parkes, in order to reveal their properties and potentially claim association of PSR J1740-2807 with the original X-ray source. The follow up of these sources will have a major impact on our understanding of the Fermi GeV excess.

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Parkes observations for project P1334 semester 2024OCTS_06

The Galactic Centre is the most complex and dynamic region of our Galaxy.  Radio images have revealed a plethora of filamentary structures that trace out magnetic fields running perpendicular to the Galactic plane. Exactly what powers the radio emission of these filaments had remained a mystery, until the serendipitous discovery of a pulsar embedded in one. With a spin-period of 8.4 ms, PSR J1744-2946 is the first ever millisecond pulsar to be discovered in the central region of our Galaxy. While an exciting discovery in its own right, the limited timing baseline leaves open several unanswered questions: How efficiently is the pulsar injecting energy into the radio filament? Could the pulsar be included in pulsar timing array experiments? And can it be used as a key component in the search for axion dark matter? In this proposal we will use the Ultra-Wideband Low receiver system on Murriyang to conduct regular, monthly observations of PSR J1744-2946. This will provide us with a measurement of the pulsar spin-down rate and a sense of its long-term stability, thereby providing answers to the questions posed above.

Organization: CSIRO Data Access Portal
Parkes observations for project P1330 semester 2024OCTS_06

We discovered PSR J1716-2808A (NGC6316A), a highly accelerated binary millisecond pulsar (MSP), in NGC6316. We are currently observing it with Parkes (P1330) to solve for the orbit. At the time of this proposal submission, we have not yet solved the orbit. We have 6 scheduled observations in August 2024, which we expect to provide a good orbital solution to use in the proposed observations for this proposal. The goal of the proposed observations is to conduct a year long timing campaign. This is crucial to break the timing degeneracy that occurs between the pulsar's position and the pulsar's spindown rate. We will be able to use this to connect the pulsar to our previous observations spanning back to 2022. This will also confirm whether the pulsar is a part of the cluster. A secondary advantage of having these observations is that the data can also be used to search for faint pulsars via stack searching and time any new pulsars that are discovered in any subsequent observations.

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Parkes observations for project P1335 semester 2024OCTS_06

We request six observations for ASKAP~J1832--0911, a 44-minute Ultra-long period object, with Murriyang ultra-wide-bandwidth low-frequency receiver (UWL). The proposed observation can help us measure and understand different kinds of sub-structures of the pulse over a wide frequency range. The observation can also serve as a pilot observation to develop a method to measure wide pulses with a single-dish telescope. This observation will help us measure the physical parameters of the source and its surrounding environment, and will also help us map the system geometry so that we can model the emission mechanism.

Organization: CSIRO Data Access Portal
Parkes observations for project P1344 semester 2024OCTS_07

Fast radio bursts (FRBs) are millisecond-duration radio bursts of extragalactic origin. Since the discovery of the first FRB in the archival Parkes/Murriyang multibeam data, a broad dichotomy in population has emerged. Some FRBs have been seen to be repeating, while others are not, despite a significant amount of follow-up using different radio telescopes. The commissioning of new dedicated FRB detection systems has led to an exponential increase in the detected FRBs over the last decade. Despite &gt;700 FRBs published to date, there is still a lack of understanding about the physical mechanisms through which FRB emission is produced. Due to the possibility of detecting multiple bursts from the same source in a repeating FRB, it forms an ideal sample set to uncover the physics of the source (e.g., emission mechanism, progenitor surrounding media), and test possible progenitor models. The coherent upgrade to the FRB detection system to ASKAP is expected to detect ~1 FRB/week. However, due to the limited fractional bandwidth available with ASKAP and survey nature of the telescope, probing the spectro-polarimetric characteristics of repeating sources is non-optimal. Hence, the large bandwidth offered by the ultra wideband-low (UWL) on Parkes/Murriyang is an ideal instrument to follow-up repeating FRB sources discovered through CRACO. We propose using the unallocated time/Green Time on UWL to follow up repeater-like sources to study their wideband spectro-polarimetric characteristics.

Organization: CSIRO Data Access Portal
Parkes observations for project P1343 semester 2024OCTS_01

Fast radio bursts (FRBs) are millisecond-duration radio bursts of extragalactic origin. Since the discovery of the first FRB in the archival Parkes/Murriyang multibeam data, a broad dichotomy in population has emerged. Some FRBs have been seen to be repeating, while others are not, despite a significant amount of follow-up using different radio telescopes. The commissioning of new dedicated FRB detection systems has led to an exponential increase in the detected FRBs over the last decade. Despite &gt;700 FRBs published to date, there is still a lack of understanding about the physical mechanisms through which FRB emission is produced. Due to the possibility of detecting multiple bursts from the same source in a repeating FRB, it forms an ideal sample set to uncover the physics of the source (e.g., emission mechanism, progenitor surrounding media), and test possible progenitor models. The coherent upgrade to the FRB detection system to ASKAP is expected to detect ~1 FRB/week. However, due to the limited fractional bandwidth available with ASKAP and survey nature of the telescope, probing the spectro-polarimetric characteristics of repeating sources is non-optimal. Hence, the large bandwidth offered by the ultra wideband-low (UWL) on Parkes/Murriyang is an ideal instrument to follow-up repeating FRB sources discovered through CRACO. Over the next ~6 months, we expect to double the number of repeaters that have been studied through the UWL. This will provide unprecedented insight into the progenitor environment and the surrounding media of repeating FRBs. We propose using the UWL to follow up repeater-like sources to study their wideband spectro-polarimetric characteristics.

Organization: CSIRO Data Access Portal
Parkes observations for project P1336 semester 2024OCTS_05

This proposal aims to confirm the periodic radio pulsations of the polarised sources identified in the MeerKAT Bulge imaging survey. Discovering pulsars through blind single-dish radio surveys and traditional search methods can be impractical due to excess pulse smearing towards the Galactic center and the steep-spectrum nature of the pulsars. However, targeted searches on pulsar candidates discovered in imaging surveys based on their polarization properties are proving to be an extremely useful alternative. Given their potential visibility primarily at higher frequencies due to the less pronounced effect of scattering at these frequencies, the Ultra Wide Low Band (UWL) receiver of the Parkes Radio Telescope (Murriyang) is the most promising instrument to confirm their pulsar nature. We hence request Parkes/Murriyang UWL observations of these candidates to search for pulsations.

Organization: CSIRO Data Access Portal
Parkes observations for project P1342 semester 2024OCTS_03

We have discovered an eclipsing binary millisecond pulsar in image-plane searches. Follow-up work confirmed that the source has pulsations and a Fermi association, revealing that it is a millisecond pulsar (MSP). The MSP is in a compact binary orbit with an optical companion. The duration of the eclipses suggests that this is a ``spider'' system, with an eclipsing material. The formation and evolution of spider systems are still poorly understood. Timing of this system will allow us to constrain the orbit of the system so that we can explore the eclipse cut-off frequency and change in electron column density of the eclipse. It would also improve predictions of the eclipsing binary pulsar and MSP population detectable by upcoming, highly sensitive image-plane surveys at low frequencies using precursors to, and eventually, the Square Kilometre Array (SKA) itself. The detection of MSPs also provides compelling evidence that the Fermi gamma-ray excess is coming from thousands of MSPs.

Organization: CSIRO Data Access Portal
Parkes observations for project P1338 semester 2024OCTS_55

Fast radio bursts (FRBs) are millisecond-duration radio bursts of extragalactic origin. Since the discovery of the first FRB in the archival Parkes/Murriyang multibeam data, a broad dichotomy in population has emerged. Some FRBs have been seen to be repeating, while others are not, despite a significant amount of follow-up using different radio telescopes. The repeating FRB 20240114A was recently discovered by CHIME/FRB, which has been seen to have an exceptionally high burst activity. Such extreme burst activity has not been seen in any other source. The repeating FRBs, such as FRB 20240114A, provide an unparalleled window into their circumburst environment due to their repeating nature, which can be used to constrain possible progenitor models and test underlying emission mechanisms. The previous Parkes/Murriyang source follow-up has also revealed intriguing spectro-polarimetric properties, such as frequency-dependent evolution of burst central frequency or chromaticity, a possible activity window, significantly large circular polarisation (CP), and frequency-dependent CP. These properties hold the key towards understanding the circumburst environment of the FRBs, and test possible progenitor models. A large bandwidth instrument with reliable polarimetry has been critical in uncovering these properties. The ultra-wideband low (UWL) receiver on Parkes/Murriyang is ideally suited to explore the source's wideband spectro-temporal and polarimetric behaviour. We propose a campaign to regularly follow up FRB 20240114A to ascertain its long-term evolution of spectro-temporal properties.

Organization: CSIRO Data Access Portal
Parkes observations for project P1345 semester 2024OCTS_15

This proposal aims to obtain timing solutions and constrain burst rates and spin down properties of a sample of new rotating radio transients (RRATs) discovered with the ASKAP CRAFT Coherent upgrade (CRACO) system. 
  In the last 6-months of commissioning, CRACO discovered and localised 10 new RRATs, identified by their sporadic pulses with dispersion measures (DM) consistent with Galactic objects. 
We request 15h of Parkes time split into three 30min observations spanning 6-months for each target. 
  This will allow us to constrain phase-coherent timing solutions given that we already have arcsec-precision interferometric localisations. 
  Our main science goals are: 
  1) to measure their burst rates, periods, and spin-down properties;
  2) to assess their nulling fraction and emission mechanism
  3) to determine if the CRACO RRATs are different to the known RRATs population.

Organization: CSIRO Data Access Portal
LBA observations for project V191 semester 2019OCTS

HD 93129A is one of the hottest, most massive and luminous binary systems in the Galaxy, with a period longer than 100 yr. Non-thermal emission was reported with the ATCA, along with a ~30% flux increase between 2003 and 2009 from our current monitoring. The emission was interpreted as mainly coming from a colliding-wind region, which was mapped with the LBA. Optical studies indicate that the system is about to hit periastron in ~1 yr time, when we anticipate (i) radio flux shaped by free-free absorption at the colliding-wind region, (ii) unprecedented hard X-ray outbursts and (iii) probably gamma-ray emission. We propose to monitor HD 93129A with the LBA to trace the morphological changes from its emission along two 7-h epochs at S band and two epochs at C band. The evolution of its emission would allow us to unveil the orbital motion of the two stars (and thus clarify when the periastron passage takes place). The data would also allow us to characterize the wind colliding region and stellar winds around periastron. All this information would provide constraints to the current models that predit when the high energy emission would take place and could be observable by the current facilities. HD 93129A could become the second colliding wind binary exhibiting gamma-ray emission after Eta Car (and the only one displaying simultaneously non-thermal radio emission), challenging the limits on the highest energies that a wind collision region can exhibit.

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Parkes observations for project PX500 semester 2024OCTS_17

This proposal relates to time purchased by the Chinese Academy of Sciences for Parkes follow-up confirmation and timing of FAST discoveries.  As the observing time has been purchased this proposal (and the related PX501) does not require TAC grading.  The primary reason for submitting a proposal is to ensure an outreach statement and that the proposal is entered into OPAL for the data archive to access. The Chinese team have two time requests. The time scheduled for the first, relating to this proposal, will be allocated in blocks of 24 hours and the data will become available in the data archive with an 18 month embargo period.  The second type of time will be scheduled in shorter blocks and the data archived with a 10 year embargo.

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Parkes observations for project P1347 semester 2024OCTS_05

A MeerKAT imaging survey of the Galactic Center and Bulge region yielded the detections of 39 known pulsars and 30 pulsar candidates. The candidates were identified primarily as steep-spectrum, circularly- and/or linearly-polarized sources, and to a lesser degree by the level of radio variability observed. We have chosen nine pulsar candidates to target in this proposal. These sources are the most pulsar-like of the MeerKAT point sources (based on their polarization, spectral index, and variability) that also have large enough flux densities to make a firm detection of pulsations if present. We propose to observe these nine candidates twice, for 1.5 hr each, in the 2024OCT semester.

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Parkes observations for project PX600 semester 2020APRS_116

The Galactic Center (GC) is a key target for the radio component of Breakthrough Listen (BL) program. Offering the largest amount of stars in any given direction in the sky, the GC is widely cited as a location believed to harbour advanced civilizations, and it is also the most energetic region in the Milky Way. We aim to conduct BL-GC Survey with Parkes radio telescope for around 350 hours. We will cover the frequency range from 700 MHz to 4 GHz, utilizing the newly installed ultra-wideband receiver. Our team has already leveraged both standard and bespoke tools to construct a flexible software stack to search data for signals of interest. We will look for signals from extraterrestrial intelligence (ETI) by searching for both simple narrow-band signals and complex modulated signals. Along with that, as an ancillary science, we will also search for accelerated pulsars — likely orbiting a supermassive black hole at the centre of the Milky Way Galaxy. Data products produced during this program will also be publically available to engage larger pulsar community

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LBA observations for project V603 semester 2021APRS

We propose a LBA NAPA program to localise a repeating Fast Radio Burst, FRB190520, in collaboration with FAST and the Tianma 65m telescope. Our current observations show that FRB190520 is extremely active with a relatively stable burst rate, and is therefore ideal for very long baseline interferometry (VLBI) localisation. LBA will be triggered when a VLBI session using FAST and Tianma is scheduled. Combining the high sensitivity of FAST and long baselines of these telescopes, we aim to achieve milli-arcsecond level localisation of FRB190520, which will allow us to identify its host galaxy and any association of local structures. These information will greatly improve our understanding of FRBs progenitors and their local environment.

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LBA observations for project V578 semester 2019OCTS

Blazars are radio-loud active galactic nuclei whose jets point very close to the line of sight. High-resolution VLBI observations can provide the ultimate evidence for the blazar nature of a source, by revealing the compact, bright, high brightness temperature core with flat radio spectrum. Zywucka et al. (2018) selected the blazar candidates from the Magellanic Quasar Survey. The selection method based mainly on the optical variability and the radio-loudness of the sources. Using the infrared color-color selection for blazars derived from the data of the WISE satellite by Massaro et al. (2012) we found that 10 of the 27 WISE-detected sources are outside of the blazar gamma-ray strip. We propose to observe 7 sources from these list and additional 7 sources as a control sample which fall within the blazar strip. We want to compare the mas-scale properties of the two samples to asses whether (i) additional criteria is needed select blazar sources (ii) and if yes the WISE color-color criteria is able to improve the selection method. Optical emission and variability is thought to be dominated by the beamed jet in blazars while in non-beamed (and not radio-loud) sources it originates in the accretion disks thus governed by accretion processes. Therefore, if the physical mechanism causing the optical variability is intended to be studies the nature of the variable source is important to be ascertained.

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LBA observations for project V576 semester 2020OCTS

The nearest AGB star R Dor is one of the best targets of VLTI and ALMA for the study of the physical, chemical, and dynamical properties of the AGB star. There are controversies on if there is strong wind acceleration or slower wind in its circumstellar environment (CSE), and if the measured rotation is from the rotating star of a rotating disk. Therefore, we propose multi-epoch phase-referencing LBA observations of 22 GHz H2O masers toward R Dor to measure their 3D kinematics. This project can provide (1) the transverse velocity to verify the rotation, and (2) the proper motions and possible acceleration in CSE, which also will show the maser kinematics dominated by radial expansion or collimated jets.

Organization: CSIRO Data Access Portal