scholarly journals The hunt for new pulsars with the Green Bank Telescope

2012 ◽  
Vol 8 (S291) ◽  
pp. 41-46
Author(s):  
Ryan S. Lynch
Keyword(s):  
Globular Clusters ◽  
Binary Systems ◽  
Radio Pulsars ◽  
Large Area ◽  
Pulsar Timing ◽  
Drift Scan ◽  
Radio Transients ◽  
Pulsar Searches ◽  
Green Bank Telescope ◽  
Rotating Radio Transients

AbstractThe Green Bank Telescope (GBT) is the largest fully steerable radio telescope in the world and is one of our greatest tools for discovering and studying radio pulsars. Over the last decade, the GBT has successfully found over 100 new pulsars through large-area surveys. Here I discuss the two most recent—the GBT 350 MHz Drift-scan survey and the Green Bank North Celestial Cap survey. The primary science goal of both surveys is to find interesting individual pulsars, including young pulsars, rotating radio transients, exotic binary systems, and especially bright millisecond pulsars (MSPs) suitable for inclusion in Pulsar Timing Arrays, which are trying to directly detect gravitational waves. These two surveys have combined to discover 85 pulsars to date, among which are 14 MSPs and many unique and fascinating systems. I present highlights from these surveys and discuss future plans. I also discuss recent results from targeted GBT pulsar searches of globular clusters and Fermi sources.

scholarly journals Discoveries of Rotating Radio Transients in the 350 MHz Green Bank Telescope Drift-scan Survey

2012 ◽  
Vol 8 (S291) ◽  
pp. 107-110
Author(s):  
Chen Karako-Argaman ◽  
Keyword(s):  
Radio Emission ◽  
Post Processing ◽  
Drift Scan ◽  
Radio Transients ◽  
Processing Techniques ◽  
Pulsar Searches ◽  
Green Bank Telescope ◽  
Rotating Radio Transients

AbstractRotating Radio Transients (RRATs) are a class of pulsars characterized by sporadic bursts of radio emission, which make them difficult to detect in typical periodicity-based pulsar searches. Using newly developed post-processing techniques for automatically identifying single bright astrophysical pulses, such as those emitted from RRATs, we have discovered approximately 30 new RRAT candidates in data from the Green Bank Telescope 350 MHz drift-scan survey. A total of 6 of these have already been confirmed and the remainder look extremely promising. Here we describe these techniques and present the most recent results on these new RRAT candidates.

scholarly journals GREENBURST: A commensal Fast Radio Burst search back-end for the Green Bank Telescope

2019 ◽  
Vol 36 ◽  
Author(s):  
Mayuresh P. Surnis ◽  
D. Agarwal ◽  
D. R. Lorimer ◽  
X. Pei ◽  
G. Foster ◽  
...  
Keyword(s):  
Radio Burst ◽  
High Sensitivity ◽  
Pixel Detector ◽  
Search System ◽  
Dispersion Measures ◽  
Fast Radio Burst ◽  
Radio Transients ◽  
Green Bank Telescope ◽  
Single Pixel ◽  
Rotating Radio Transients

Abstract We describe the design and deployment of GREENBURST, a commensal Fast Radio Burst (FRB) search system at the Green Bank Telescope. GREENBURST uses the dedicated L-band receiver tap to search over the 960–1 920 MHz frequency range for pulses with dispersion measures out to $10^4\ \rm{pc\,cm}^{-3}$ . Due to its unique design, GREENBURST is capable of conducting searches for FRBs when the L-band receiver is not being used for scheduled observing. This makes it a sensitive single pixel detector capable of reaching deeper in the radio sky. While single pulses from Galactic pulsars and rotating radio transients will be detectable in our observations, and will form part of the database we archive, the primary goal is to detect and study FRBs. Based on recent determinations of the all-sky rate, we predict that the system will detect approximately one FRB for every 2–3 months of continuous operation. The high sensitivity of GREENBURST means that it will also be able to probe the slope of the FRB fluence distribution, which is currently uncertain in this observing band.

Parameters of radio pulsars in binary systems and globular clusters

2017 ◽  
Vol 61 (2) ◽  
pp. 115-121
Author(s):  
A. A. Loginov ◽  
I. F. Malov
Keyword(s):  
Globular Clusters ◽  
Binary Systems ◽  
Radio Pulsars

scholarly journals A 20 cm Search for Pulsars in Globular Clusters with Arecibo and the GBT

2004 ◽  
Vol 218 ◽  
pp. 131-132
Author(s):  
J. W. T. Hessels ◽  
S. M. Ransom ◽  
I. H. Stairs ◽  
V. M. Kaspi ◽  
P. C. C. Freire ◽  
...  
Keyword(s):  
Puerto Rico ◽  
West Virginia ◽  
Globular Clusters ◽  
Binary Systems ◽  
Millisecond Pulsars ◽  
Search Data ◽  
L Band ◽  
Green Bank Telescope

We are conducting deep searches for radio pulsations at L-band (∼ 20 cm) towards more than 30 globular clusters (GCs) using the 305 m Arecibo telescope in Puerto Rico and the 100 m Green Bank Telescope in West VirginiA. With roughly three quarters of our search data analyzed, we have discovered 12 new millisecond pulsars (MSPs), 11 of which are in binary systems, and at least three of which eclipse. We have timing solutions for several of these systems.

scholarly journals Pulsar searches in nearby dwarf spheroidal galaxies

2012 ◽  
Vol 8 (S291) ◽  
pp. 111-114 ◽  
Author(s):  
Eduardo Rubio-Herrera ◽  
Thomas Maccarone
Keyword(s):  
Neutron Stars ◽  
Radio Pulsars ◽  
Dwarf Spheroidal Galaxies ◽  
Comprehensive Survey ◽  
Dispersion Measures ◽  
Periodic Signals ◽  
Satellite Galaxies ◽  
Radio Transients ◽  
Pulsar Searches ◽  
Millisecond Radio

AbstractWe have been undertaking a comprehensive survey for pulsars and fast radio transients in the dwarf spheroidal satellite galaxies of the Milky Way using the Green Bank Radio Telescope operating at a central frequency of 350 MHz. Our search pipeline allows the detection of periodical signals and single dispersed pulses and it is optimized to search for millisecond radio pulsars. Here we present preliminary results of the searches we have conducted in the Ursa Minoris, Draco and Leo I dwarf spheroidal satellite galaxies. Our searches have revealed no periodic signals but a few unconfirmed millisecond single pulses at various dispersion measures, possibly related to neutron stars. Detecting neutron stars in these systems can potentially help to test the existence of haloes of dark matter surrounding these systems as predicted by Dehnen & King (2006).

scholarly journals Probing fundamental physics with pulsars

2009 ◽  
Vol 5 (H15) ◽  
pp. 131-136
Author(s):  
Duncan R. Lorimer ◽  
Maura A. McLaughlin
Keyword(s):  
Large Scale ◽  
Radio Pulsars ◽  
Fundamental Physics ◽  
Superdense Matter ◽  
Pulsar Timing ◽  
Binary Evolution ◽  
Radio Transients ◽  
Pulsar Timing Array ◽  
Review Current ◽  
Pulsar Evolution

AbstractPulsars provide a wealth of information about General Relativity, the equation of state of superdense matter, relativistic particle acceleration in high magnetic fields, the Galaxy's interstellar medium and magnetic field, stellar and binary evolution, celestial mechanics, planetary physics and even cosmology. The wide variety of physical applications currently being investigated through studies of radio pulsars rely on: (i) finding interesting objects to study via large-scale and targeted surveys; (ii) high-precision timing measurements which exploit their remarkable clock-like stability. We review current surveys and the principles of pulsar timing and highlight progress made in the rotating radio transients, intermittent pulsars, tests of relativity, understanding pulsar evolution, measuring neutron star masses and the pulsar timing array

scholarly journals Pulsar Timing and the Detection of Black Hole Binary Systems in Globular Clusters

2005 ◽  
Vol 627 (2) ◽  
pp. L125-L128 ◽  
Author(s):  
Fredrick A. Jenet ◽  
Teviet Creighton ◽  
Andrea Lommen
Keyword(s):  
Black Hole ◽  
Globular Clusters ◽  
Binary Systems ◽  
Pulsar Timing ◽  
Black Hole Binary

scholarly journals Milky Way globular clusters in γ-rays: analysing the dynamical formation of millisecond pulsars

2019 ◽  
Vol 486 (1) ◽  
pp. 851-867 ◽  
Author(s):  
Raniere de Menezes ◽  
Fabio Cafardo ◽  
Rodrigo Nemmen
Keyword(s):  
Globular Clusters ◽  
Binary Systems ◽  
Milky Way ◽  
Dwarf Galaxies ◽  
Formation Rate ◽  
Necessary Condition ◽  
Encounter Rate ◽  
Large Area ◽  
Millisecond Pulsars ◽  
Γ Ray

ABSTRACT Globular clusters (GCs) are evolved stellar systems containing entire populations of millisecond pulsars (MSPs), which are efficient γ-ray emitters. Observations of this emission can be used as a powerful tool to explore the dynamical processes leading to binary system formation in GCs. In this work, 9 yr of Fermi Large-Area Telescope data were used to investigate the γ-ray emission from all GCs in the Milky Way. Twenty-three clusters were found as γ-ray bright, with two of them never having been reported before. It was also found that magnetic braking probably has a smaller impact on the formation rate of binary systems in metal-rich GCs than previously suggested, while a large value for the two-body encounter rate seems to be a necessary condition. The influence of the encounter rate per formed binary was for the first time explored in conjunction with γ-ray data, giving evidence that if this quantity is very high, binary systems will get destroyed before having time to evolve into MSPs, thus decreasing the total number of MSPs in a GC. No extended emission was found even for clusters whose optical extent is ≈0.5°; all of them are point-like sources spatially in agreement with the optical cores of the GCs, supporting previous X-ray results of heavier objects sinking into the clusters’ cores via dynamical friction. The possibility of extrapolating these results to ultra-compact dwarf galaxies is discussed, as these systems are believed to be the intermediate case between GCs and dwarf galaxies.

scholarly journals New timing solutions for RRATs

2012 ◽  
Vol 8 (S291) ◽  
pp. 366-368
Author(s):  
Bingyi Cui ◽  
Jason Boyles ◽  
Maura McLaughlin ◽  
Nipuni Palliyaguru
Keyword(s):  
Single Pulse ◽  
Search Method ◽  
Radio Transients ◽  
Green Bank Telescope ◽  
Rotating Radio Transients

AbstractThe rotating radio transients are sporadic pulsars which are difficult to detect through periodicity searches. By using a single-pulse search method, we can discover these sources, measure their periods, and determine timing solutions. Here we introduce our results on six RRATs based on Parkes and Green Bank Telescope (GBT) observations, along with a comparison of the spin-down properties of RRATs and normal pulsars.

scholarly journals A GPU based single-pulse search pipeline (GSP) with database and its application to the Commensal Radio Astronomy FAST Survey (CRAFTS)

2022 ◽  
Vol 21 (12) ◽  
pp. 314
Author(s):  
Shan-Ping You ◽  
Pei Wang ◽  
Xu-Hong Yu ◽  
Xiao-Yao Xie ◽  
Di Li ◽  
...  
Keyword(s):  
Radio Astronomy ◽  
Data Streams ◽  
Single Pulse ◽  
Wide Band ◽  
Radio Bursts ◽  
Learning Tools ◽  
Radio Pulsars ◽  
Real Time Processing ◽  
Radio Transients ◽  
Rotating Radio Transients

Abstract We developed a GPU based single-pulse search pipeline (GSP) with a candidate-archiving database. Largely based upon the infrastructure of the open source PulsaR Exploration and Search Toolkit (PRESTO), GSP implements GPU acceleration of the de-dispersion and integrates a candidate-archiving database. We applied GSP to the data streams from the Commensal Radio Astronomy FAST Survey (CRAFTS), which resulted in quasi-real-time processing. The integrated candidate database facilitates synergistic usage of multiple machine-learning tools and thus improves efficient identification of radio pulsars such as rotating radio transients (RRATs) and fast radio bursts (FRBs). We first tested GSP on pilot CRAFTS observations with the FAST Ultra-Wide Band (UWB) receiver. GSP detected all pulsars known from the the Parkes multibeam pulsar survey in the corresponding sky area covered by the FAST-UWB. GSP also discovered 13 new pulsars. We measured the computational efficiency of GSP to be ∼120 times faster than the original PRESTO and ∼60 times faster than an MPI-parallelized version of PRESTO.

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