New Discoveries from the Arecibo 327 MHz Drift Pulsar Survey Radio Transient Search

Abstract

We present Clusterrank, a new algorithm for identifying dispersed astrophysical pulses. Such pulses are commonly detected from Galactic pulsars and rotating radio transients (RRATs), which are neutron stars with sporadic radio emission. More recently, isolated, highly dispersed pulses dubbed fast radio bursts (FRBs) have been identified as the potential signature of an extragalactic cataclysmic radio source distinct from pulsars and RRATs. Clusterrank helped us discover 14 pulsars and 8 RRATs in data from the Arecibo 327 MHz Drift Pulsar Survey (AO327). The new RRATs have DMs in the range $23.5-86.6$ pc cm${}^{-3}$ and periods in the range $0.172-3.901$ s. The new pulsars have DMs in the range $23.6-133.3$ pc cm${}^{-3}$ and periods in the range $1.249-5.012$ s, and include two nullers and a mode-switching object. We estimate an upper limit on the all-sky FRB rate of $10^5$ day${}^{-1}$ for bursts with a width of 10 ms and flux density $\gtrsim 83$ mJy. The DMs of all new discoveries are consistent with a Galactic origin. In comparing statistics of the new RRATs with sources from the RRATalog, we find that both sets are drawn from the same period distribution. In contrast, we find that the period distribution of the new pulsars is different from the period distributions of canonical pulsars in the ATNF catalog or pulsars found in AO327 data by a periodicity search. This indicates that Clusterrank is a powerful complement to periodicity searches and uncovers a subset of the pulsar population that has so far been underrepresented in survey results and therefore in Galactic pulsar population models.

arXiv comment41 pages, 16 figures, 4 tables, accepted by ApJ; added minor corrections to final ApJ proof

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Cited by in corpus (31)

• Fast Radio Bursts
• The FAST Galactic Plane Pulsar Snapshot survey: I. Project design and pulsar discoveries
• LOFAR discovery of a 23.5-second radio pulsar
• Detection of Repeating FRB 180916.J0158+65 Down to Frequencies of 300 MHz
• Pulsar J1411+2551: A Low Mass New Double Neutron Star System
• A Search for Fast Radio Bursts with the GBNCC Pulsar Survey
• Pulse Morphology of the Galactic Center Magnetar PSR J1745-2900
• Single-pulse classifier for the LOFAR Tied-Array All-sky Survey
• Jiamusi pulsar observations: III. Nulling of 20 pulsars
• The FAST Galactic Plane Pulsar Snapshot survey: VI. The discovery of 473 new pulsars
• The FAST Galactic Plane Pulsar Snapshot Survey: II. Discovery of 76 Galactic rotating radio transients and their enigma
• Detection of Five New RRATs at 111 MHz
• Post-Outburst Radio Observations of the High Magnetic Field Pulsar PSR J1119-6127
• Detection of 25 new rotating radio transients at 111 MHz
• Radio Pulsar Sub-Populations (I) : The Curious Case of Nulling Pulsars
• First Discovery of a Fast Radio Burst at 350 MHz by the GBNCC Survey
• Detecting fast radio bursts at decametric wavelengths
• The Green Bank Northern Celestial Cap Pulsar Survey II: The Discovery and Timing of Ten Pulsars
• Explaining the statistical properties of Fast Radio Bursts with suppressed low-frequency emission
• The CRAFT Coherent (CRACO) upgrade I: System Description and Results of the 110-ms Radio Transient Pilot Survey
• Limits on Absorption from a 332-MHz survey for Fast Radio Bursts
• Peering into the Milky Way by FAST: III. Magnetic fields in the Galactic halo and farther spiral arms revealed by the Faraday effect of faint pulsars
• Pushchino multibeams pulsar search. IV. Detection of new pulsars at declinations -9o < δ< +55o
• The LOFAR search for radio pulsars and fast transients in M33, M81 & M82
• Revisiting Pushchino RRAT search using neural network
• Search for fast radio transients using Arecibo drift-scan observations at 1.4 GHz
• Polarized radio emission of RRAT J1854+0306
• Search for pulsars in an area with coordinates 3h < α< 4h and +21o < δ< +42o
• Scintillation Bandwidth Measurements from 23 Pulsars from the AO327 Survey
• HAWC J0630+186 Could Not Be Powered by PSR J0630+19
• Constraining the selection corrected luminosity function and total pulse count for radio transients