FAST-GPPS newly discovered pulsars

FAST Detection of Dwarf pulses


Dwarf pulses, a novel pulse population uncovered by FAST, shed lights on unknown nulling mechanism in pulsar magnetosphere.

We detected a group of sporadic emissions during the nulling periods of PSR B2111+46 using FAST and named them "dwarf pulses". We also presented the first polarization measurement results of these pulses. The linear polarization positional angle (PA) values of dwarf pulses almost align with the average PA curve the integrated pulse. Additionally, we found that the frequency spectrum of dwarf pulses is more likely to have a positive spectral index compared to normal and partially nulling pulses. This discovery is significant for studying the nulling mechanism of pulsars, and the subsequent polarization analysis can provide insights into the magnetosphere state during pulsar nulling.


Fig.1: Pulses of PSR B2111+46. Dwarf pulse is shown in (c) plot.

Fig.2: Population of pulses of PSR B2111+46. The fluence, peak flux and width of pulses are shown. Three short observation sessions are combined, and one long observation are analyzed alone.

Fig.3: Frequency-time waterfall plot of four pulse, see our paper for details.

Data release:
We released processed FAST data of PSR B2111+46, including profile data and frequency-time waterfall plots.


Table 1: Data for time-phase plots of PSR B2111+46 from the GPPS survey
Data type
B2111pulses.tar.gz 		Description
B2111_20200824_bin512.CF Time-phase plot of B2113+46 in 2020.08.24 with 512 phase bin per period.
B2111_20200826_bin512.CF Time-phase plot of B2113+46 in 2020.08.26 with 512 phase bin per period.
B2111_20200917_bin512.CF Time-phase plot of B2113+46 in 2020.0917 with 512 phase bin per period.
B2111_20220308_bin512.CF Time-phase plot of B2113+46 in 2022.0308 with 512 phase bin per period.
B2111_20220308_bin20643.CF Time-phase plot of B2113+46 in 2022.0308 in original sampling speed.

Table 2: Data for dwarf pulses of PSR B2111+46 published in the paper.
Data type
B2111specs.tar.gz 		Description
B2111_20220308_c256_bin20643.pulseNo237.CF Spectrum of pulse 237
B2111_20220308_c256_bin20643.pulseNo369.CF Spectrum of pulse 369
B2111_20220308_c256_bin20643.pulseNo2453.CF Spectrum of pulse 2453
B2111_20220308_c256_bin20643.pulseNo3766.CF Spectrum of pulse 3766


If you want to get more data, you are welcome to contact authors.
Please do cite properly to :
X. Chen et al, 2023, Radio emission from thunderstorm and raindrops of particles in magnetoshpere, Nature Astronomy
(Published PDF )

(JLHan, XChen & YYan @ 2023-05-26)