Radiation Study on the Radio Pulsars with a Low Spin-down Energy Loss Rate
Abstract
The radiation theory of pulsar suggests that when the induced electric field and voltage caused by the rotated magnetic field of the neutron star decrease, which can not produce enough electron and positron pairs, the radio radiation of the pulsar will disappear, i.e., ``die". This paper analyzes the space distributions and the physical properties such as the spin periods of the 34 sources under the ``death line", i.e., the radio pulsars with a low spin-down energy loss rate. Firstly, these pulsars are all in the galactic field, which show no obvious correlation with the special types of pulsars and the pulsars with a high-energy radiation; Secondly, these pulsars locate in the low galactic latitude and near the solar system; Thirdly, these pulsars show the relative larger characteristic ages and larger spin periods; Last, the radio luminosity of 1400 MHz and the spin-down power \dot{E} of these pulsars show a weak correlation. We argue that the radio pulsars with a low spin-down power may loss energy due to radiation, causing the deceleration of the spin, whose \dot{E} decreases below the ``death line". We suggest that the survey for the radio pulsars with a low spin-down power should focus on the old and long spin period radio sources in the galactic field, and it is unnecessary to focus on the special type of the pulsars or the certain spatial positions. The Five-hundred-meter Aperture Spherical radio Telescope (FAST) running at present in our country has the relatively higher sensitivity, which is supposed to observe more radio pulsars with a low spin-down power.
- Publication:
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Acta Astronomica Sinica
- Pub Date:
- March 2019
- Bibcode:
- 2019AcASn..60...10W
- Keywords:
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- pulsars: general;
- stars: neutron;
- radio radiation