Upper limits on the radio pulses from magnetars and a central compact object with FAST
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arXiv
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2024
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| author | Lu, Wan-Jin Zhou, Ping Wang, Pei Shao, Yi-Xuan Li, Xiang-Dong Vink, Jacco Li, Di Chen, Yang |
| author_facet | Lu, Wan-Jin Zhou, Ping Wang, Pei Shao, Yi-Xuan Li, Xiang-Dong Vink, Jacco Li, Di Chen, Yang |
| contents | Magnetars and central compact objects (CCOs) are subgroups of neutron stars that show a number of properties distinguished from canonical radio pulsars. We performed radio observations of three magnetars SGR 0418+5729, 1E 2259+586, 4U 0142+61, and a CCO PSR J1852+0040 with the Fivehundred-meter Aperture Spherical radio Telescope (FAST) at 1.25 GHz, aiming to search for radio pulsations in their quiescent states. During two observation epochs, no radio pulses have been detected towards any target above a significance of signal-to-noise ratio (S/N) = 7 from either the direct folding or blind search. We provided the most stringent upper limit of radio flux (<~ 2 -- 4 $μ$Jy) for the magnetars and the CCO. For the magnetars with long periods, the real upper limits are likely an order of magnitude larger due to the red noise. The deep radio observations suggest that these magnetars and the CCO are indeed radio-quiet sources or unfavorably beamed. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2402_05647 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Upper limits on the radio pulses from magnetars and a central compact object with FAST Lu, Wan-Jin Zhou, Ping Wang, Pei Shao, Yi-Xuan Li, Xiang-Dong Vink, Jacco Li, Di Chen, Yang High Energy Astrophysical Phenomena Solar and Stellar Astrophysics Magnetars and central compact objects (CCOs) are subgroups of neutron stars that show a number of properties distinguished from canonical radio pulsars. We performed radio observations of three magnetars SGR 0418+5729, 1E 2259+586, 4U 0142+61, and a CCO PSR J1852+0040 with the Fivehundred-meter Aperture Spherical radio Telescope (FAST) at 1.25 GHz, aiming to search for radio pulsations in their quiescent states. During two observation epochs, no radio pulses have been detected towards any target above a significance of signal-to-noise ratio (S/N) = 7 from either the direct folding or blind search. We provided the most stringent upper limit of radio flux (<~ 2 -- 4 $μ$Jy) for the magnetars and the CCO. For the magnetars with long periods, the real upper limits are likely an order of magnitude larger due to the red noise. The deep radio observations suggest that these magnetars and the CCO are indeed radio-quiet sources or unfavorably beamed. |
| title | Upper limits on the radio pulses from magnetars and a central compact object with FAST |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2402.05647 |