Constraints on the Low-frequency Radio Emission of the Galactic Fast Radio Burst Source SGR 1935+2154
11 affiliations
- 1Nanjing University
- 2Chinese Academy of Sciences
- 3University of Chinese Academy of Sciences
- 4Lebedev Physical Institute of Astro Space Center of Pushchino Radio Astronomy Observatory
- 5Beijing Normal University
- 6Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University)
- 7Institute of Mathematical Problems of Biology
- 8Guangxi University
- 9State Key Laboratory of Radio Astronomy and Technology
- 10Xinjiang Key Laboratory of Radio Astrophysics
- 11Nanjing University of Information Science and Technology
Abstract
We present a search for radio pulses from the Galactic magnetar SGR 1935+2154, a well-known source of fast radio bursts (FRBs), at ∼110 MHz using the Large Phased Array (LPA) of the Pushchino Radio Astronomy Observatory. Data from two active periods in 2020 (March–May and September–November, with ∼3.5 minutes of daily coverage) were analyzed with new methods tailored to both FRB-like single pulses and pulsar-like periodic signals. No significant FRB-like pulses were found. Using Monte Carlo simulations, 3 σ upper limits were derived for the burst rate: for a lognormal energy distribution the limit is ∼10 1.5 day ⁻¹ for a mean of average monochromatic isotropic luminosity L ν ,mean ∼ 1.3 × 10 ²⁹ erg s ⁻¹ Hz ⁻¹ and a natural log-space scatter of σ ∼ 0.85; while for a power-law distribution it is ∼10 1.8 day ⁻¹ for an index β ≲ 3.0 and a minimum average monochromatic isotropic luminosity L ν , min ≲ 0.7 × 10 25 erg s − 1 Hz − 1 . When folded at the known 3.24781628 s period of SGR 1935+2154, a weak pulse was noted (S/N < 3.16), but the significance is insufficient for a secure detection of the pulsar-like emission signal. A conservative upper limit on the average monochromatic isotropic luminosity of any possible periodic emission is 2.08 × 10 ¹⁹ erg s ⁻¹ Hz ⁻¹ . Our results offer meaningful low-frequency upper limits on the burst rate of SGR 1935+2154, and hint at very faint pulsar-like radiation at meter wavelengths.
Related
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BibTeX
@article{胡2026constraints,
title = {{Constraints on the Low-frequency Radio Emission of the Galactic Fast Radio Burst Source SGR 1935+2154}},
author = {Chen-Ran 宸然 Hu 胡 and Jinhuang 锦煌 Cao 曹 and S. A. Tyul’bashev and Pei 培 Wang 王 and Yong-Feng 永锋 Huang 黄 and E.A. Brylyakova and G.E. Tyul’basheva and Jin-Jun 金军 Geng 耿 and Orkash 热卡西·艾麦提 Amat 吾 and Ze-Cheng 泽城 Zou 邹 and Chen 琛 Du 杜 and Nurimangul 尔曼古丽·努尔麦麦提 Nurmamat 努 and Lang 朗 Cui 崔 and Fan 帆 Xu 许 and Xiao-Fei 小飞 Dong 董 and Chen 晨 Deng 邓},
journal = {The Astrophysical Journal},
year = {2026},
month = oct,
doi = {10.3847/1538-4357/aea8f6},
url = {https://iopscience.iop.org/article/10.3847/1538-4357/aea8f6},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Constraints on the Low-frequency Radio Emission of the Galactic Fast Radio Burst Source SGR 1935+2154
AU - Chen-Ran 宸然 Hu 胡
AU - Jinhuang 锦煌 Cao 曹
AU - S. A. Tyul’bashev
AU - Pei 培 Wang 王
AU - Yong-Feng 永锋 Huang 黄
AU - E.A. Brylyakova
AU - G.E. Tyul’basheva
AU - Jin-Jun 金军 Geng 耿
AU - Orkash 热卡西·艾麦提 Amat 吾
AU - Ze-Cheng 泽城 Zou 邹
AU - Chen 琛 Du 杜
AU - Nurimangul 尔曼古丽·努尔麦麦提 Nurmamat 努
AU - Lang 朗 Cui 崔
AU - Fan 帆 Xu 许
AU - Xiao-Fei 小飞 Dong 董
AU - Chen 晨 Deng 邓
PY - 2026
DA - 2026/10/13
JO - The Astrophysical Journal
DO - 10.3847/1538-4357/aea8f6
UR - https://iopscience.iop.org/article/10.3847/1538-4357/aea8f6
AB - We present a search for radio pulses from the Galactic magnetar SGR 1935+2154, a well-known source of fast radio bursts (FRBs), at ∼110 MHz using the Large Phased Array (LPA) of the Pushchino Radio Astronomy Observatory. Data from two active periods in 2020 (March–May and September–November, with ∼3.5 minutes of daily coverage) were analyzed with new methods tailored to both FRB-like single pulses and pulsar-like periodic signals. No significant FRB-like pulses were found. Using Monte Carlo simulations, 3 σ upper limits were derived for the burst rate: for a lognormal energy distribution the limit is ∼10 1.5 day ⁻¹ for a mean of average monochromatic isotropic luminosity L ν ,mean ∼ 1.3 × 10 ²⁹ erg s ⁻¹ Hz ⁻¹ and a natural log-space scatter of σ ∼ 0.85; while for a power-law distribution it is ∼10 1.8 day ⁻¹ for an index β ≲ 3.0 and a minimum average monochromatic isotropic luminosity L ν , min ≲ 0.7 × 10 25 erg s − 1 Hz − 1 . When folded at the known 3.24781628 s period of SGR 1935+2154, a weak pulse was noted (S/N < 3.16), but the significance is insufficient for a secure detection of the pulsar-like emission signal. A conservative upper limit on the average monochromatic isotropic luminosity of any possible periodic emission is 2.08 × 10 ¹⁹ erg s ⁻¹ Hz ⁻¹ . Our results offer meaningful low-frequency upper limits on the burst rate of SGR 1935+2154, and hint at very faint pulsar-like radiation at meter wavelengths.
SN - 0004-637X
SN - 1538-4357
ER -