期刊
ASTRONOMY & ASTROPHYSICS
卷 658, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202142242
关键词
stars; neutron
资金
- European Research Council under the European Union [617199]
- NWO, the Dutch Research Council [639.043.815]
- Deutsche Forschungsgemeinschaft (DFG) [433075039]
- European Union H2020 ERC Consolidator Grant Binary Massive Black Hole Astrophysics (B Massive) [818691]
- Netherlands eScience Center (NLeSC) [ASDI.15.406]
- NWO Veni Fellowship
- Natural Sciences and Engineering Research Council of Canada (NSERC) [CITA 490888-16]
- Station de Radioastronomie de Nancay
- CNRS-INSU
- Observatoire de Paris-PSL
- Universite d'Orleans
- Observatoire des Sciences de l'Univers en Region Centre
- Region Centre-Val de Loire
- DIM-ACAV
- DIM-ACAV+ of Region Ile-de-France
- Agence Nationale de la Recherche
- Region Centre-Val de Loire, departement du Cher
- NWO [614.061.613]
- Netherlands Research School for Astronomy [NOVA4-ARTS, NOVA-NW3, NOVA5-NW3-10.3.5.14]
- European Research Council (ERC) [818691] Funding Source: European Research Council (ERC)
This article investigates the properties and fluence variability of single pulses in PSR B0950+08, suggesting that temporal variation of the interstellar medium plays a significant role. The article also discovers spectral features resembling fast radio bursts and highlights the potential relevance of further studying the fluence variability in understanding the nature of FRBs.
PSR B0950+08 is a bright nonrecycled pulsar whose single-pulse fluence variability is reportedly large. Based on observations at two widely separated frequencies, 55 MHz (NenuFAR) and 1.4 GHz (Westerbork Synthesis Radio Telescope), we review the properties of these single pulses. We conclude that they are more similar to ordinary pulses of radio emission than to a special kind of short and bright giant pulses, observed from only a handful of pulsars. We argue that a temporal variation of the properties of the interstellar medium along the line of sight to this nearby pulsar, namely the fluctuating size of the decorrelation bandwidth of diffractive scintillation makes an important contribution to the observed single-pulse fluence variability. We further present interesting structures in the low-frequency single-pulse spectra that resemble the sad trombones seen in fast radio bursts (FRBs); although for PSR B0950+08 the upward frequency drift is also routinely present. We explain these spectral features with radius-to-frequency mapping, similar to the model developed by Wang et al. (2019, ApJ, 876, L15) for FRBs. Finally, we speculate that mu s-scale fluence variability of the general pulsar population remains poorly known, and that its further study may bring important clues about the nature of FRBs.
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