期刊
ASTRONOMY & ASTROPHYSICS
卷 634, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201833555
关键词
pulsars; individual; Crab pulsar; gamma rays; stars; radio continuum; stars; radiation mechanisms; non-thermal
资金
- ASTRON/JIVE Helena Kluyver female visitor program
- Netherlands Foundation for Scientific Research (NWO)
- German BMBF
- German MPG
- Italian INFN
- Italian INAF
- Swiss National Fund SNF
- ERDF under the Spanish MINECO [FPA2015-69818-P, FPA2012-36668, FPA2015-68378-P, FPA201569210-C6-2-R, FPA2015-69210-C6-4-R, FPA2015-69210-C6-6-R, AYA201571042-P, AYA2016-76012-C3-1-P, ESP2015-71662-C2-2-P, CSD2009-00064]
- Japanese JSPS
- Japanese MEXT
- Spanish Centro de Excelencia Severo Ochoa [SEV-20120234, SEV-2015-0548]
- Unidad de Excelencia Maria de Maeztu [MDM2014-0369]
- Croatian Science Foundation (HrZZ) [09/176]
- University of Rijeka [13.12.1.3.02]
- DFG Collaborative Research Centers [SFB823/C4, SFB876/C3]
- Polish National Research Centre grant [UMO-2016/22/M/ST9/00382]
- Brazilian MCTIC
- Brazilian CNPq
- Brazilian FAPERJ
Aims. The aim of this study is to search for evidence of a common emission engine between radio giant pulses (GPs) and very-high-energy (VHE, E& x2004;> & x2004;100 GeV) gamma-rays from the Crab pulsar. Methods. We performed 16 h of simultaneous observations of the Crab pulsar at 1.4 GHz with the Effelsberg radio telescope and the Westerbork Synthesis Radio Telescope (WSRT), and at energies above 60 GeV we used the Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC) telescopes. We searched for a statistical correlation between the radio and VHE gamma-ray emission with search windows of different lengths and different time lags to the arrival times of a radio GP. A dedicated search for an enhancement in the number of VHE gamma-rays correlated with the occurrence of radio GPs was carried out separately for the P1 and P2 phase ranges, respectively. Results. In the radio data sample, 99444 radio GPs were detected. We find no significant correlation between the GPs and VHE photons in any of the search windows. Depending on phase cuts and the chosen search windows, we find upper limits at a 95% confidence level on an increase in VHE gamma-ray events correlated with radio GPs between 7% and 61% of the average Crab pulsar VHE flux for the P1 and P2 phase ranges, respectively. This puts upper limits on the flux increase during a radio GP between 12% and 2900% of the pulsed VHE flux, depending on the search window duration and phase cuts. This is the most stringent upper limit on a correlation between gamma-ray emission and radio GPs reported so far.
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