NAOC Open IR
fastultrawidebandobservationofabnormalemissionshifteventsofpsrb091906
Yu Yezhao1; Peng Bo1; Liu Kuo2; Zhang Chengmin1; Wang Lin1; Kou Feifei1; Lu Jiguang1; Yu Meng1
2019
Source Publicationsciencechinaphysicsmechanicsastronomy
ISSN1674-7348
Volume62Issue:5
AbstractPSR B0919+06 is known for its abnormal emission phenomenon, where the pulse emission window occasionally shifts progres-sively in longitude and returns afterwards. The physical mechanism behind this phenomenon is still under investigation. In this paper, we present our ultra-wideband observation of this pulsar using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), with simultaneous measurements in the frequency ranges 280-780 and 1250-1550 MHz. We have identified three ab-normal events, each of which becomes less apparent as the frequency decreases. At 1400 MHz, the averaged profile slightly shifted after the first and third abnormal events, implying a relationship between abnormal event and profile variation. We also found a linear trend in the left-edge position of the averaged profiles between the first and third events as well as after the third event, suggesting the existence of a slow-drifting mode between the two major events. The second event has a comparatively small shift in phase and is thus categorized as a “small flare state”. During the third event, a sequence of approximately nine pulses was seen to significantly weaken in all frequency bands, likely associated with the pseudo-nulling observed at 150 MHz. A three-component de-composition analysis of the normal averaged profiles shows that the trailing component is dominant at our observing frequencies, while the centre component has a comparatively steeper spectrum. We found the overall flux density in an abnormal event to slightly differ from that in an ordinary state, and the difference shows a frequency dependence. A comparison of the normal, abnormal and dimmed averaged profile indicates that the leading component is likely to be stable in all states.
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/38519
Collection中国科学院国家天文台
Affiliation1.中国科学院国家天文台
2.Max-Planck-Institut fur Radioastronomie
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Yu Yezhao,Peng Bo,Liu Kuo,et al. fastultrawidebandobservationofabnormalemissionshifteventsofpsrb091906[J]. sciencechinaphysicsmechanicsastronomy,2019,62(5).
APA Yu Yezhao.,Peng Bo.,Liu Kuo.,Zhang Chengmin.,Wang Lin.,...&Yu Meng.(2019).fastultrawidebandobservationofabnormalemissionshifteventsofpsrb091906.sciencechinaphysicsmechanicsastronomy,62(5).
MLA Yu Yezhao,et al."fastultrawidebandobservationofabnormalemissionshifteventsofpsrb091906".sciencechinaphysicsmechanicsastronomy 62.5(2019).
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