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Galactic Interstellar Scintillation Observed from Four Globular Cluster Pulsars by FAST

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Title: Galactic Interstellar Scintillation Observed from Four Globular Cluster Pulsars by FAST
Authors: Zhang, Dandan, Tao, Zhenzhao, Yuan, Mao, Yao, Jumei, Wang, Pei, Zhi, Qijun, Zhu, Weiwei, Shi, Xun, Kramer, Michael, Li, Di, Zhang, Lei, Li, Guangxing
Source: SCIENCE CHINA Physics, Mechanics & Astronomy , Volume 66, Issue 9: 299511 (2023)
Publication Year: 2023
Collection: Astrophysics
Subject Terms: Astrophysics - Astrophysics of Galaxies, Astrophysics - High Energy Astrophysical Phenomena
More Details: We report detections of scintillation arcs for pulsars in globular clusters M5, M13 and M15 for the first time using the Five-hundred-meter Aperture Spherical radio Telescope (FAST). From observations of these arcs at multiple epochs, we infer that screen-like scattering medium exists at distances $4.1_{-0.3}^{+0.2}$ kpc, $6.7_{-0.2}^{+0.2}$ kpc and $1.3_{-1.0}^{+0.7}$ kpc from Earth in the directions of M5, M13 and M15, respectively. This means M5's and M13's scattering screens are located at $3.0_{-0.2}^{+0.1}$ kpc and $4.4_{-0.1}^{+0.1}$ kpc above the galactic plane, whereas, M15's is at $0.6_{-0.5}^{+0.3}$ kpc below the plane. We estimate the scintillation timescale and decorrelation bandwidth for each pulsar at each epoch using the one-dimensional auto-correlation in frequency and time of the dynamic spectra. We found that the boundary of the Local Bubble may have caused the scattering of M15, and detected the most distant off-plane scattering screens to date through pulsar scintillation, which provides evidence for understanding the medium circulation in the Milky Way.
Comment: 9 pages, 3 figures, matches the published version
Document Type: Working Paper
DOI: 10.1007/s11433-023-2138-5
Access URL: http://arxiv.org/abs/2308.05989
Accession Number: edsarx.2308.05989
Database: arXiv
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  Data: Galactic Interstellar Scintillation Observed from Four Globular Cluster Pulsars by FAST
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  Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Dandan%22">Zhang, Dandan</searchLink><br /><searchLink fieldCode="AR" term="%22Tao%2C+Zhenzhao%22">Tao, Zhenzhao</searchLink><br /><searchLink fieldCode="AR" term="%22Yuan%2C+Mao%22">Yuan, Mao</searchLink><br /><searchLink fieldCode="AR" term="%22Yao%2C+Jumei%22">Yao, Jumei</searchLink><br /><searchLink fieldCode="AR" term="%22Wang%2C+Pei%22">Wang, Pei</searchLink><br /><searchLink fieldCode="AR" term="%22Zhi%2C+Qijun%22">Zhi, Qijun</searchLink><br /><searchLink fieldCode="AR" term="%22Zhu%2C+Weiwei%22">Zhu, Weiwei</searchLink><br /><searchLink fieldCode="AR" term="%22Shi%2C+Xun%22">Shi, Xun</searchLink><br /><searchLink fieldCode="AR" term="%22Kramer%2C+Michael%22">Kramer, Michael</searchLink><br /><searchLink fieldCode="AR" term="%22Li%2C+Di%22">Li, Di</searchLink><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Lei%22">Zhang, Lei</searchLink><br /><searchLink fieldCode="AR" term="%22Li%2C+Guangxing%22">Li, Guangxing</searchLink>
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  Data: SCIENCE CHINA Physics, Mechanics & Astronomy , Volume 66, Issue 9: 299511 (2023)
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  Data: We report detections of scintillation arcs for pulsars in globular clusters M5, M13 and M15 for the first time using the Five-hundred-meter Aperture Spherical radio Telescope (FAST). From observations of these arcs at multiple epochs, we infer that screen-like scattering medium exists at distances $4.1_{-0.3}^{+0.2}$ kpc, $6.7_{-0.2}^{+0.2}$ kpc and $1.3_{-1.0}^{+0.7}$ kpc from Earth in the directions of M5, M13 and M15, respectively. This means M5's and M13's scattering screens are located at $3.0_{-0.2}^{+0.1}$ kpc and $4.4_{-0.1}^{+0.1}$ kpc above the galactic plane, whereas, M15's is at $0.6_{-0.5}^{+0.3}$ kpc below the plane. We estimate the scintillation timescale and decorrelation bandwidth for each pulsar at each epoch using the one-dimensional auto-correlation in frequency and time of the dynamic spectra. We found that the boundary of the Local Bubble may have caused the scattering of M15, and detected the most distant off-plane scattering screens to date through pulsar scintillation, which provides evidence for understanding the medium circulation in the Milky Way.<br />Comment: 9 pages, 3 figures, matches the published version
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      – SubjectFull: Astrophysics - High Energy Astrophysical Phenomena
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