IPS Observations in China: Past, Now and Future Lijia Liu National Astronomical Observatories,...
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![Page 1: IPS Observations in China: Past, Now and Future Lijia Liu National Astronomical Observatories, Chinese Academy of Sciences (NAOC) (Given by Mario M. Bisi,](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697bf9d1a28abf838c94047/html5/thumbnails/1.jpg)
IPS Observations in China:Past, Now and Future
Lijia Liu
National Astronomical Observatories, Chinese Academy of Sciences (NAOC)
(Given by Mario M. Bisi, STFC RAL Space)
![Page 2: IPS Observations in China: Past, Now and Future Lijia Liu National Astronomical Observatories, Chinese Academy of Sciences (NAOC) (Given by Mario M. Bisi,](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697bf9d1a28abf838c94047/html5/thumbnails/2.jpg)
Outline
1. IPS study in China
2.Future development of IPS in China
![Page 3: IPS Observations in China: Past, Now and Future Lijia Liu National Astronomical Observatories, Chinese Academy of Sciences (NAOC) (Given by Mario M. Bisi,](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697bf9d1a28abf838c94047/html5/thumbnails/3.jpg)
IPS study in China
China began IPS study in the1990s
• IPS theory study: Y. H. Qiu, X. Z. Zhang, P. Z. Ye et al.
• IPS observation: NAOC (BAO)
![Page 4: IPS Observations in China: Past, Now and Future Lijia Liu National Astronomical Observatories, Chinese Academy of Sciences (NAOC) (Given by Mario M. Bisi,](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697bf9d1a28abf838c94047/html5/thumbnails/4.jpg)
IPS with MSRT
• Since 1990s• 9m, 28 telescopes• Frequency: 232MHz• Additive mode• Equivalent aperture
47m
X. Z. Zhang et al., Chinese Science bulletin Vol. 6, 2001
MSRT : Miyun Synthesis Radio Telescope
![Page 5: IPS Observations in China: Past, Now and Future Lijia Liu National Astronomical Observatories, Chinese Academy of Sciences (NAOC) (Given by Mario M. Bisi,](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697bf9d1a28abf838c94047/html5/thumbnails/5.jpg)
IPS with MSRT
X. Z. Zhang et al., Chinese Science bulletin Vol. 6, 2001
![Page 6: IPS Observations in China: Past, Now and Future Lijia Liu National Astronomical Observatories, Chinese Academy of Sciences (NAOC) (Given by Mario M. Bisi,](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697bf9d1a28abf838c94047/html5/thumbnails/6.jpg)
X. Z. Zhang et al., Chinese Science bulletin Vol. 6, 2001
2000-4-12 3C48 raw data (a) and power spectrum (b)
Raw data Power spectrum
IPS with MSRT
![Page 7: IPS Observations in China: Past, Now and Future Lijia Liu National Astronomical Observatories, Chinese Academy of Sciences (NAOC) (Given by Mario M. Bisi,](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697bf9d1a28abf838c94047/html5/thumbnails/7.jpg)
The Retirement of MSRT
• The degradation of radio environment in Miyun Station
• The construction of a new radio telescope
MSRT was retired early this century IPS observation was ceased for several years
![Page 8: IPS Observations in China: Past, Now and Future Lijia Liu National Astronomical Observatories, Chinese Academy of Sciences (NAOC) (Given by Mario M. Bisi,](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697bf9d1a28abf838c94047/html5/thumbnails/8.jpg)
IPS with 25 m in Urumqi
• First SSSF IPS observing station in China
• Diameter : 25m
• Wavelength: 18cm
• Sampling interval: 0.25ms
• Integration interval: 10ms
![Page 9: IPS Observations in China: Past, Now and Future Lijia Liu National Astronomical Observatories, Chinese Academy of Sciences (NAOC) (Given by Mario M. Bisi,](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697bf9d1a28abf838c94047/html5/thumbnails/9.jpg)
IPS with 25 m in Urumqi
Key Parameters of IPS Observations with the 25m Radio Telescope Performed in 2008 at UAO
L. J. Liu et al,,RAA,2010,10,6,577-586
![Page 10: IPS Observations in China: Past, Now and Future Lijia Liu National Astronomical Observatories, Chinese Academy of Sciences (NAOC) (Given by Mario M. Bisi,](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697bf9d1a28abf838c94047/html5/thumbnails/10.jpg)
IPS with 25 m in Urumqi
Characteristic spectrum of the 18 cm receiver at UAO before and after filtering.
L. J. Liu et al,,RAA,2010,10,6,577-586
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Flow chart for data processing
Flow chart for data acquisition
IPS with 25 m in Urumqi
![Page 12: IPS Observations in China: Past, Now and Future Lijia Liu National Astronomical Observatories, Chinese Academy of Sciences (NAOC) (Given by Mario M. Bisi,](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697bf9d1a28abf838c94047/html5/thumbnails/12.jpg)
Date: 2008.12.1
Parameters : AR=1.2 , α=3.1 , V=400km/s
Fitting spectrum
3C3457.1Jy0.23AU
L. J. Liu et al,,RAA,2010,10,6,577-586
IPS with 25 m in Urumqi
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IPS with 50m in Miyun
• Observing frequencies(MHz)
UHF( 327/611)
S/X(2300 , 8400)
• The only SSDF IPS observing station in China• Serving the Chinese Meridian Project
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Technical Data of the Telescope
X. Y. Zhu et al, RAA,2012,12,8, 857-864
IPS with 50m in Miyun
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IPS with 50m in Miyun
Front-end of IPS observation system.
X. Y. Zhu et al, RAA,2012,12,8, 857-864
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Data acquisition system
IPS with 50m in Miyun
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IPS with 50m in Miyun
(a):IPS spectrum of observation data from 3c237b on September 27, 2011 ( Red line is the theoretical fitting curve).(b)Normalized Co-spectrum(NCS) between the pairs of radio frequencies 2300/8400 in MHz.Scales are logarithmic for frequency and power density (2dB per division) and linear for NCS.
X. Y. Zhu et al, RAA,2012,12,8, 857-864
![Page 18: IPS Observations in China: Past, Now and Future Lijia Liu National Astronomical Observatories, Chinese Academy of Sciences (NAOC) (Given by Mario M. Bisi,](https://reader035.fdocuments.in/reader035/viewer/2022062305/5697bf9d1a28abf838c94047/html5/thumbnails/18.jpg)
1. IPS study in China
2.Future development of IPS in China
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Future development of IPS in China
• 25 m in XAOThe most efficient radio telescope in China,
hard to apply
• 50m in Miyun Under take the Lunar Project at the
meantime, IPS observation can only be a part time job
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Future development of IPS in ChinaIPS group in JLRAT, NAOC
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Future development of IPS in China
• Build special IPS telescope• Research new low frequency
receivers• Development of digital back-end• Perfecting data processing method• Strengthening international
cooperation
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Thank you!