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 == Commissioning of 8 Gbps recording == == Commissioning of 8 Gbps recording ==
  
-The 8 Gbps recording mode has been commissioned for multi-wavelength observations with a total bandwidth of 2 GHz (or with a bandwidth of 512MHz for each frequency band).+The 8 Gbps recording mode has been commissioned for multi-wavelength observations with a total bandwidth of 2 GHz (or with a bandwidth of 512MHz for each frequency band). The correlated flux densities of the 8 Gbps mode observations for 3C273 are higher, compared with the 1 Gbps mode observations by 
10% (K), 
12% (Q),
 9% (W),
 12% (D). 
 + 
 + 
 +{{ :​image8gbps.png?​300 |Images from the 8Gbps mode observations for 3C 273 at K-band (upper left), Q-band (upper right), W-band (lower left), and D-band (lower rifht). Peak flux density (denoted as p), rms (as r), and dynamic range (as DR) are given in the images. ​ }} 
 +Figure caption: Images of the 8Gbps mode observations for 3C 273 at K-band (upper left), Q-band (upper right), W-band (lower left), and D-band (lower rifht). Peak flux density (denoted as p), rms (as r), and dynamic range (as DR) are given in the images. 
 + 
 +{{ :​spectrum8gbps.png?​500 |Spectra of the 8Gbps mode observations before(left) and after(right) a Bandpass calibration (BPASS) being applied.}} 
 +Figure caption: Spectra of the 8Gbps mode observations before(left) and after(right) a Bandpass calibration (BPASS) being applied.
  
 == Data reduction Pipeline developed == == Data reduction Pipeline developed ==
  
-The KVN Pipeline has been developed including an application of the Frequency Phase Transfer (FPT) technique (see http://​radiowiki.kasi.re.kr/​radiowiki/​doku.php?​id=pipeline). ​+The KVN Pipeline has been developed including an application of the Frequency Phase Transfer (FPT) technique(see [[http://​adsabs.harvard.edu/​abs/​2016JKAS...49..137H|Hodgson et al. 2016, JKAS, 49, 137]] and also see its [[http://​radiowiki.kasi.re.kr/​radiowiki/​doku.php?​id=pipeline|wiki page]]). We find that the pipelined data using phase transfer produces better results than a manually reduced dataset 
 +not using the phase transfer. Additionally we compared the pipeline results with a manually reduced 
 +phase-transferred dataset and found the results to be identical
    
  
 == First simultaneous K/Q-band fringes obtained with VERA == == First simultaneous K/Q-band fringes obtained with VERA ==
  
-First simultaneous fringes at K/Q-band between KVN and VERA were obtained, using the K/Q-band quasi-optics system installed at VERA stations. ​  ​+First simultaneous fringes at K/Q-band between KVN and VERA were obtained, using the K/Q-band quasi-optics system installed at VERA stations. ​ 
 +  ​
  
 == VLBI images obtained with KVN and the Sejong 22-m radio telescope == == VLBI images obtained with KVN and the Sejong 22-m radio telescope ==
  
 The Sejong 22-m diameter radio telescope is located in Sejong, Korea. VLBI observations together with KVN and the Sejong 22-m radio telescope were conducted, yielding VLBI images of several bright compact extragalactic radio sources. The Sejong 22-m diameter radio telescope is located in Sejong, Korea. VLBI observations together with KVN and the Sejong 22-m radio telescope were conducted, yielding VLBI images of several bright compact extragalactic radio sources.
 +
 +{{ :​m87-k.png?​500 |M87 Images from the KVN and Sejong 22-m radio telescopes at 22GHz band. (Left) The image only with KVN. (Right) The image with KVN and Sejong. Peak flux density (denoted as P), rms (as rms), and dynamic range (as DR) are given on top of the images. ​ }}
 +Figure caption: M87 Images from the KVN and Sejong 22-m radio telescopes at 22GHz band. (Left) The image only with KVN. (Right) The image with KVN and Sejong. Peak flux density (denoted as P), rms (as rms), and dynamic range (as DR) are given on top of the images.
  
 == KVN joined the GMVA in Oct 2015 == == KVN joined the GMVA in Oct 2015 ==
start.1496065972.txt.gz · Last modified: 2019/04/11 10:23 (external edit)