A NEW HARDWARE CORRELATOR IN KOREA: PERFORMANCE EVALUATION USING KVN OBSERVATIONS

	A NEW HARDWARE CORRELATOR IN KOREA: PERFORMANCE EVALUATION USING KVN OBSERVATIONS
	Lee, Sang-Sung 1,2; Oh, Chung Sik 1; Roh, Duk-Gyoo 1; Oh, Se-Jin 1; Kim, Jongsoo 1,2; Yeom, Jae-Hwan 1; Kim, Ho Ryoung 1; Jung, Dong-Gyu 1; Byun, Do-Young 1; Jung, Taehyun 1,2
刊名	JOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY
	2015-04-30
卷号	48 期号:2 页码:125-137
关键词	Techniques: interferometric Instrumentation: interferometers Radio continuum: galaxies Masers
英文摘要	We report results of the performance evaluation of a new hardware correlator in Korea, the Daejeon correlator, developed by the Korea Astronomy and Space Science Institute (KASI) and the National Astronomical Observatory of Japan (NAOJ). We conduct Very Long Baseline Interferometry (VLBI) observations at 22 GHz with the Korean VLBI Network (KVN) in Korea and the VLBI Exploration of Radio Astrometry (VERA) in Japan, and correlated the aquired data with the Daejeon correlator. For evaluating the performance of the new hardware correlator, we compare the correlation outputs from the Daejeon correlator for KVN observations with those from a software correlator, the Distributed FX (DiFX). We investigate the correlated flux densities and brightness distributions of extragalactic compact radio sources. The comparison of the two correlator outputs shows that they are consistent with each other within < 8%, which is comparable with the amplitude calibration uncertainties of KVN observations at 22 GHz. We also find that the 8% difference in flux density is caused mainly by (a) the difference in the way of fringe phase tracking between the DiFX software correlator and the Daejeon hardware correlator, and (b) an unusual pattern (a double-layer pattern) of the amplitude correlation output from the Daejeon correlator. The visibility amplitude loss by the double-layer pattern is as small as 3%. We conclude that the new hardware correlator produces reasonable correlation outputs for continuum observations, which are consistent with the outputs from the DiFX software correlator.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	RADIO INTERFEROMETRY ; LINE INTERFEROMETRY ; TAPE-RECORDER ; EARLY SCIENCE ; VLBI NETWORK ; SPACE VLBI ; 43 GHZ ; SYSTEM ; TELESCOPES
收录类别	SCI
语种	英语
WOS记录号	WOS:000354419900004
公开日期	2015-08-18
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18270]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Korea Astron & Space Sci Inst, Taejon 305348, South Korea 2.Korea Univ Sci & Technol, Taejon 305350, South Korea 3.Chinese Acad Sci, Shanghai Observ, Shanghai 200030, Peoples R China 4.Natl Astron Observ Japan, Mizusawa VLBI Observ, Mitaka, Tokyo 1818588, Japan
推荐引用方式 GB/T 7714	Lee, Sang-Sung,Oh, Chung Sik,Roh, Duk-Gyoo,et al. A NEW HARDWARE CORRELATOR IN KOREA: PERFORMANCE EVALUATION USING KVN OBSERVATIONS[J]. JOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY,2015,48(2):125-137.
APA	Lee, Sang-Sung.,Oh, Chung Sik.,Roh, Duk-Gyoo.,Oh, Se-Jin.,Kim, Jongsoo.,...&Wajima, Kiyoaki.(2015).A NEW HARDWARE CORRELATOR IN KOREA: PERFORMANCE EVALUATION USING KVN OBSERVATIONS.JOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY,48(2),125-137.
MLA	Lee, Sang-Sung,et al."A NEW HARDWARE CORRELATOR IN KOREA: PERFORMANCE EVALUATION USING KVN OBSERVATIONS".JOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY 48.2(2015):125-137.