KVNCS: 2. The Fringe Survey of New Candidates for VLBI Calibrators in the K Band
(주)코리아스칼라
- 최초 등록일
- 2023.08.14
- 최종 저작일
- 2023.07
- 10페이지/ 어도비 PDF
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서지정보
ㆍ발행기관 : 한국천문학회
ㆍ수록지정보 : 천문학회지 / 56권 / 2호
ㆍ저자명 : Jeong Ae Lee, Taehyun Jung, Bong Won Sohn, Do-Young Byun
목차
Abstract
1. Introduction
2. Source Selection and Observation
3. Data Analysis
4. Results and Discussion
4.1. Fringe Detection
4.2. Spatial Distribution
4.3. Flux-Flux Relationship
5. Summary
Acknowledgments
References
영어 초록
The main goal of the Korean VLBI Network Calibrator Survey (KVNCS) is to expand the VLBI calibrators catalog for KVN, KaVA(KVN and VERA Array), EAVN(East-Asian VLBINetwork), and other extended regions. The secondKVNCS (KVNCS2) aimed to detect VLBI fringes of new candidates for calibrators in the K band. Out of the 1533 sources whose single-dish flux density in the K band was measured with KVN telescopes (Lee et al. 2017), 556 sources were observed with KVN in the K band. KVNCS2 confirmed the detection of VLBI fringes of 424 calibrator candidates over a single baseline. All detected sources had a high Signal-to-Noise Ratio (SNR) of >25. Finally, KVNCS2 confirmed 347 new candidates as VLBI calibrators in the K band, resulting in a 5% increase in the sky coverage compared to previous studies. The spatial distribution was quasi-uniform across the observable region (Dec. > −32.5◦). In addition, the possibility as calibrator candidates for the detected sources was checked, using an analysis of the flux-flux relationship. Ultimately, the KVNCS catalog will not only become the VLBI calibrator list but is also useful as a database of compact radio sources for astronomical studies.
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