Korean VLBI Network

Korean VLBI Network
The telescope in Yonsei
Location(s)
Coordinates 37°33′44″N 126°56′35″E / 37.5622°N 126.9431°E / 37.5622; 126.9431Coordinates: 37°33′44″N 126°56′35″E / 37.5622°N 126.9431°E / 37.5622; 126.9431 Edit this at Wikidata
Organization Korea Astronomy and Space Science Institute Edit this on Wikidata
Wavelength 2 mm (150 GHz)-14 mm (21 GHz)
Built 2001 Edit this on Wikidata–2008 Edit this on Wikidata (2001 Edit this on Wikidata–2008 Edit this on Wikidata) Edit this at Wikidata
Telescope style radio interferometer Edit this on Wikidata
Number of telescopes 3 Edit this on Wikidata
Diameter 21 m (68 ft 11 in) Edit this at Wikidata
Angular resolution 5 milliarcsecond, 1 milliarcsecond Edit this on Wikidata
Website kvn-web.kasi.re.kr/en/en_normal_info.php,%20http://kvn-web.kasi.re.kr Edit this at Wikidata
Location of Korean VLBI Network

The Korean VLBI Network (KVN) is a radio astronomy observatory located in South Korea. It comprises three 21-meter radio telescopes that function as an interferometer, using the technique of very-long-baseline interferometry (VLBI).

Characteristics

The KVN has three main dishes, each of 21m diameter and at respective separations of 300–500 km. All three dishes are located on university campus. Two are on the Korean peninsula: Yonsei University (KY) and Ulsan University (KU), and the third is located on Jeju Island on the campus of Jeju International University (formerly Tamna University; KT). The KVN antennas are Cassegrain-types with alt-az mounts. Each telescope has a 21-m diameter main reflector with a focal length of 6.78 m. The main reflectors consist of 200 aluminum panels each with a manufacturing surface accuracy of 65 microns.[1]

A fourth telescope, the existing 14m dish located at the Taeduk Radio Astronomy Observatory, will be linked to the KVN in the future via optical fiber networks.[2]

KVN focuses on millimeter-wavelength VLBI, and is designed to make simultaneous measurements at four different observing frequencies: 22, 43, 86, and 129 GHz. The telescopes can operate together with VLBI networks in Japan and China the East Asian VLBI Network (EAVN). The EAVN consists of 19 antennae with a maximum baseline of 5000 km operating at 22 GHz; it can also operate at 43 GHz using only 9 antennae. The first fringes for EAVN at 22 GHz were successfully detected in 2009.[3]

The KVN has also successfully been used for real-time VLBI between Korea and Europe.[4]

Key science

KVN studies the formation and death processes of stars, the structure and dynamics of the Milky Way, the nature of active galactic nuclei, and other astronomical topics. KVN is also used for geodesy in detecting tectonic movements in the Korean peninsula.

Visiting

The visitor's center for KVN is located at the Advanced Science & Technology Center on the campus of Yonsei University in Seoul.

See also

References

  1. ↑ Lee, Sang-Sung (2011). "Single dish performance of KVN 21-m radio telescopes: Simultaneous observations at 22 and 43 GHz". Publications of the Astronomical Society of the Pacific. 123: 1398–1411. arXiv:1110.3881 [astro-ph.IM]. Bibcode:2011PASP..123.1398L. doi:10.1086/663326. Cite uses deprecated parameter |class= (help)
  2. ↑ http://kvn-web.kasi.re.kr/en/en_normal_info.php
  3. ↑ http://kvn.kasi.re.kr/index.html/. Retrieved 2015-11-11. Missing or empty |title= (help)
  4. ↑ http://www.kasi.re.kr/View.aspx?id=report&page=2&si=False&sn=False&ss=True&sc=False&keyword=&pagesize=20&uid=3645
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