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Published: 2013-03-30
Abstract Views: 21
DOI: https://doi.org/10.53747/nst.v3i1.244
Issue
Vol. 3 No. 1 (2013)
Section
Articles
How to Cite
NGUYEN , V. H., VATLY team, & DAO , T. K. (2013). THE VATLY RADIO TELESCOPE. Nuclear Science and Technology, 3(1), 1-7. https://doi.org/10.53747/nst.v3i1.244

THE VATLY RADIO TELESCOPE

NGUYEN VAN HIEP1, VATLY team1, DAO TIEN KHOA1
1 Institute for Nuclear Science and Technology, VINATOM 179 Hoang Quoc Viet, Cau Giay, Ha Noi

Main Article Content

Abstract

A 2.6 m radio telescope, tuned on the 21 cm atomic hydrogen line, has been installed on the roof of the VATLY laboratory in Ha Noi. After a brief description of its performance, I report on measurements of the power density spectrum made over the visible part of the Milky Way disk. The data give strong evidence for differential rotation of the Galaxy with respect to the Sun and for an important clumping of molecular hydrogen in distinct clouds. The analysis of the measured Doppler spectra is used to map atomic hydrogen over the disk of the Galaxy. The result is compared with the arm structure observed at visible and infrared wavelengths.

Article Details

Keywords

radio astronomy, 21 cm hydrogen line, Milky Way, Sun

References

[1] Dan P. Clemens, “Massachusetts-Stony Brook Galactic plane CO survey - The Galactic disk rotation curve”, Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 295, Aug. 15, 1985, p. 422-428, 431-436.
[2] Lindblad, P. O., “The velocity distribution of atomic hydrogen in the outer parts of the galactic system according to the Kootwijk Survey 1953 – 55”, Bulletin of the Astronomical Institutes of the Netherlands Supplement, Vol. 1, p.77.
[3] Vallée, Jacques P., “Metastudy of the Spiral Structure of Our Home Galaxy”, The Astrophysical Journal, Volume 566, Issue 1, pp. 261-266.