Department of AstroPhysics (DAP)
Vietnam National Space Center, Vietnam Academy of Science and Technology
Address: 18 Hoang Quoc Viet, Nghia Do, Cau Giay, Hanoi, Vietnam
The aim of the Department of AstroPhysics (DAP) is to establish in Hanoi a team of researchers of international stature having the ambition to promote in the country teaching and research in fundamental sciences, and in particular in astrophysics. It is installed in the premises of the Vietnam National Space Center (VNSC), Vietnam Academy of Science and Technology (VAST) in Hanoi. It publishes a Newsletter and maintains a web site where useful information can be found: http://www.vnsc.org.vn/dap/Introduction.htm
Collaborations have been established with IRAP in Toulouse, LERMA in Paris and LAB in Bordeaux on the analysis of millimeter and sub-millimeter data.
The IRAP collaboration (Institut de Recherche en Astrophysique et Planétologie), with Professor Frederic Boone, uses data collected at the Plateau de Bure Interferometer Array on a remote (z=2.8) quasar gravitationally lensed by a galaxy in the foreground. Four images are detected in the continuum and on the red-shifted CO(7-6) line. Further studies will deal, in particular, with simulations and data related with ALMA, a large interferometer array recently constructed in Chile.
The LERMA collaboration (Laboratoire d’Étude du Rayonnement et de la Matière en Astrophysique), with Professor Thibaut Le Bertre, uses data collected at Nançay on CO (single dish) and at the Very Large Array on HI (interferometer) to observe the circumstellar shells of Red Giants on the Asymptotic Giant Branch, with particular emphasis on the study of the mass loss mechanism.
The LAB collaboration (Laboratoire d'Astrophysique de Bordeaux), with Drs Anne Dutrey and Stéphane Guilloteau, uses data collected by ALMA on continuum and CO lines to observe the protoplanetary discs of young low and intermediate mass stars (M < 5 Msun).
Research at home
The laboratory is equipped with a radio telescope meant to provide training of students and to make the research staff familiar with the tools and techniques used in the field of radio astronomy. A 600 MHz interferometer that has been used to study solar interferences has now been given to Hanoi University of Education for the training of their students.
The radio telescope, a 2.6 m dish tuned on the 21 cm HI line, was acquired in April 2011 and is now installed on the roof of the University of Science and Technology of Hanoi (USTH). After a period of running in, including measurements of the noise level and of pointing corrections, it is currently being used to map neutral hydrogen in the disk of the Milky Way and obtain information on its arm structure and on the rotation curve of the Galaxy. It was then used to study the Sun, the Moon and some other weak radio sources in the sky. The excellent performance of the instrument will allow for a rich program of observations.
We are also training undergraduate students who spend four to six months with us to work on their dissertation at the end of their university years. Recent studies include: Global warming and cosmic rays, A study of diffusive shock acceleration in young Supernova remnants, The three body problem and formation of X-ray active binaries by capture and Gravitational Lensing and Einstein Rings.
Pham Tuan Anh, Pham Ngoc Diep, Do Thi Hoai, Pham Thi Tuyet Nhung, Pierre Darriulat, Nguyen Thi Phuong, Tran Thi Thai and Nguyen Thi Thao