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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

The staff includes Pr. Pierre Darriulat, Drs Pham Tuan Anh, Pham Ngoc Diep, Pham Thi Tuyet Nhung, Nguyen Thi Thao, a PhD student Do Thi Hoai and a master student Nguyen Thi Phuong. Research interests are radio astronomy. Much of it is made in collaboration with other institutes, using data collected by major research installations abroad. In particular most PhD theses are made under an agreement of joint supervision with prestigious foreign universities.

The laboratory is equipped with instruments that are used for training and for domestic research. We receive support from the VNSC/VAST (running expenses), from the Ministry of Science and Technology (following a budget request made through NAFOSTED) and from various organizations in the form of fellowships (Odon Vallet, World Laboratory, etc.) or of occasional support (French CNRS/LIA, host universities/joint supervision PhD theses, etc.)


Radio astronomy


Collaborations have been established with IRAP in Toulouse and with LERMA in Paris 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.


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 installed in April 2011 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. 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