August 2022
Dr. Pham Ngoc Diep (VNSC)
Speaker: Assoc.Prof. Pham Ngoc Diep (Vietnam National Space Center) Title ALMA Dust Polarization toward Protostellar Cores and Disks Abstract: Recent advances in high-spatial-resolution polarimetric observations, in particular with ALMA, allow us to resolve the small-scale (~ 100 au) characteristics of dust polarization toward protostellar cores and disks. ALMA observations reveal the diverse properties of dust polarization with wavelengths and location, which suggests the presence of different polarization mechanisms in protostellar environments. In this talk, I will briefly review the…
Find out more »September 2022
Archana Soam (India Institute of Astrophysics)
Speaker: Prof. Archana Soam (India Institute of Astrophysics) Title: Threads & flows in the dusty universe: Importance of astronomical polarimetry and spectroscopy in probing star-forming regions Abstract: The role of magnetic fields (B-fields) and turbulence in star formation is still under debate, but considering the magnetized nature of molecular clouds, we expect B-fields to have a significant impact on this process. Observations of molecular clouds in different environments using different astronomical techniques helps in understanding the various important aspects…
Find out more »October 2022
Pham Tuan Anh (VNSC)
Speaker: Dr. Pham Tuan Anh (Viet Nam National Space Center) Venue: Online via Zoom Time: 2:00 pm - 3:00 pm, Oct 20th, 2022 Title: Study of high-redshift galaxies at Department of Astrophysics (DAP/VNSC) Abstract:The presentation covers research work done in the Department of Astrophysics of the Vietnam National Space Centre (DAP/VNSC) on high redshift galaxies in the early Universe. After a brief general introduction, including research interests and methods, in particular gravitational lensing, I will present radio interferometer studies using…
Find out more »November 2022
Brandon Hensley (Princeton)
Title: The Nature of Interstellar Dust: Insights from Polarimetry Abstract: What is interstellar dust made of? In this talk, I will argue against conventional models that posit dust grains come in separate silicate and carbonaceous varieties. Rather, I will use observations of polarized dust emission to argue that grains are a mix of both silicate and carbonaceous materials, as well as other materials like metallic iron and iron oxides. Tests of this hypothesis and implications for the lifecycle of dust…
Find out more »Yue Hu (UW-Madison)
Speaker: Yue Hu (UW-Madison) Title: Characterizing 3D Magnetic Fields in Star-Forming Regions Magnetic field, turbulence, and self-gravity are important in understanding star formation. However, 3D magnetic field orientation and strength were barely accessed. Based on our recent understanding of dust polarization and anisotropic MHD turbulence, I will present two novel methods, i.e., polarization fraction analysis and velocity gradient technique (VGT), in tracing the 3D magnetic field orientation. By combing with the Davis–Chandrasekhar-Fermi method, I will show that the 3D magnetic…
Find out more »| June –20/06: Dr. Le Ngoc Tram (MPIfR, Bonn, Germany) — — — |
July –21/07: Prof. Pierre Dariulat (VNSC, Hanoi, Vietnam) — — — |
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