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November 2022
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 »December 2022
Simon Coudé (Harvard)
Dr. Simon Coudé (Harvard) Title: Revealing the dynamics of star-forming regions with far-infrared polarization Abstract: The polarization signature from dust thermal emission in the far-infrared is a powerful tool to study the physical properties of star-forming environments, and specifically to reveal the role of magnetic fields in slowing the gravitational collapse of interstellar filaments. With its multi-wavelength polarimetric capabilities, the High-resolution Airborne Wideband Camera Plus (HAWC+) aboard the Stratospheric Observatory for Infrared Astronomy (SOFIA) therefore opened a unique window into…
Find out more »January 2023
Seminar by Huirong Yan (Potsdam/DESY)
Title: Measurement of turbulent magnetic field from space to the interstellar medium Abstract: Turbulent magnetic field is ubiquitous in the Universe. In this talk, I shall report our results on detection of turbulent magnetic field from space to the interstellar medium (ISM). Clear signatures of critically balanced turbulence as well as compressible turbulence are revealed from space plasma from our analysis of the data from both Parker Space Probe and multi-spacescraft (MMS). Furthermore, recent progress on tracing magnetic field with atomic…
Find out more »February 2023
Seminar by Nguyễn Hạnh Chi (Caltech)
Title: The Cosmic Infrared Background ExpeRiment 2 (CIBER-2): A Near-Infrared Sounding Rocket Payload to Study Large-Scale Structure Formation Abstract: The emission from outside of the Milky Way, also known as the extragalactic background light (EBL), traces star formation back to the Epoch of Reionization (EOR) and provides important constraints to cosmological models. Near-infrared data from Spitzer and the sounding rocket experiment CIBER-1 suggest that the observed EBL fluctuates more than predicted by galaxy models. Multiple sources have been proposed to…
Find out more »March 2023
Seminar by Silvia Zhang (Caltech), on Wed, 22/3, from 9 am (Ha Noi time)
Speaker: Silvia Zhang (Caltech, USA) Title: Development and Deployment of the BICEP Array BA2 150 GHz receiver Abstract: The BICEP/Keck Collaboration is currently leading the quest to the highest sensitivity measurements of the polarized CMB with a series of cryogenic telescopes, of which BICEP Array is the latest Stage-3 upgrade with a total of 30k+ detectors. The instrument is comprised of 4 receivers at different frequencies spanning 30 to 270 GHz, with the low-frequency 30/40 GHz one already deployed to…
Find out more »August 2023
How do dense cores form in molecular clouds? (Fumitaka Nakamura, NAOJ, Japan)
Stars form from dense cores in molecular clouds. Therefore, it is crucial to understand how the cores form in molecular clouds. We recently analyzed the Herschel data of nearby molecular clouds, focusing on the core mass and separation, and we found that they are smaller than the values expected from Jeans fragmentation and filament fragmentation. We suggest that turbulent fragmentation may be the primary process to form cores.
Find out more »December 2023
Our ongoing projects and one suggestion of research on stellar flares (Daisaku NOGAMI, Tokyo University)
Since our detection of stellar superflares by Maehara et al. (2012), we have conducted statistical research using public data and observational studies by various methods. I will introduce our recent results and ongoing projects and suggest one project which may be carried out in Vietnam (231219SAGI-Nogami)
Find out more »February 2024
SPHEREx: An All-Sky Spectral Survey
Speaker: Cukierman Ariel (Caltech) Host: Nguyen Trong Hien (NASA) I will present SPHEREx, a NASA mission to map the entire sky with near-infrared spectroscopy. With a targeted launch date in early 2025, SPHEREx has broad scientific reach including 1) cosmic inflation through the three-dimensional distribution of galaxies, 2) the formation of galaxies and the history of light production through deep maps of large-scale clustering, and 3) the origin of water in planetary systems by mapping ice absorption in the Milky…
Find out more »March 2024
Integral Field Spectroscopy in lensing cluster fields – recent results and prospects of the BlueMUSE instrument
Speaker: Johan Richard (Lyon University) Host: Dr. Pham Tuan Anh (VNSC) Time: 2 PM (Vietnam time, UTC+7) The advent of panoramic integral field spectrographs, such as the MUSE (Multi Unit Spectroscopic Explorer) instrument on the Very Large Telescope, has offered the new capability to obtain efficient and massive spectroscopy in very crowded fields. When combined with massive clusters serving as gravitational telescopes, it has truly improved the modelling of cluster mass distribution and extended our view of distant background galaxies.…
Find out more »April 2024
The role of hub-filament systems in the formation of star-clusters with low- to high-mass stars
Speaker: Dr. Doris Arzoumanian (NAOJ), Host: Dr. Pham Ngoc Diep (VNSC) Abstract: Observations reveal the organization of the interstellar medium into filament networks. In molecular clouds, the densest filaments are identified as the precise birthplaces of solar-mass stars, while high-mass stars form in the hubs where the filaments merge. To understand the formation process of star-clusters, it is thus essential to describe the formation and evolution of filaments and hubs and their fragmentation into pre-stellar cores, the progenitor of stars.…
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