Home > ALMA Jセミナー | Solar and Space Plasma (SSP) Seminar > 2021.8.23-2021.8.29


Aug 25 Wed 15:00~16:00  ALMA-J seminar           zoom

Aug 27 Wed 10:30~12:00  Solar and Space Plasma Seminar    zoom 



Campus: Mitaka
Seminar: ALMA-J seminar
Regularly Scheduled/Sporadic: Every Wednesday Date and Time: 2021 August 25 15:00-16:00
Place: Zoom
Speaker:Hiddo Algera (Leiden University)
Title: Distant star formation in the faint radio sky
Abstract: Radio emission constitutes a powerful tracer of star formation in distant galaxies. At GHz frequencies, this is due to the tight correlation that exists between radio synchrotron and infrared luminosities, which calibrates radio emission as a star-formation rate indicator. However, the nature and origin of this infrared/radio correlation (IRRC) remains nebulous to this day. I will present recent work on the IRRC for ~700 ALMA-detected submillimeter galaxies, and discuss its relation to the physical conditions in these starbursting systems.

At higher radio frequencies (> 30 GHz), a different tracer of star formation emerges: radio free-free emission (FFE). FFE is known to be one of the most reliable probes of star formation in the local Universe, but due to its faintness it remains elusive at early cosmic times. We recently explored the power of FFE at high redshift using sensitive multi-frequency VLA observations, including deep radio continuum data at 34 GHz. I will highlight key results from this work, and additionally present the first constraints on the cosmic star-formation rate density from radio free-free emission.

Facilitator: Yoshito Shimajiri, Shun Ishii


Campus: Mitaka
Seminar: Solar and Space Plasma Seminar
Regularly Scheduled/Sporadic: Scheduled
Date and time:27 August (Fri), 10:30-12:00
Place: zoom
Speaker:Satoshi Inoue
Affiliation: New Jersey Institute of Technology

Title: Past and Future of Data-Based MHD Simulation of Solar Eruptions
Three-dimensional (3D) magnetohydrodynamic (MHD) simulation is a powerful tool to understand 3D dynamics of the coronal magnetic fields and plasmas in solar eruptions. Since the mid 2000s, recent solar satellites, such as Hinode and Solar Dynamics Observatory have provided high resolution photospheric magnetic field data, both in space and time. These data have given us an opportunity to conduct data-constrained and -driven MHD simulations of solar eruptions that brought lots of new insights. In this talk, first I will review our works on data-constrained and -driven MHD simulations and mention the remaining issues that will be addressed in the next few years. Second, I will further discuss the nonlinear force-free field and non-force-free field (magnetohydrostatic field) extrapolations that will be developed in next 1-2 years to apply the high-resolved photospheric data obtained with Goode Solar Telescope of the Big Bear Solar Observatory and Daniel K. Inouye Solar Telescope.

-Name:Yusuke Kawabata
Comment:in English,

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