Worked Exercise: How you estimate mass density of ionized nebula from its thermal bremsstrahlung

Описание: This Worked Example shows how we analytically can estimate the mass density of an astrophysical ionized nebula from radio observations of its thermal bremsstrahlung.

0:00 Introduction
4:20 Expression for tau=1
6:50 Homogeneous slab radiative transfer solution and connection to "knee" in observed thermal bremsstrahlung radio emission
15:05 Calculation of mass density in ionized astrophysical nebula
24:00 Comparison to densities in Universe, stellar atmosphere, air in our room

#astrophysics #physics #astronomy #education #nebula #orion

Parts are part of course: Radiation Processes in Astronomy
Lecturer: Prof. Dr. Jon Sundqvist
Programmes where I teach it: KU Leuven Bachelor Physics & Master Astronomy & Astrophysics, Hasselt University Bachelor Physics (as video course)

I record lectures live and do them on black-board in the hope that it will provide a more authentic feeling of the sort: "we're doing the actual work here and now". So like I keep telling students in the classroom: whenever you discover me doing some error let me know directly; for this channel this means make a comment on the videos. Then we can have a look at it, and thereby learn nicely from each other as we continue to develop our knowledge.

Link to "Radiative Transfer and Radiative Processes in Astrophysics: Extended Version" playlist:
   • Radiative Transfer and Radiative Processes...  

Please subscribe here if you want to stay posted on new videos:
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Here's my group's research home page:
https://fys.kuleuven.be/ster/research...

Playlist for SUPERSTARS-3D:
   • SUPERSTARS-3D  

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  / jon-sundqvist-910969272  

For original, raw course black-board class lectures; 2025 version. This one here is actually mostly from 2024 -- so you can check out if I actually learn something if you want. But it's questionable, since it's well known that a university teacher's evolution time-scale is approximately same as that of a star. Anyway, you can see for yourself here:
   • Radiation Processes in Astronomy  


Image Credit: Infrared image: NASA/Spitzer/JPL-Caltech
https://svs.gsfc.nasa.gov/30959/