Paul Sutton

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Magnetic fields on cosmological galaxy mergers

This is an interesting paper on Archive. Looking at how magnetic fields and galaxy mergers.

I have added links to the thread on the Fediverse, and provided a link to Science Forums for further discussion.

2301.13208 The impact of magnetic fields on cosmological galaxy mergers — II. Modified angular momentum transport and feedback

Tags

#Astronomy,#Cosmology,#Galaxy,#Merger,#Magnetism,#Physics,#Science


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Star formation : HST vs JWST

This was posted to Mastodon (where all the really cool people are btw). A short video by Swapna Krishna Author of A POCKET GUIDE TO STARGAZING.

This video compares images of a star forming region taking using both the HST and JWST, great illustration on how the image data differs when the same area is viewed using the JWST Infra red capabilities.

Video

Tags

#Galaxy,#Stars,#Formation,#SpaceTelescope,#HST,#JWST


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Active galaxies Review

So following on from the post on December 1st this is a quick review of the active galaxies lecture from the Space Telescope Science Institute.

This lecture, presented by Dr Mitchell Revalski, is really interesting, looking at how supermassive black holes, despite their small size compared to the galaxy they reside in.

Energy from these can push away surrounding gas, and heat this up which reduces star formation as gas needs to cool to form stars.

so scales are pretty huge:

First lets look at what a light year is

Citation : spaceplace.nasa.gov

For most space objects, we use light-years to describe their distance. A light-year is the distance light travels in one Earth year. One light-year is about 6 trillion miles (9 trillion km). That is a 6 with 12 zeros behind it! 

1 pc = 1 parsec = 3.26 light years

Supermassive black hole < 1pc

Bulge = 1 = 3 kpc (kilo parsec)

disk 30 kpc

circumgalactic area 50kpc

So even though these black holes are very small, they have a big influence on what surrounds them.

We know this is happening thanks to the research that led to the 2020 Nobel prize.

Well worth watching and the link is above.

Next lecture 19th Jan – The Darkest Secrets of the Universe Speaker: Raja Guhathakurta (UC Santa Cruz)

#astronomy,#science,#space,#telescope,#scsci,#talk, #solarsystem,#galaxy,#blackhole,#supermassive,#stars, #gravity,#light,#matter,#atoms,#emissions,#aabsorption, #spectrum,#gamma,#xray,#visible,#invisible,#parsec, #lightyear,#distance,#galactic,#bulge,#spacetelescope, #groundtelescope,#astronomers,#education,#public


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