M61 - Barred Spiral Galaxy - Deep Sky Videos
ฝัง
- เผยแพร่เมื่อ 8 ก.พ. 2025
- Professor Mike Merrifield discusses star formation in Messier 61 - also known as NGC 4303.
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Video by Brady Haran and James Hennessy
This series is also great for those like me (not astrophysicists) who do simple observations or astrophotography. It is amazing to learn more about the objects of this famous catalogue. Strange as it may seem, it is not easy to find qualitative information about them on the Internet. So, thank you so much for these videos!
If you like these, have a look at the "Annals of the deep sky" book series. Compared to say an observing guide it focusses a lot more on the how and why we observe or photograph the details/structures of these deep sky gems. It references a lot of scientific papers without going too deep in them (IMHO) - just like this video series. There's quite a bit of depth to it, the book series is currently at volume 8 with Cygnus/Dorado and they are going alphabetically - wouldn't surprise me if the final tally will end up somewhere around 24/25 volumes.
@Benny Colyn It seems great. I'll have a look at them. Thank you very much!
Molecular hydrogen doesnt form a dipole so it is not IR active. Carbon monoxide however does have a dipole so it is IR active. This is why hydrogen is hard to detect.
One of my favorite hard targets.
It's a bit small for amateur astronomy, but with a big enough telescope, it's a beauty.
Also, there are always lots of minor planets in M61 field, as a bonus.
Edging closer to cover the full catalogue. Four more, makes me wonder what will be beyond.
A video for everything in the NGC.
A different catalog.
This series, over the years, have been my favorite on YT.
Always Love Watching These Videos. Loved The session on M61. Beautiful Galaxy!
I think I will have to point my scope at this one this year :)
Great to see Mike back in his office!
What a rollercoaster. M61 is some hardcore astrophysicism (did I spell that correctly?)
I love this word! ❤
Thank you.
No one had ever explained to me that Galaxy "Bar's" are virtually empty of stars.
I like to think that M61 looks a lot like the Milky Way would if we could look at it from a similar vantage point.
I got a bit excited when I saw a Nelson Physics text I probably worked on on Professor Merrifield’s shelf.
excellent work
Excellent video -- but I couldn't stop looking at the "Atlas of Creation" book perched so precariously at the left end of the bookshelf behind Dr. Merrifield. I keep expecting it to topple off the shelf at any moment! Who knew an astronomy video would have so much dramatic tension!
If you search TH-cam for "Atlas of Creation", there's an extremely old video where prof. Merrifield explains why he has it.
Great bit of science here, lots of deductive reasoning going on!
Only 4 more to go, if my count is right.
This whole Messier-Series is amazing.
It's a shame that we can observe such beautiful objects throughout the universe but no matter how advanced mankind becomes we shall never be able to visit anything we can see, we're imprisoned on this rock and there's probably a good reason for this.
Fantastic images of the galaxy thanks for sharing 🤘🇦🇺🌌
Is there something very special that the JWT will look at first?
Thanks for the vlogs. 8)
If CO is so optically thick, aren't we kind of lucky that we can observe it in other galaxies at all? Meaning the gas around us is not dense enough to prevent us from even looking through it?
Why are the crabon graphs so blockie?...why didn't they look for more detail? 5:07
I'm not certain, but i think the resolution is lower with spectroscopy than in visible light.
These observations are made in microwaves, so you don't get as much resolution as you do with visible light, which has much shorter wavelength. If I'm not mistaken, the white circles you see in the bottom left corner of the color images represent the resolution of their telescope at those wavelengths. You can think of it as the size of the "paintbrush" they use to "paint" those images.
Not many Messier objects left. I think I counted 4.
Say, that guy asking questions sounds just like Brady
Nice shoutout to @unistellar at the end!
How many Messier are left now? We should be nearing the end!
I don't have much luck in bars either.
"... if you make a few assumptions..."
the key thing is, that those are educated assumptions...
If you want to be a star, stay away from the bar. Seems sensible.
"you'd have to talk to a chemist"
periodic videos crossover?
So to increase the probability of finding more intelligent life we should go to the bar. Did I get that right?
@2:08 "...just doesn't work so well within a bar"
CNN is reporting that it doesn't work so well within a bar, due to a dog whistle from President Trump, via orders from Putin.
He's speaking way too quickly