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Tim Davis

@timdavisastro.bsky.social

Extragalactic Astronomer and Reader at Cardiff University (he/him). πŸ‡¬πŸ‡§πŸ‡±πŸ‡ΊπŸ‡ͺπŸ‡Ί

211 Followers  |  146 Following  |  10 Posts  |  Joined: 21.07.2023  |  1.6777

Latest posts by timdavisastro.bsky.social on Bluesky

Preview
Letter to Secretary of State re EDI in science Online survey BOS

βœ‰οΈ Some science πŸ§ͺ buddies and I have written an open letter to the UK government, strongly opposing their β€œkicking woke ideology out of science” sentiments, which stand to damage the UK’s scientific standing and ability to deliver for public good.

Please read and consider signing ✍🏻

t.co/H7rNzb0wGh

06.10.2023 12:05 β€” πŸ‘ 413    πŸ” 296    πŸ’¬ 43    πŸ“Œ 53
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Post-landing image from Chandrayaan-3, from the official ISRO birdsite account.

23.08.2023 16:08 β€” πŸ‘ 38    πŸ” 10    πŸ’¬ 0    πŸ“Œ 2

You can catch me live on TalkTV in ~15 minutes providing some live comment on the landing attempt by Chandrayaan-3.

23.08.2023 12:14 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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πŸ”­ Are you on the postdoc job market? Interested in star formation in nearby galaxies with JWST? Apply for this postdoc with my wonderful colleague Dr Ana Duarte Cabral! Deadline 15th Sept. Two years (+possibility of extension) https://tinyurl.com/2vyaryxa

21.08.2023 09:57 β€” πŸ‘ 15    πŸ” 6    πŸ’¬ 0    πŸ“Œ 0
a large, spiral galaxy in the centre of the image, with wispy and diffuse nebulosity surrounding it and trailing off to the lower right. In the background are many stars of different colours, and a narrow cigar-shaped galaxy in the distance.

a large, spiral galaxy in the centre of the image, with wispy and diffuse nebulosity surrounding it and trailing off to the lower right. In the background are many stars of different colours, and a narrow cigar-shaped galaxy in the distance.

Wow! 16 pro-amateur astrophotographers imaged the Whirlpool Galaxy, then combined their data to produce an image with 255 hours integration time. This is the result. πŸ§ͺπŸ”­

Credits and results in here: https://www.astrobin.com/7hwtz0/?fbclid=IwAR1pAzvCnwViMAZebbwJ0ypUHmzZ9YFLWNyM_ZMT8Id1W_nRcix5A7ajLRg

09.08.2023 22:59 β€” πŸ‘ 133    πŸ” 45    πŸ’¬ 12    πŸ“Œ 8

I was wondering the same. I dont see any emoji options when looking on my mac...

10.08.2023 11:02 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Post image A graph showing the mm-luminosities and X-ray luminosities of our sample galaxies, with the results of classical torus models and ADAF models overplotted. The torus models underpredict the mm luminosity of our sources by >2 orders of magnitude, while the ADAF grid explains them much better

A graph showing the mm-luminosities and X-ray luminosities of our sample galaxies, with the results of classical torus models and ADAF models overplotted. The torus models underpredict the mm luminosity of our sources by >2 orders of magnitude, while the ADAF grid explains them much better

Recently group member Ilaria Ruffa had an exciting new paper hit the arXiv. We find the existence of a 3D plane connecting the masses of supermassive black holes to their nuclear millimetre and X-ray luminosities, in our sample of AGN! Check it out here https://arxiv.org/abs/2307.13872

04.08.2023 14:00 β€” πŸ‘ 7    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Even worse (or better!): mJy/beam :-)

04.08.2023 09:08 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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Exciting news today, as my institution has finally allowed me to learn to read, after years of only (seniorly) lecturing. Looking forward to tackling my to-read pile now!

01.08.2023 16:34 β€” πŸ‘ 6    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Figure 2 from Crain & van de Voort 2023. Caption:
Schematic illustration of the extreme dynamic range of the length scales of the physical processes influencing the formation and evolution of galaxies. Cosmological, hydrodynamical simulations are able to follow cosmic structure formation up to O(100 Mpc) scales but have to resort to subgrid models on small scales. Future simulations of the galaxy population will push both of these boundaries, increasing their dynamic range, but the need for subgrid models will remain for years to come.

Figure 2 from Crain & van de Voort 2023. Caption: Schematic illustration of the extreme dynamic range of the length scales of the physical processes influencing the formation and evolution of galaxies. Cosmological, hydrodynamical simulations are able to follow cosmic structure formation up to O(100 Mpc) scales but have to resort to subgrid models on small scales. Future simulations of the galaxy population will push both of these boundaries, increasing their dynamic range, but the need for subgrid models will remain for years to come.

Great summary figure from Crain & van de Voort (2023) review of hydrodynamic simulations showing length scales from stellar interiors to the size of the Universe, along with regimes where baryonic physics can be treated explicitly versus approximately in simulations. πŸ§ͺπŸ”­https://tinyurl.com/y3shhxft

26.07.2023 20:52 β€” πŸ‘ 9    πŸ” 8    πŸ’¬ 0    πŸ“Œ 0

How do you do a thread here? Or do you just have to post each, and reply to yourself?

27.07.2023 12:59 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I saw someone say that's a current bug indeed.

27.07.2023 10:34 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

They seem to be under "My Feeds" on the left.

27.07.2023 10:01 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Psst... new skeeters... do you like astronomy? Then you should check out the astronomy feed!

25.07.2023 06:31 β€” πŸ‘ 79    πŸ” 49    πŸ’¬ 6    πŸ“Œ 3

Made the leap over. Thanks, @spacedramber.bsky.social for the invite!

21.07.2023 11:16 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

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