Erik Tollerud
@eteq.bsky.social
Astrophysicist, Python coder, and general lover of nature in all its forms. Tweets are my own. He/they.
Gotta share this from @emily.space 's excellent #adassxxxv talk on ATProtocol (the thing behind Blue sky) and how it's a chance to free scientists from the profit-motivated version of social media. More to the point, I love the metaness of posting a talk on bluesky about bluesky.
November 11, 2025 at 4:38 PM
Gotta share this from @emily.space 's excellent #adassxxxv talk on ATProtocol (the thing behind Blue sky) and how it's a chance to free scientists from the profit-motivated version of social media. More to the point, I love the metaness of posting a talk on bluesky about bluesky.
This slide by @mubdi.bsky.social at #adass2025 should be on ever astronomer's wall. Software is a central part of science and should be published accordingly!
November 11, 2025 at 11:22 AM
This slide by @mubdi.bsky.social at #adass2025 should be on ever astronomer's wall. Software is a central part of science and should be published accordingly!
Who could have guessed this administration would have a lot of trouble with classified information. Oh wait ... That's right...
March 24, 2025 at 11:28 PM
Who could have guessed this administration would have a lot of trouble with classified information. Oh wait ... That's right...
Some amazing cosmology results from DESI presented at #AAS245 by M Ishak (from their massive paper drop in Nov): Hubble tension persists with DESI (DESI matches CMB, in tension with local H0)... But more provocatively, cosmological constant ruled out at > 3 sigma!!! But no deviations from GR. 🙀
January 14, 2025 at 4:41 PM
Some amazing cosmology results from DESI presented at #AAS245 by M Ishak (from their massive paper drop in Nov): Hubble tension persists with DESI (DESI matches CMB, in tension with local H0)... But more provocatively, cosmological constant ruled out at > 3 sigma!!! But no deviations from GR. 🙀
Exciting professional news: I have just been awarded Tenure at the Space Telescope Science Institute! Thanks to all of you who have supported and encouraged me these 15 or so years. I came for the science but stayed for the community, and this is a good day to celebrate both! #bluedrink
October 16, 2024 at 10:08 PM
Exciting professional news: I have just been awarded Tenure at the Space Telescope Science Institute! Thanks to all of you who have supported and encouraged me these 15 or so years. I came for the science but stayed for the community, and this is a good day to celebrate both! #bluedrink
E di Teodoro in #iaus392 at #astronomy2024 (with @jegpeek.bsky.social) gives a really nice clean story of disentangling gas flow directions to show that at least radial gas flows aren't bringing in enough fuel to sustain star formation at the present day
August 15, 2024 at 9:36 AM
E di Teodoro in #iaus392 at #astronomy2024 (with @jegpeek.bsky.social) gives a really nice clean story of disentangling gas flow directions to show that at least radial gas flows aren't bringing in enough fuel to sustain star formation at the present day
Nice summary of some LADUMA results in talk by A Baker from #iaus392 at #astronomy2024. Particularly neat was showing work by @jwuphysics.bsky.social showing that you can pick out even individually undetected HI features using CNNs trained on multiwavelength data
August 14, 2024 at 2:57 PM
Nice summary of some LADUMA results in talk by A Baker from #iaus392 at #astronomy2024. Particularly neat was showing work by @jwuphysics.bsky.social showing that you can pick out even individually undetected HI features using CNNs trained on multiwavelength data
From J Healy in #iaus392 at #astronomy2024 : in an HI survey of cluster Abell 2636 (with MeerKAT I *think*), some evidence that subgroups within the cluster protect galaxies' gas from the broader cluster environment. I wonder if this happens at LG scales (and if it could ever be observed...)?
August 14, 2024 at 9:46 AM
From J Healy in #iaus392 at #astronomy2024 : in an HI survey of cluster Abell 2636 (with MeerKAT I *think*), some evidence that subgroups within the cluster protect galaxies' gas from the broader cluster environment. I wonder if this happens at LG scales (and if it could ever be observed...)?
Neat dataset by P Mancera Piña at #astronomy2024 of HI rotation curves of several UDGs, showing that while their dark matter halo concentrations are hard to explain in CDM (and even harder with MOND), they are much more likely to exist in SIDM...
August 13, 2024 at 2:21 PM
Neat dataset by P Mancera Piña at #astronomy2024 of HI rotation curves of several UDGs, showing that while their dark matter halo concentrations are hard to explain in CDM (and even harder with MOND), they are much more likely to exist in SIDM...
F Maccagni at #iaus392 of #astronomy2024 describes HI stripping data from a MeerKAT survey of the Fornax cluster. I found this plot especially impressive: a *very* clear floor where all the has gets stripped under a certain magnitude
August 13, 2024 at 12:42 PM
F Maccagni at #iaus392 of #astronomy2024 describes HI stripping data from a MeerKAT survey of the Fornax cluster. I found this plot especially impressive: a *very* clear floor where all the has gets stripped under a certain magnitude
E de Blok kicks off #iaus392 main session at #astronomy2024 by summarizing resolved HI observations now and in the near future. One fresh item I thought was especially interesting: "observing" TNG50 and FIRE2 sims just like MEERKAT shows the simulations are not getting the fluffy outskirts right
August 13, 2024 at 9:05 AM
E de Blok kicks off #iaus392 main session at #astronomy2024 by summarizing resolved HI observations now and in the near future. One fresh item I thought was especially interesting: "observing" TNG50 and FIRE2 sims just like MEERKAT shows the simulations are not getting the fluffy outskirts right
K Oman kicks off the theory side of #iaus392 at #astronomy2024 with an overview of how simulations resolve (or sometimes don't!) HI gas in galaxies
August 13, 2024 at 7:33 AM
K Oman kicks off the theory side of #iaus392 at #astronomy2024 with an overview of how simulations resolve (or sometimes don't!) HI gas in galaxies
C Spekkens at the opening talk of #iaus392 @ #astronomy2024 gives a great overview of what the near future looks like for neutral hydrogen surveys especially with SKA
August 13, 2024 at 7:01 AM
C Spekkens at the opening talk of #iaus392 @ #astronomy2024 gives a great overview of what the near future looks like for neutral hydrogen surveys especially with SKA
Great talk by A Chiti at #astronomy2024 about the detailed abundances of v. low metallicity stars, esp in the LMC where the alpha to iron ratios are clearly very different from MW. Also, more coming from the MAGIC survey!
August 12, 2024 at 2:18 PM
Great talk by A Chiti at #astronomy2024 about the detailed abundances of v. low metallicity stars, esp in the LMC where the alpha to iron ratios are clearly very different from MW. Also, more coming from the MAGIC survey!
Great overview by @karenlmasters.bsky.social at #astronomy2024 of Galaxy Zoo, the prototypical citizen science program in astro, and birthplace of the zooniverse platform. And it just keeps going, with new results from desi, and some impressive machine learning classification tooling!
August 12, 2024 at 2:14 PM
Great overview by @karenlmasters.bsky.social at #astronomy2024 of Galaxy Zoo, the prototypical citizen science program in astro, and birthplace of the zooniverse platform. And it just keeps going, with new results from desi, and some impressive machine learning classification tooling!
At #astronomy2024, a neat talk about a Galactic BH discovered from Gaia and conclusively demonstrating 1) it's very massive 2) very metal poor progenitor, and 3) part of the halo, not the disk or bulge. Might even by from a disrupted dwarf galaxy! (Last bit my editorializing)
August 9, 2024 at 12:08 PM
At #astronomy2024, a neat talk about a Galactic BH discovered from Gaia and conclusively demonstrating 1) it's very massive 2) very metal poor progenitor, and 3) part of the halo, not the disk or bulge. Might even by from a disrupted dwarf galaxy! (Last bit my editorializing)
🔭@DGSCS - last talk by A Dropulic tells us about Streamgen and how you can learn a lot about predicted statistics of streams and how they change as you change galaxy formation parameters and the nature of dark matter
July 10, 2024 at 9:38 PM
🔭@DGSCS - last talk by A Dropulic tells us about Streamgen and how you can learn a lot about predicted statistics of streams and how they change as you change galaxy formation parameters and the nature of dark matter
🔭@DGSCS - K Vivas shows us a beautifully clear DECam dataset of Crater II RR Lyrae. It is clearly disrupting, with all kinds of interesting structure and variable stars.
July 10, 2024 at 9:22 PM
🔭@DGSCS - K Vivas shows us a beautifully clear DECam dataset of Crater II RR Lyrae. It is clearly disrupting, with all kinds of interesting structure and variable stars.
🔭@DGSCS - A Pace gives shares a whole bunch of different results in large area spectroscopy of classical (ish) dwarf spheroidals
July 10, 2024 at 8:59 PM
🔭@DGSCS - A Pace gives shares a whole bunch of different results in large area spectroscopy of classical (ish) dwarf spheroidals
🔭@DGSCS - T Li gives us a lightning fast overview of the S5 Survey - lots of science areas, too much to summarize, read the papers...
July 10, 2024 at 7:48 PM
🔭@DGSCS - T Li gives us a lightning fast overview of the S5 Survey - lots of science areas, too much to summarize, read the papers...
🔭@DGSCS - J Nibauer tells us all about modeling perturbations of stellar streams to constrain DM models. While there's a whole nest formalism, preliminary applications to data basically say "CDM is all you need", although LMCs impact is a wild card
July 10, 2024 at 7:25 PM
🔭@DGSCS - J Nibauer tells us all about modeling perturbations of stellar streams to constrain DM models. While there's a whole nest formalism, preliminary applications to data basically say "CDM is all you need", although LMCs impact is a wild card
🔭@DGSCS - starting off the last afternoon with A Bonaca first telling us all about MW stellar streams, what we'll be seeing in the LSST Era, and the secret weapon for follow up: the VIA instrument!
July 10, 2024 at 7:01 PM
🔭@DGSCS - starting off the last afternoon with A Bonaca first telling us all about MW stellar streams, what we'll be seeing in the LSST Era, and the secret weapon for follow up: the VIA instrument!
🔭@DGSCS - R Errani describes how small/faint MW dwarfs and their tidal interaction with the MW can be very sensitive to different forms of dark matter
July 10, 2024 at 3:17 PM
🔭@DGSCS - R Errani describes how small/faint MW dwarfs and their tidal interaction with the MW can be very sensitive to different forms of dark matter
🔭@DGSCS - S Smith describes a thorough characterization of UMa III/UNIONS 1, the new-found and by a wide margin faintest MW satellite. Still ambiguous if it's a galaxy or a star cluster because of how few stars there are... Although at this point my money is on galaxy which is WILD!
July 10, 2024 at 3:05 PM
🔭@DGSCS - S Smith describes a thorough characterization of UMa III/UNIONS 1, the new-found and by a wide margin faintest MW satellite. Still ambiguous if it's a galaxy or a star cluster because of how few stars there are... Although at this point my money is on galaxy which is WILD!
🔭@DGSCS - W Cerny kicks off the last day of talks with a great thorough investigation of the most compact end of the dwarf galaxy or maybe star cluster population. Spoiler alert: they are probably a heterogenous population!
July 10, 2024 at 2:38 PM
🔭@DGSCS - W Cerny kicks off the last day of talks with a great thorough investigation of the most compact end of the dwarf galaxy or maybe star cluster population. Spoiler alert: they are probably a heterogenous population!