Knud Jahnke
@knudjahnke.bsky.social
Astronomer, Euclid Consortium functionary; likes black holes, galaxies, and sustainable research.
November 6, 2025 at 7:37 PM
July 26, 2025 at 6:53 PM
The plums needed to be washed, for which "bathtub" was the perfect utensil. We ended with 72 kg of plums. There is still a bit if space in these 60 liter barrels, so we might add another 10 kg or so tomorrow.
#brandy #distilling
3/
#brandy #distilling
3/
July 26, 2025 at 6:53 PM
The plums needed to be washed, for which "bathtub" was the perfect utensil. We ended with 72 kg of plums. There is still a bit if space in these 60 liter barrels, so we might add another 10 kg or so tomorrow.
#brandy #distilling
3/
#brandy #distilling
3/
July 26, 2025 at 6:53 PM
Today I helped a friend harvest wild plums from a tree on a strip of land they rent here in #Heidelberg.
There were a few of them:
#brandy #distilling
1/
There were a few of them:
#brandy #distilling
1/
July 26, 2025 at 6:53 PM
Today I helped a friend harvest wild plums from a tree on a strip of land they rent here in #Heidelberg.
There were a few of them:
#brandy #distilling
1/
There were a few of them:
#brandy #distilling
1/
So, overall: yes, these single-armed spirals and lopsided mass distributions exist, can create sustained gas transport to add substantial mass to the #BlackHole over time, and they are independent of galaxy interactions.
This might be _the_ dominating mode of black hole growth since z=1!
12/14
This might be _the_ dominating mode of black hole growth since z=1!
12/14
June 27, 2025 at 10:56 AM
So, overall: yes, these single-armed spirals and lopsided mass distributions exist, can create sustained gas transport to add substantial mass to the #BlackHole over time, and they are independent of galaxy interactions.
This might be _the_ dominating mode of black hole growth since z=1!
12/14
This might be _the_ dominating mode of black hole growth since z=1!
12/14
A log(M*/M_sun)=7.5-9.3 stellar component is lopsided with respect to the center of the #galaxy and #BlackHole, that is capable of excerting enough torque to drive the gas transport in the spiral, while at the same time getting some gas from it, sustaining the off-center mass distribution.
11/14
11/14
June 27, 2025 at 10:56 AM
A log(M*/M_sun)=7.5-9.3 stellar component is lopsided with respect to the center of the #galaxy and #BlackHole, that is capable of excerting enough torque to drive the gas transport in the spiral, while at the same time getting some gas from it, sustaining the off-center mass distribution.
11/14
11/14
Amazing! The rest of the work was to (a) get extremely high-resolution #ALMA data to characterise cold gas content and velocity structure of this spiral, #ESOVLT #MUSE spectroscopy for stellar kinematic analysis and new #HST data for mass distributions. Took several years...
8/14
8/14
June 27, 2025 at 10:56 AM
Yesterday was 🔭 #PaperDay! How do supermassive #BlackHoles get the gas that makes them grow to huge masses? This gas ultimately has to come from their host galaxy, but has to lose 99.9% of its angular momentum in the process. So how does that work?
ui.adsabs.harvard.edu/abs/2025arXi...
1/14
ui.adsabs.harvard.edu/abs/2025arXi...
1/14
June 27, 2025 at 10:56 AM
Yesterday was 🔭 #PaperDay! How do supermassive #BlackHoles get the gas that makes them grow to huge masses? This gas ultimately has to come from their host galaxy, but has to lose 99.9% of its angular momentum in the process. So how does that work?
ui.adsabs.harvard.edu/abs/2025arXi...
1/14
ui.adsabs.harvard.edu/abs/2025arXi...
1/14
So I guess later today I'll be wearing my #LSST pin? Got it at the 2009 IAU meeting in Rio. Now the #VeraRubinObservatory is nearing its completion and the first image is to be revealed in a couple of hours.
rubinobservatory.org/news/rubin-f...
(And I'm one of the International Data Rights Holder)
rubinobservatory.org/news/rubin-f...
(And I'm one of the International Data Rights Holder)
June 23, 2025 at 12:27 PM
So I guess later today I'll be wearing my #LSST pin? Got it at the 2009 IAU meeting in Rio. Now the #VeraRubinObservatory is nearing its completion and the first image is to be revealed in a couple of hours.
rubinobservatory.org/news/rubin-f...
(And I'm one of the International Data Rights Holder)
rubinobservatory.org/news/rubin-f...
(And I'm one of the International Data Rights Holder)
Veeeeery nice!
(We recently took this version. But with a larger telescope and different location 😀)
@ec-euclid.bsky.social
(We recently took this version. But with a larger telescope and different location 😀)
@ec-euclid.bsky.social
June 1, 2025 at 9:09 PM
Veeeeery nice!
(We recently took this version. But with a larger telescope and different location 😀)
@ec-euclid.bsky.social
(We recently took this version. But with a larger telescope and different location 😀)
@ec-euclid.bsky.social
Sorry, but even without additional tariffs no-one outside the US is buying Teslas anymore. The stock price will eventually fall to <100$, where it belongs.
April 9, 2025 at 6:38 PM
Sorry, but even without additional tariffs no-one outside the US is buying Teslas anymore. The stock price will eventually fall to <100$, where it belongs.
#ESA #Gaia will be switched off this morning, after more than a decade of revolutionizing #astronomy.
And this morning I'm sitting in front of a stage with a scale model of Gaia - and #ESA's current central astronomy mission, #Euclid.
And this morning I'm sitting in front of a stage with a scale model of Gaia - and #ESA's current central astronomy mission, #Euclid.
March 27, 2025 at 8:16 AM
#ESA #Gaia will be switched off this morning, after more than a decade of revolutionizing #astronomy.
And this morning I'm sitting in front of a stage with a scale model of Gaia - and #ESA's current central astronomy mission, #Euclid.
And this morning I'm sitting in front of a stage with a scale model of Gaia - and #ESA's current central astronomy mission, #Euclid.
I've just scored my 3rd #Euclid #LEGO model. The largest one has close to 900 parts, this one is ... smaller.
@ec-euclid.bsky.social
@ec-euclid.bsky.social
March 24, 2025 at 1:02 PM
I've just scored my 3rd #Euclid #LEGO model. The largest one has close to 900 parts, this one is ... smaller.
@ec-euclid.bsky.social
@ec-euclid.bsky.social
It flew at 300m altitude across downtown Tallinn.
February 24, 2025 at 1:41 PM
It flew at 300m altitude across downtown Tallinn.
After this I lost interest:
February 20, 2025 at 8:44 PM
After this I lost interest:
I think it's due to an undocumented Boeing switch.
(I do hope everyone will be fine in the end in Toronto. At least as fine as you can be when your plane flips upside down...)
(I do hope everyone will be fine in the end in Toronto. At least as fine as you can be when your plane flips upside down...)
February 17, 2025 at 9:28 PM
I think it's due to an undocumented Boeing switch.
(I do hope everyone will be fine in the end in Toronto. At least as fine as you can be when your plane flips upside down...)
(I do hope everyone will be fine in the end in Toronto. At least as fine as you can be when your plane flips upside down...)
That's not what my browser thinks. But after "loading" for a while the search mask appears, but doesn't produce any result.
February 17, 2025 at 10:26 AM
That's not what my browser thinks. But after "loading" for a while the search mask appears, but doesn't produce any result.
January 31, 2025 at 4:51 PM
The #sun has had enhanced proton emissions over the past 2.5 days or so, and #ESAEuclid actually notices with more #cosmicray hits:
#astronomy #science
#astronomy #science
December 23, 2024 at 6:53 PM
The #sun has had enhanced proton emissions over the past 2.5 days or so, and #ESAEuclid actually notices with more #cosmicray hits:
#astronomy #science
#astronomy #science