eisstrom

8 ms·

1.
by eisstrom 3y ago
You might be interested in Aritcle 8 of the European Convention on Human Rights ( https://en.wikipedia.org/wiki/Article_8_of_the_European_Conv... ). It was recently used to declare the UK's mass surveillance unlawfu
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by eisstrom 4y ago
Obama did the same in 2014 https://www.reuters.com/article/us-usa-eu-summit-idUSBREA2P0... And the Bush administration tried to prevent Nord Stream I. https://www.spiegel.de/international/world&#x2
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by eisstrom 4y ago
DB is not privatized, it is 100% state-owned. As far as I know, all ICE power cars are still in use today, except for the one destroyed in the Eschede accident.
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by eisstrom 6y ago
Spiegel Online found out that (for some reason) parts of the text are visible in the bookmarks of the PDF if it is right after a section heading. This includes the redacted text. paywall: https://www.spiegel.de/politik/
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by eisstrom 6y ago
I just checked the twitter account of the first author (who does not seem to be currently affiliated with any scientific institution). I can only understand his German and English tweets. He likes to push his own book, retweeted a post cla
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by eisstrom 6y ago
I have experience only with the Very Large Telescope run by ESO in Chile, maybe what I write is only valid there. There is usually no real schedule of targets for ground-based telescopes. There are two ways chosen at the telescope: either t
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by eisstrom 6y ago
In short: No, we cannot do that at the moment. We have photometric all-sky surveys that can map the entire sky (visible from the telescope location) during a night up to a certain brightness. But those only take images of the sky, not spect
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by eisstrom 8y ago
I like NGC 3201 because we found a stellar mass black hole in it ( https://www.eso.org/public/news/eso1802/ ). There should be many more of them in all clusters, but they are hard to find. Theorists can use thi
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by eisstrom 8y ago
Not sure if you meant it like this but redshift estimation comes to my mind. The farther away a galaxy is, the redder it becomes. You can measure the distance (redshift) from galaxy spectra (with MUSE for example) but not from directly HST
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by eisstrom 8y ago
Absolutely! When the lasers are used, MUSE uses a filter at the correct wavelength (Natrium D) to get rid of the laser photons. Only one telescope is currently equipped with lasers. The other ones can't observe the same region of the s
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by eisstrom 8y ago
I was comparing it to HST WFC3 with a field of view of 160 x 160 arcsec^2 ( https://www.spacetelescope.org/about/general/instruments/wfc... ). Thats about 450 times larger than the MUSE narrow-field mode FOV. I
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by eisstrom 8y ago
This is very much unexplored territory, but ESO thinks so. The ELT ( https://www.eso.org/public/teles-instr/elt/ ) will use more lasers but the exact configuration is still work in progress, as far as I know.
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by eisstrom 8y ago
Exactly! One datacube that comes out from the instrument contains 300 x 300 spectra. This is actually the main capability of the instrument which has 24 individual spectrographs. Here's a nice animation of the path the light takes ins
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by eisstrom 8y ago
Yes, the diffraction limit is meant here. The VLT has four 8 m mirrors, for each of them the angular resolution limit is = wavelength/diameter = 8 * 10^(-8) rad. The practical resolution of the new narrow-field mode is about 4*10^(-7)
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by eisstrom 8y ago
The advantage of MUSE is that you get all color information, i. e. the flux at any wavelength from blue to red. In principle, one can use this together with the sensitivity curve for our eyes to construct a natural image. In this case, I th
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by eisstrom 8y ago
We can achieve a very high resolution from the ground but only in a very small field of view. To cover one typical HST image with MUSE at the VLT, we would need a mosaic of hundreds of exposures. The reason for this are the four artificial
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by eisstrom 8y ago
In this narrow-field mode of MUSE, the CCD detector can resolve 0.025 arcseconds per pixel (arcsecond is a weird unit for angles used in astronomy). At the current distance to Neptune (according to wolframalpha: about 30 au = 4.5 bn km), th
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by eisstrom 8y ago
I'm a PhD student working with data of globular clusters from this instrument for quite some time now. I will be happy to answer your questions!
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by eisstrom 8y ago
Does anyone know similar books? I. e. about the history of a company from an insider's perspective?
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by eisstrom 9y ago
I was tired of going through arxiv's rss feeds so I wrote a script that sends me a mail if there is anything interesting. http://myarxiv.org/
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Show HN: Keyword-based custom arxiv newsletter(myarxiv.org)
2 points by eisstrom 10y ago|0 comments