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  • The DES Project
    • Overview
    • Science
    • Instrument
    • Survey
    • Collaboration
    • Scientist of the Week
    • For DES Members
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TheDESurvey @TheDESurvey
Dark Energy Survey  @TheDESurvey
14h
OTD 2 years ago😮🎨🎨🎨 https://t.co/NTGoG1Cb8Z
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Dark Energy Survey  @TheDESurvey
Jan 19
RT @NOIRLabAstro:A startling analysis from @GLOBEatNight, a citizen science program run by @NSF’s @NOIRLabAstro, concludes that star… https://t.co/5FzC4CAGlK
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Dark Energy Survey  @TheDESurvey
Jan 18
RT @NOIRLabAstro:Astronomers have released a giant survey of the galactic plane of the Milky Way with data taken with the Dark Energ… https://t.co/FaXkxJcP7E
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Dark Energy Survey  @TheDESurvey
Jan 17
Congratulations to DEScientist @astroalexamon ! https://t.co/UKSOKwn1tZ
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Dark Energy Survey  @TheDESurvey
Jan 12
RT @DoNASAScience:25 years ago this weekend, the discovery of #DarkEnergy was first announced! Now, you can become a Dark Energy Expl… https://t.co/WXPtbiZmgR
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The Dark Energy Survey
14 hours ago
The Dark Energy Survey

OTD 2 years ago 😮🎨🎨🎨To make sure we don’t unintentionally bias DES dark energy constraints towards results we expect, we transform the data to look like it comes from a different Universe. When we finally reveal the real result, it’s very exciting — like opening a present! #darkbites

Text & Illustration: Jessie Muir

This paper introduces the method we use to transform the data: arxiv.org/pdf/1911.05929.pdf

Cosmologists and DEScientists will recognize many incredible details across this #darkbite! Our international zoom discussions, the 'contour plots' we use to interpret our results, and even some of our Chilean neighbors, the viscachas, make an appearance. ... See MoreSee Less

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The Dark Energy Survey
1 week ago
The Dark Energy Survey

A startling analysis from Globe at Night — a citizen science program run by National Science Foundation (NSF)’s NOIRLab — concludes that stars are disappearing from human sight at an astonishing rate. The study finds that, to human eyes, artificial lighting has dulled the night sky more rapidly than indicated by satellite measurements. The study published in the journal Science showcases the unique contributions that citizen scientists can make in essential fields of research.

Read more: www.noirlab.edu/public/news/noirlab2302/

Image: NOIRLab/NSF/AURA, P. Marenfeld

#NSFScience #NOIRLab #Astronomy #ScienceNews #DiscoverTogether ... See MoreSee Less

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The Dark Energy Survey
1 week ago
The Dark Energy Survey

Timeline photosAstronomers have released a gargantuan survey of the galactic plane of the Milky Way. The new dataset contains a staggering 3.32 billion celestial objects — arguably the largest such catalog so far. The data for this unprecedented survey were taken with the Dark Energy Camera, built by the U.S. Department of Energy, at Cerro Tololo Inter-American Observatory (CTIO) in Chile, a Program of National Science Foundation (NSF)'s NOIRLab.

Read more: ow.ly/sghN50MuoxB

In this image the survey is shown here overlaid on the full sky. The callout box is a full-resolution view of a small portion of the DECaPS2 data.

Credit: DECaPS2/DOE/FNAL/DECam/CTIO/NOIRLab/NSF/AURA/E. Slawik
Image processing: M. Zamani & D. de Martin (NSF’s NOIRLab) ... See MoreSee Less

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Awesome‼️

The Dark Energy Survey
2 weeks ago
The Dark Energy Survey

Congratulations to DEScientist Alexandra Amon on winning the 2023 Royal Astronomical Society Winton Award!

"a very talented young scientist who is rapidly emerging as one of the new leaders in observational cosmology." ras.ac.uk/sites/default/files/2023-01/Winton%20Award%20%28A%29%20-%20Dr%20Alexandra%20Amon.pdf ... See MoreSee Less

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Congrats Alex Amon!

The Dark Energy Survey
2 weeks ago
The Dark Energy Survey

Timeline photosNEWS: National Science Foundation (NSF) and SpaceX have finalized a coordination agreement to mitigate the impact of the company’s Starlink satellites on ground-based radio-, optical-, and infrared-astronomy facilities.

The agreement, detailed in a statement released by NSF today, ensures that Starlink satellite network plans will meet international radio astronomy protection standards while working toward recommendations that came from NOIRLab and the AAS’s SATCON workshops and the IAU’s Dark and Quiet Skies best practice guidance.

NOIRLab serves as the key point of contact for technical exchanges with SpaceX on optical and infrared issues and National Radio Astronomy Observatory (NRAO) for radio-astronomy issues. NOIRLab also provides community leadership on mitigation issues by co-hosting the IAU CPS: the International Astronomical Union Centre for the Protection of the Dark and Quiet Sky from Satellite Constellation Interference (CPS).

Read more here: noirlab.edu/public/announcements/ann2304/?nocache
Image: International Gemini Observatory/NOIRLab/NSF/AURA/J. Chu/J. Pollard ... See MoreSee Less

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News

Scientists Leverage HPC and AI to Wrangle the ‘Galaxy Zoo’

July 8, 2019 12:00 pm

The research team developed a new approach to classifying these hundreds of millions of galaxies. Instead of relying on crowdsourced classification, the researchers used knowledge from the state-of-the-art Xception neural network, combined with the datasets generated by the Galaxy Zoo project, to train its deep learning models. They then applied the trained model to galactic images from the Dark Energy Survey (DES) – where it achieved a 99.6% accuracy in identifying spiral and elliptical galaxies.

Three sky surveys completed in preparation for Dark Energy Spectroscopic Instrument

July 8, 2019 12:00 pm

It took three sky surveys — conducted at telescopes in two continents, covering one-third of the visible sky, and requiring almost 1,000 observing nights – to prepare for a new project that will create the largest 3-D map of the universe’s galaxies and glean new insights about the universe’s accelerating expansion. This Dark Energy Spectroscopic Instrument (DESI) project will explore this expansion, driven by a mysterious property known as dark energy, in great detail. It could also make unexpected discoveries during its five-year mission.

Multiple Measurements close in on Dark Energy

May 6, 2019 12:00 pm

An extensive analysis of four different phenomena within the universe points the way to understanding the nature of dark energy, a collaboration between more than 100 scientists reveals. Dark energy – the force that propels the acceleration of the expanding universe – is a mysterious thing. It’s nature, write telescope scientist Timothy Abbott from the Cerro Tololo Inter-American Observatory, in Chile, and colleagues, “is unknown, and understanding its properties and origin is one of the principal challenges in modern physics”. Indeed, there is a lot at stake. Current measurements indicate that dark energy can be smoothly incorporated into the theory of general relativity as a cosmological constant; but, the researchers note, those measurements are far from precise and incorporate a wide range of potential variations.

Viewpoint: Dark Energy Faces Multiple Probes

May 1, 2019 12:00 pm

One of the top goals in cosmology today is understanding the dark energy that is responsible for the accelerated expansion of the Universe. Is the dark energy consistent with the cosmological constant of general relativity—representing a constant energy density filling space homogenously? Or can we find deviations from general relativity on cosmological scales that suggest a more complex nature for gravity? Questions like these motivate the current and next generations of surveys that aim to map out ever larger volumes of the Universe, using a wide variety of probes to constrain the properties of dark energy. The Dark Energy Survey (DES) has now derived such constraints from the combined analysis of four canonical observables related to dark energy: supernovae, baryon acoustic oscillations, gravitational lensing, and galaxy clustering [1]. The resulting bounds confirm what we knew from previous studies, which focused on single probes. But the results indicate that this multiprobe approach could allow surveys in the 2020s to improve such constraints by orders of magnitude, possibly bringing us close to solving the dark energy puzzle.

Supernovae, Dark Energy, and the Fate of Our Universe

April 5, 2019 12:00 pm

What’s the eventual fate of our universe? Is spacetime destined to continue to expand forever? Will it fly apart, tearing even atoms into bits? Or will it crunch back in on itself? New results from Dark Energy Survey supernovae address these and other questions. At present, the fabric of our universe is expanding — and not only that, but the its expansion is accelerating. To explain this phenomenon, we invoke what’s known as dark energy — an unknown form of energy that exists everywhere and exerts a negative pressure, driving the expansion. Since this idea was first proposed, we’ve conducted decades of research to better understand what dark energy is, how much of it there is, and how it influences our universe.

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