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Dark Energy Survey @TheDESurvey
22h
Text & Illustration: Jessie Muir @jlynnmuir This paper introduces the method we use to transform the data:… https://t.co/evxykdA2O0

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Dark Energy Survey @TheDESurvey
22h
To make sure we don’t unintentionally bias DES dark energy constraints towards results we expect, we transform the… https://t.co/ICCMBEec0a

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Dark Energy Survey @TheDESurvey
Jan 25
RT @NOIRLabAstro:In this #NOIRLab #ImageOfTheWeek the dark cloud-like structures pictured above the Víctor M. #Blanco 4-meter… https://t.co/j6k3kdLNlX

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Dark Energy Survey @TheDESurvey
Jan 19
Text: Andresa Campos @AndresaCampos Illustration: Jessie Muir @jlynnmuir The paper describing how we quantify th… https://t.co/IZFhU2FBMo

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Dark Energy Survey @TheDESurvey
Jan 19
Different measurements of the large-scale Universe give us pieces of a big picture describing its properties. If DE… https://t.co/szmBzdlTi4

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The Dark Energy Survey
22 hours 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
3 days ago
Timeline PhotosA Stellar Storm - At first glance, it looks as though storm clouds are gathering over the Víctor M. Blanco 4-meter Telescope. Situated at the Cerro Tololo Inter-American Observatory (CTIO), a Program of NSF’s NOIRLab, the Blanco experiences few stormy nights at its location near the arid Chilean Atacama Desert. The dark cloud-like structures pictured here are in fact dusty areas of the Milky Way that absorb visible light. The bright glittering fringes are not lightning, but thousands of stars — just some of the billions within our galaxy.

For more images of the week, visit our website ow.ly/YXub50CP1eW.
Credit: CTIO/NOIRLab/NSF/AURA/R. Sparks

#ImageOfTheWeek #NOIRLab #NSFstories #Astronomy #Space #Universe #DiscoverTogether #CTIO @cerrotololo #Blanco #Chile ... See MoreSee Less
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The Dark Energy Survey
1 week ago
Different measurements of the large-scale Universe give us pieces of a big picture describing its properties. If DES results don’t match what we expect from other observations, we might have discovered something new! #darkbites

Text: Andresa Campos
Illustration: Jessie Muir

The paper describing how we quantify the agreement or disagreement of different datasets is here: arxiv.org/abs/2012.09554 ... See MoreSee Less
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The Dark Energy Survey
2 weeks ago
The paper describing our Data Release 2 is now also online!

arxiv.org/abs/2101.05765 ... See MoreSee Less
The Dark Energy Survey Data Release 2
arxiv.org
We present the second public data release of the Dark Energy Survey, DES DR2, based on optical/near-infrared imaging by the Dark Energy Camera mounted on the 4-m Blanco telescope at Cerro Tololo Inter...
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The Dark Energy Survey
2 weeks ago
DES is pleased to announce our full data release (Data Release 2) is now public! This release contains data from all six years of our observations and includes around 691 million objects!!

Read more about our DR2 release here, including talks at this week's American Astronomical Society meeting:

news.fnal.gov/2021/01/dark-energy-survey-makes-public-catalog-of-nearly-700-million-astronomical-...

You can access the data at this site, hosted by the National Center for Supercomputing Applications:
des.ncsa.illinois.edu/releases/dr2

#ncsaatillionois #noirlabastro #AAS237 #desdr2 ... See MoreSee Less
Dark Energy Survey makes public catalog of nearly 700 million astronomical objects
news.fnal.gov
The international collaboration, including Fermilab, the National Center for Supercomputing Applications, NOIRLab and others, releases a massive, public collection of astronomical data and calibrated ...
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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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