DESI Survey
@desisurvey
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The DESI Survey will measure the properties of Dark Energy using a survey of 30+ million galaxy redshifts.
Kitt Peak, AZ
Joined January 2015
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Breaking news!🎉 Today we announce the most precise measurements of our expanding Universe using the BAO signal in 6.1 Million galaxies and quasars from Year 1, tracing dark energy through cosmic time. See
@BerkeleyLab
PR at 1/10
📸 Credit:
@ClaireLamman
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The first
#JWST
image is truly marvellous, congratulations to our colleagues for this great achievement! Of course we were curious how it compares to our ground-based legacy survey in the same field of view:
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1/🥳🌌 Exciting news! We're launching the DESI Early Data Release, featuring spectra from the Survey Validation phase (Dec20 - May21). Immerse yourself in the cosmos with ~750k galaxies from our "1% survey." Keep reading for a journey into the universe! (📹Credits: David Kirkby)
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🎉 Breaking Records with DESI! ✨ Last week, our survey achieved a groundbreaking milestone by observing a staggering 40 MILLION SPECTRA! 🔭 This marks the largest spectroscopic sample ever obtained, showcasing the power of DESI's capabilities. 🚀 1/5
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Tonight we witnessed a partial lunar eclipse, captured here by the weather cam at Kitt Peak National Observatory.
#DESI5000
#LunarEclipse
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After only 7 months we have measured the spectra of 7.5 million galaxies, surpassing the number of all extragalactic spectra ever measured before! GoDESI!
#DESI5000
#DarkEnergy
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Our BAO measurements agree with Planck ΛCDM (solid line), but indicate a slight preference for evolving dark energy (dashed line) instead of the standard cosmological constant Λ. 5/10
📸 Credit: Arnaud de Mattia, CEA Saclay
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Exploring the cosmos together! 🌌 Just had an exciting collaboration meeting in Durham getting ready for the Year-1 analysis! Many thanks to our colleagues at
@DarkerMatters
& admin staff for hosting this fruitful meeting!
#DarkEnergy
#DESI5000
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🎉🎉
As of today's 2-year anniversary of the start of the Main Survey we have measured 22M extragalactic and 7.5M stellar redshifts.✨ Many thanks to all who made this possible.💫 On to Year 3!
#DarkEnergy
#DESI5000
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Today is the anniversary of the first year of data collection for our main survey, which started on May 14, 2021! We have already collected 12.8 million extragalactic spectra and the data keeps pouring in at incredible rate! 🎉🎉🎉
#DESI5000
#DarkEnergy
#GoDESI
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After about 10 months, we have observed over 10 million extragalactic spectra! This would have never been possible without our unique focal plane system as explained here by BaoBan, the DESI Coyote:
#DESIgnedByDESI
Credits:
@ClaireLamman
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It’s a relief to see the KPNO facilities safe. Words can not describe our gratitude to all the personnel and firefighters working hard to protect the observatory. Thank you so much!
#ContreraFire
Update: See the aerial survey video of the Kitt Peak Observatory after aerial and on the ground firefighting crews protected the observatory and other scientific buildings from the fire.
#AZFire
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Again, thank you to the firefighters! We love you!
#ContrerasFire
#desi_is_grateful
Credit: Clara Delabrouille
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Our exciting cosmology results were presented today simultaneously at both the
@_Moriond_
and
@APSphysics
April meetings! Here a few impressions 1/4
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What do we learn from this map?The galaxy distribution tracks the subtle imprint of baryon acoustic oscillations (BAO), initial pressure waves frozen in after the universe became transparent. This provides a standard ruler at different cosmic epochs. 2/10
🎬Credit:
@ClaireLamman
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Finally (if you do not want to read through all of them) we have also set up this guide summarizing the papers and explaining how they are connected. Watch this space for more updates to come soon! 10/10
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Time to meet a DESI member: Claire Lamman !
Read the whole interview here:
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"Just moments ago... the 5000th [fiber] positioner was installed into the last production (10 of 10) petals. Congratulations to the technical team for this important milestone" -- Michael Levi, DESI Director
Another step closer to getting on the sky! ✨🔭
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Thrilled to announce our very own planetarium show “5000 Eyes” produced and directed by
@ClaireLamman
in collaboration with
@fiskeplanet
to be released to the public soon!
#DarkEnergy
#5000Eyes
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Congratulations to DESI Collabortor Antonella Palmese for the award of a prestigious Hubble/Einstein Fellowship!
NASA announcement here:
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Paper day! Again! 🎉 Yesterday we released a batch of supporting papers in prep (analysis applied to simulations only) for the full-shape analysis yet to come, and also presenting and validating our blinding scheme. Find the papers and explanations at . 1/2
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We also measure the BAO signal within the distribution of intergalactic gas. This is illuminated by distant quasars more than 11 Billion light years away, giving rise to Lyman-alpha absorption lines . 3/10
📸 Credit:
@NOIRLabAstro
/
@NSF
/
@AURADC
/ P. Marenfeld and DESI collab.
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… but we’re also seeing some potentially interesting differences that could indicate that dark energy is evolving with time. Those may or may not go away with more data, so we’re excited to start analyzing our three-year dataset soon.” 8/10
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Claire is also a talented artistic baker. Pic below is her cake-take of the Mayall telescope
@KittPeakNatObs
.
Anybody hungry ? Check out more of her creations at
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The absorption arises from the excitation of electrons within neutral hydrogen at different redshifts of the intervening gas, causing the so-called “Lyman-alpha forest” in the quasar spectrum depicted here. 4/10
📸 Credit: David Kirkby, UC Irvine
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We passed!🏆
"Just moments ago DESI passed its CD-4 Project Completion review. This was the independent project review conducted by DOE to establish the proper completion of the construction project. Congratulations to the project team & to the entire collaboration!" -- M. Levi
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DESI Collaborator Arjun Dey has been awarded a Guggenheim Fellowship!
Bravo and congratulations!
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The
#ContrerasFire
kept us breathless, years of research, all our dreams and visions, were at stake. Only because of the heroic effort of the firefighters we now come together full of hope. We are eternally grateful. Thank you so much!!!
#DESI_is_grateful
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Meet DESI ambassador BaoBan explaining his name in this comic by
@ClaireLamman
! Read the full story behind naming the coyote together with the Tohono O’odham Youth Council in this blogpost by
@Cosmosamu
:
…
#DESIgnedByDESI
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We released a suite of 8 papers presenting the characteristics of the targets that are used for the DESI survey. For a quick overview and a link to each paper see . (1/2)
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The full batch of research papers describing these results appear on the arxiv later today, and can temporarily be accessed from . Special thanks to all DESI collaborators contributing to this tremendous work. 9/10
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Some of our team members tonight
#WomenInSTEM
#WomeninScience
#WomenWhoCode
🖥️🔭
Claire Poppett (Lead Observer), Stéphanie Juneau (Observer) & Suk Sien Tie (Instrumentalist)
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So happy to present this interactive virtual tour through our amazing focal plane as it is featured in “5000 Eyes”. This tool allows you to dive in even deeper!
Credits: David Kirkby, University of California, Irvine
#5000Fibers
#DESIgnedByDESI
1/2
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DESI director Michael Levi, LBNL:“We’re incredibly proud of the data, which have produced world-leading cosmology results and are the first to come out of the new generation of dark energy experiments. So far, we’re seeing basic agreement with our best model of the universe…7/10
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Congratulations to Nathalie Palanque-Delabrouille for being elected to the French Academy of Sciences !
#WomenInScience
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This observing month is just amazing: with more than 100’000 spectra per night (see blogpost by David Schlegel) becoming the rule we are breaking more and more records. Stay tuned.
#DESI5000
#DarkEnergy
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Time to meet a DESI member: Dustin Lang !
Read the whole interview here:
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Exciting news: DESI to resume operations this month
@KittPeakNatObs
!
After a shutdown in March due to the global covid-19 pandemic, DESI is anticipating to undergo re-commissioning in the next few weeks. Next step after that ➡️ Survey Validation.
More:
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In order to target 30+ million galaxies and quasars, we're making a large mosaic of the sky (1/3 of full sky when complete).
The Legacy Survey (imaging) team just published the 7th data release (DR7):
Have a look at the Image Gallery!
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In celebration of International Day of Women, we are happy to share some quotes from
@desisurvey
’s scientists addressed to the future generation of scientists !
#DESI5000
#WomenInScience
Series of quotes coming until the end of March ✨
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🔭🎥 The Spanish version of our planetarium movie "5000 Eyes" is now available on YouTube! Don't miss this unique experience that takes you deep into the cosmos. 🚀🌠
🔗 ¡Mira el video ahora!
@BerkeleyLab
#Fiske
#DESI5000
#Astronom
ía
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From the Mayall to the Maya! 😀
Big thanks to our colleagues in Mexico for hosting such a fruitful collaboration meeting! 🙏
📸 Credits:
Top: Martin Landriau
Bottom left: John Della Costa
Bottom right: Alejandro Aviles
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The trailer for DESI’s very own planetarium film created by
@ClaireLamman
and
@fiskeplanet
is out! Watch a sunset on Kitt Peak, be an ant inside the forest of robots, and soar through our year one data. To be released this March, free to all planetariums.
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"The last night was clear and calm and dark." --
@rblum5
It was our LAST NIGHT of imaging, leading to the completion of the DESI imaging Legacy Surveys✨🔭
🎉 Huge congrats to the imaging teams! 🎉
See our very last image below.
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Today marks a major milestone with the installation of the sixth spectrograph at Kitt Peak, which is the min acceptable configuration. Four more to go!
Pics: lift of the sixth & now nearly endless sea of spectrographs & cryostats in two rows (top & bottom) of the rack - M. Levi
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PROGRESS: Here's the DESI focal plane with 7 of the 10 petals installed. You are looking at the input end of 3,500 positioners!
📷 by Robert Besuner
More info: In the foreground is one of the guiders. The red wedges are panels where the next petals will be inserted.
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“Your reward will be the widening of the horizon as you climb. And if you achieve that reward, you will ask no other.”
-Prof Cecilia H. Payne-Gaposchkin, first female PhD recipient at Harvard-Radcliffe, first to discover that the universe’s most abundant element is hydrogen 1/5
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Over the next few years, DESI will measure the distance of 15+ million faint galaxies (ELGs)💫
Check out DESI’s latest blog post to know more about the Oxygen Doublet, and its use to hunt those distant ELGs!
Video Credit:
@desisurvey
collab., Julien Guy
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Happy to announce that the captivating view from
@KittPeakNatObs
, as photographed by DESI scientist & observer Satya Gontcho A Gontcho, has reached the finals of this magnificent photo competition! 🏆 Please vote for her stunning photo at
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NEW MILESTONE: the DESI Corrector is now complete! 🥳
"The corrector is designed to provide a larger field of view to the focal plate, allowing 5,000 fibers to be arranged over 8 square degrees."
Learn more here:
#progress
#science
#darkEnergy
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Snapshot from some of our team members this night 🔭
Amy Robertson (Telescope Operator), Satya Gontcho A Gontcho (Lead Observing Scientist), Antonella Palmese (Observer).... 📸 Shadab Alam
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We’re excited to share DESI High” with you !
DESI High is an introduction to the DESI survey and its science with hot-off-the-telescope data. Learn all about Dark Energy, Python and Data Science by clicking
Join us now
@BayAreaSciFest
!
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Beautiful timelapse made by Rongpu Zhou (
@PhyAstro_Pitt
) while observing for the DESI imaging Legacy Surveys at the Blanco telescope
@NOAOSouth
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The final part of Survey Validation, that we are currently undertaking, is what we call "the One Percent Survey".
What science lies behind this cool name ? Find out by reading this blog post !
#DESI5000
#DarkEnergy
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We are excited to get back to taking data! 🤩 Many thanks to the Kitt Peak staff for making this happen!
The Nicholas U. Mayall 4-meter Telescope and the
@desisurvey
instrument both appear to be functioning as expected at the present time. (3/4)
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Paper day! Congrats to DESI member
@ClaireLamman
for this important step towards Precision Cosmology with DESI! To learn more about the subtleties when extracting cosmological information from our galaxy maps, have a look at
@ClaireLamman
's amazing thread ⬇️
My paper is out today!!
To make our science accessible, I tried something new and scribbled
@xkcd
-ish notes over it:
I’m excited to see what y'all think of this idea
Full paper:
Thread about untangling the universe starts here 🧵
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What a pleasure to premiere our brand-new planetarium film “5000 Eyes: Mapping the Universe with DESI” inside the wonderful dome of
@ChabotSpace
. (1/4)
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Our progress throughout this prosperous year of main survey operation is summarized in this excellent blog article by project scientist David Schlegel, go check it out! 👀 A thread (1/5)
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Would you like to know more about the universe,
#DarkEnergy
, and how to unravel its mystery using DESI data? Join us this
#February11
and register to meet DESI experts and celebrate with us the International Day of Women and Girls in Science!
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@desisurvey
Scientist Thought of the Day.
#WomenInScience
series...
... will you be the next to join us ?
#DESI5000
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We are back on track! 🔭 Check out this phenomenal article about these past 3 months ⬇️ We are eternally grateful to the firefighters for saving the site!
Congratulations
@DESIsurvey
!
🔭👀 After a three-month hiatus weathering a fire, monsoons, and mudslides, the
#DarkEnergy
Spectroscopic Instrument has eyes on the night skies again.
@BerkeleyLabPSA
@LBNLphysics
@UCBerkeley
@KittPeakNatObs
@NOIRLabAstro
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✨ We just launched our new DESI website: ✨
Many thanks to the several team members who worked hard to make it happen. We'll keep adding updates as we get ready to go on the sky!
#astronomy
#darkEnergy
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9
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🔭 Exciting Discovery Alert! 🌌 The results of our ongoing secondary-target program led by Dr. Vicky Fawcett unveiling a dusty blow-out phase in Red QSOs have been published!
Many thanks
@astro_fawcett
for this great and inspiring work showcasing the power of DESI! Congrats! 🎉
Hidden supermassive black holes reveal their secrets through radio signals in a paper by Fawcett et al recently published in
#MNRAS
, which presents evidence for a dusty blow-out phase in red QSOs.
@astro_fawcett
@desisurvey
@AstroObsNCL
@DarkerMatters
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Fun Fact: On the night of Feb 12th alone, we acquired a whopping 200k spectra – another record! Yes, this means that in a single night, DESI observes as many spectra as full 5-year galaxy surveys two decades ago. 💫 4/5
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Beautiful lunar eclipse as seen by our all-sky camera! Kudos to tonight's lead observer
@Dr_Luke_Tyas
👏🙏
#DESI5000
#lunareclipse2022
A 3.5 hour timelapse all sky view of November 8th 2022 total lunar eclipse from
@NOIRLabAstro
’s
@KittPeakNatObs
at
@desisurvey
…
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✨With our latest DESI imaging data release (DR8) -- which includes over 1.6 billion galaxies, quasars, and stars -- we launched a public viewer to browse the sky!
✨🔭
Have fun exploring at
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To celebrate
#IDWGS
, here is a compilation of brilliant
#WomenInAstronomy
from multiple projects in the Multimessenger Diversity Network, that DESI is part of.
Credits: MDN,
Clip 1/3
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Have you had a chance to look at the Siena Galaxy Atlas (SGA) yet ?!
SGA is a multiwavelength atlas of 383,620 nearby galaxies selected based on their apparent angular diameter.
Learn more at
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7
20
Finally back on utility power! 🔌⚡️We are indebted to the Kitt Peak team that made it possible to observe this last month with generators and backup generators (and 2nd backup ... etc.). We owe you a million top quality extragalactic spectra✨
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3
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Read our new blogpost/ status update for the scenes behind this Coyote and Roadrunner episode!
In short: there are still some obstacles on the road towards restarting observations 🤯
This does not stop DESI members from working hard (and being creative) 😏
0
9
19
Final (& accepted) version of the DESI imaging Legacy Surveys overview paper is now online.
PI's are
@NOAONorth
's Arjun Dey (MzLS),
@LBNLphysics
's David Schlegel (DECaLS), NAOC's Xu Zhou &
@UofA
's
@xfan_astro
(BASS) together with a lot of team effort!
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10
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Science: "This map of distant galaxies could help untangle the mystery of dark energy"
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6
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Introducing Jahmour Givans, soon-to-be Dr
@osuccapp
@OSUPhysics
! J uses symmetries to model the Universe: "Try this: take some paper & draw a ⬜️. Now rotate it by 90 deg. Notice how it looks the same as before". Learn more & meet J !
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The DOE Project Management Excellence Award now officially arrived. We thank all collaboration members for "exceeding the design requirements ahead of schedule and under budget". We could not be more proud.
#DESI5000
#DarkEnergy
#DOE
#PMEA
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One of two previous
@ENERGY
#EarlyCareer
Award recipients with a DESI stated research focus is Prof. Hee-Jong Seo of Ohio State University – FY18 ! [1/2]
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5 day countdown to
#desihigh
@CambSciFest
! K9-12? Join: to get your hands on hot-off-the-🔭 data. Discover how our Universe began & why its expansion suddenly decided to accelerate with 30 MILLION galaxies! Hack starring
@Harvard
@UCB_Astronomy
@Perimeter
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In celebration of David Weinberg recognition through 2021 Dannie Heineman Prize, read the following DESI blog post to learn more about his many achievements !
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Correct. This DESI image will need to be re-observed in "non-earthquake" conditions 🙃
There was an earthquake in Chile last night while our observer Zack Slepian was using the Dark Energy Camera -- I think we'll have to re-take this image!
@desisurvey
@NOAOSouth
@theDESurvey
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Time to meet a DESI member:
@Namitha46488842
!
“There is nothing more exciting than a dream come true.��
Read the whole interview here:
📸 curtesy of Namitha
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Congratulations to Joan R. Najita for being awarded the 2020 Guggenheim Fellowship !
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Happy New Year!
Wishing you all a healthy, prosperous year 2022.
Eager to continue our skyrocketing journey, full of science records to be broken!
#DESI5000
#DarkEnergy
#DESIgnedByDESI
#DESIskyrocket
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1
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The film "Streetlights of the Universe" about DESI won BEST DOCUMENTARY SHORT at the Sci-on! Film Festival. Congrats to filmmaker
@brynelson
(
@MotherNatureNet
), featured astrophysicists
@rblum5
,
@StephaJuneau
, Peter Behroozi & the DESI team!
See film at:
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@desisurvey
Scientist Thought of the Day.
#WomenInScience
series...
... will you be the next to join us ?
#DESI5000
0
2
17
@desisurvey
Scientist Thought of the Day.
#WomenInScience
series...
... will you be the next to join us ?
#DESI5000
0
4
16
Yet more progress! You can now see all 5000 fiber positioners (robots 🤖) and their electronics.
#darkEnergy
#gettingReady
#science
#milestone
0
9
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Time to re-examine the origin of the cosmic web?
.
.
.
Credits to lead observer Claire Poppett for the sharp eyes at 5am
#DESI5000
#CosmicWeb
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10/📚… and the other one, presents the EDR structure and the available data.
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5/🔬🌌 Here’s a quasar spectrum, with a clearly visible Lyman-α line (transition of e^- in hydrogen from excited to ground state leading to photon emission of wavelength 121.57nm) at 830nm. The universe expansion has shifted this line towards red by a factor 1+z. (Credits: LBNL)
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Time to meet a DESI member: Angela Berti !
Read the whole interview here:
📸 curtesy of Angela Berti
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2
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Many thanks and huge applause to
@ClaireLamman
for creating and directing this fascinating movie about DESI featuring a flight through our year 1 data and much more - it is a masterpiece!
Ya'll, I made a planetarium movie!!
It's about mapping the universe with
@desisurvey
and includes a flight through the real positions of 14 million galaxies. For anyone without access to a planetarium, here's a flat version.
#5000Eyes
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2/🗺️ Our map here displays the sky fraction mapped out during the 3 stages of SV. Notice the orange tiles? They represent the dense "1% Survey" from the previous animation, covering 140 deg^2. Why the patchwork design? Let's find out.
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