Black hole astrophysicist and blues guitarist | @CenterForAstro, @ehtelescope | 🇳🇱 🇺🇸 🏳️🌈
Somerville, MA
Joined August 2015
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Freek Roelofs retweeted
Breaking news: the Event Horizon Telescope team unveils strong magnetic fields spiraling at the edge of Milky Way’s central black hole, Sagittarius A*. This new image suggests that strong magnetic fields may be common to all black holes.
#OurBlackHole #SgrABlackHole
Press release about our discovery of circular polarization at the event horizon of the supermassive black hole in M87!
cfa.harvard.edu/news/superma…
Freek Roelofs retweeted
Many @ehtelescope postdocs and junior staffs shared the exciting frontier of EHT science and technology! In our session, Lindy Blackburn and Iniyan Natarajan from @saoastro gave fantastic talks on EHT data processing and new software in @JuliaLanguage. #URSIGASS2023
Freek Roelofs retweeted
In the VLBI session, @ehtelescope highjacked an hour of the block! Kotaro Moriyama gave an excellent overview of EHT results, @froeloefs shared the latest EHT results studying magnetism at the edge of the event horizon of #M87BlackHole with circular polarization. #URSIGASS2023
Freek Roelofs retweeted
So happy this paper is finally out! @Noemi_La_Bella did a great job investigating the impact of the AMT when we observe Sagittarius A* with the EHT. It turns out it helps a lot when observing with our European partners and ALMA
Making movies of black holes? Sure! Building a telescope like the @africa_mm_tel greatly helps.
Latest paper by my group: „Expanding Sgr A* dynamical imaging capabilities with an African extension to the Event Horizon Telescope“ @Noemi_La_Bella et al.
arxiv.org/abs/2301.11384
Freek Roelofs retweeted
Partial group reunion @Radboud_Uni of former PhD students with the legendary Einstein fellow @SaraIssaoun as colloquium speaker in the center, dr binary black hole shadow ballet @jordydavelaar, blueshifted simulator @froeloefs, space faring lunatic @CDBrinkerink and a crazy prof.
Freek Roelofs retweeted
The 2022 @harvardbhi conference ended and our first instinct was to go get Union Square donuts 😎🍩
#EventHorizonTelescope
Freek Roelofs retweeted
We finally have the first look at our Milky Way black hole, Sagittarius A*. It’s the dawn of a new era of black hole physics. Credit: EHT Collaboration. #OurBlackHole #SgrABlackHole
Link: eventhorizontelescope.org/bl…
Freek Roelofs retweeted
We, at the Event Horizon Telescope, will be revealing groundbreaking Milky Way results on May 12, across multiple press conferences worldwide including at the @NSF and @ESO
Read more here: eso.org/public/announcements…
Freek Roelofs retweeted
Tonight we will start the EHT 2022 observing campaign, targeting our favorite black holes with 11 stations around the world! 📡🌍📡
Image compilation by Thalia Traianou. #EHT2022
Freek Roelofs retweeted
The NSBP/SAO EHT Scholars Program is seeking undergrad/grad student applications for its 2022 cohort! The application deadline is April 1st, for an internship on black hole research starting in June 2022. Come join us!
@NSBPInc @saoastro @CenterForAstro
Freek Roelofs retweeted
Looking for talented researchers for a postdoctoral fellowship in the Event Horizon Telescope (EHT) and next-generation EHT (ngEHT) projects. Software inclined astrophysicists encouraged to apply! jobregister.aas.org/ad/69b35…
Freek Roelofs retweeted
Exciting times, our new NatAstro paper is out of embargo revealing the first @ehtelescope view of the nearest radio galaxy Centaurus A! We see 'hollow' looking jets launched by a #BlackHole! Led by then PhD student Michael Janssen, it's both impressive and super weird. [1/5]
Freek Roelofs retweeted
Don't miss out this fantastic documentary by Peter Galison. It explores the struggles of the @ehtelescope to capture the iconic first image of a black hole. You'll get a behind-the-scenes look at our collaboration & meet many of us👇
netflix.com/title/81343342
Freek Roelofs retweeted
Two technical papers describing our Event Horizon Imager #EHI concept to image black holes from space (and how to fit a telescope larger than Earth into one Ariane 6 rocket @esa @Arianespace @AirbusSpace).
arxiv.org/abs/2105.06882
arxiv.org/abs/2105.06901
Freek Roelofs retweeted
One ring to bind them all! Very excited to announce our new reveal of the connection between the iconic @ehtelescope image of the #BlackHole in M87 and the enormous jets it launches, captured in multiwavelength glory during our 2017 campaign.
Hats off to all observers and technical staff who are making this happen with limited physical access to the observatories! Very curious to see what we get this time...
We have a “go” for our first observing night of @ehtelescope since 2018. Weather is not optimal everywhere, but we will get some highly needed fresh data.😊
We have a new paper out showing how well we could measure black holes in the future! Just with more EHT observations, we could get several times better mass measurements. With space telescopes, we could get 0.5% precision and constrain black hole spin.
➡️arxiv.org/abs/2103.16736
The right image above shows the distribution over black hole spin of the models that are acceptable after fitting to the simulated data from different arrays. When we observe with submillimeter telescopes in orbit around Earth (EHI), the black hole spin starts to be constrained.