Equation-of-state-informed pulse profile modeling NICER observations of x-ray pulsars can put constraints on the mass and radius of neutron stars which constrain the nuclear equation of state. However, modeling the pulse profile as a function of mass...

Very nice to see this paper, on dense matter Equation of State informed pulse profile modelling of neutron stars - led by Mariska Hoogkamer and Nathan Rutherford - published as an Editors' Suggestion in Physical Review D. #highenergyastro 🔭⚛️🧪

journals.aps.org/prd/abstract...

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Looking for a postdoc in radio astronomy? We have an opportunity at @herts.ac.uk. Please share with anybody interested.

Extreme Radio Flares from Young Stellar Objects (closing date: 2026-04-16)

Apply here: ce0997li.webitrent.com/ce0997li_web...

🔭 #RadioAstronomy #highenergyastro #stellarastro

A NICER View of PSR J0030+0451: Updated Constraints from Six Years of NICER Observations Pulse-profile modeling of rotation-powered millisecond pulsars targeted by NICER has enabled mass--radius constraints of several neutron star sources, with implications for the dense-matter equation o...

New NICER neutron star results this morning, led by Yves Kini! For the first rotation-powered millisecond pulsar we ever reported on, PSR J0030+0451.

More data (6 years!), background constraints fully incorporated, and improved sampling. #highenergyastro 🔭🧪

arxiv.org/abs/2602.23743

Journal of Astrophysics and Astronomy

🔭 This study from 'Journal of Astrophysics and Astronomy' evaluates the performance of various machine-learning regression models to improve parameter extraction and foreground removal. bit.ly/4qWSQgi #HighEnergyAstro #ML

Pioneer of Galactic Astronomy: A Biography of Jacobus C. Kapteyn

🔭 'Pioneer of Galactic Astronomy: A Biography of Jacobus C. Kapteyn'—A fascinating biography of Jacobus C. Kapteyn, who pioneered the study of the structure of the Milky Way, culminating a century later with the GAIA satellite. bit.ly/3Nv7QDh #highenergyastro #booksky

In Other Journals Editors’ selections from the current scientific literature

Editor's choice: Neights et al. have observed a gamma-ray burst that lasted 7 hours. They argue it arose from a black hole merging with a helium star. ☄️🔭 #highenergyastro #stellarastro
www.science.org/doi/10.1126/...

Neutron stars and the dense matter equation of state Neutron stars, the remnants of supernova explosions, are the densest objects in the Universe. A typical neutron star has a mass between one and two solar masses, and a radius of around 12 km. The dens...

Sneaking in at the end of 2025, our Reviews of Modern Physics article on 'Neutron stars and the dense matter equation of state' is finally published! #highenergyastro 🔭⚛️

journals.aps.org/rmp/abstract...

Le désert d'Atacama devient le théâtre de la plus grande chasse aux rayons gamma de l'histoire À Paranal, dans l’Atacama, le Chili lance la construction du CTAO, futur plus grand observatoire de rayons gamma, pour sonder l’Univers extrême.

Le CTAO au Chili devient le plus grand observatoire de rayons gamma, prêt à révéler les secrets les plus explosifs de l’univers. www.aquitaineonline.com/actu-news/in... #Space #Science #Innovation #Astrophysics #GammaRays #CTAO #HighEnergyAstro

#highenergyastro #pulsars 🔭

Understanding pulsar magnetospheres with the SKAO The SKA telescopes will bring unparalleled sensitivity across a broad radio band, a wide field of view across the Southern sky, and the capacity for sub-arraying, all of which make them the ideal inst...

And for those thinking "But what about magnetic fields? Specifically, pulsar magnetospheres?!" Here you go! Wish granted! #highenergyastro 🔭

arxiv.org/abs/2512.16157

Probing neutron star interiors and the properties of cold ultra-dense matter with the SKAO Matter inside neutron stars is compressed to densities several times greater than nuclear saturation density, while maintaining low temperatures and large asymmetries between neutrons and protons. Neu...

If you want to know "what will the SKA do for our understanding of the dense matter EOS?", look no further! #highenergyastro 🔭

arxiv.org/abs/2512.16162

Pulsar Science with the SKA Observatory The large instantaneous sensitivity, a wide frequency coverage and flexible observation modes with large number of beams in the sky are the main features of the SKA observatory's two telescopes, the S...

Loads of Square Kilometer Array pulsar goodness on the arXiv this morning!! #highenergyastro 🔭 For an overview of all of the papers see here:

arxiv.org/abs/2512.16152

Publications arXiv preprint  ​ https://doi.org/10.48550/arXiv.2512.01638​ December 1, 2025 ​ Using 14 years of data from the Telescope Array in Utah, this study searched for ultrahigh-energy photons...

I have been alive for 15,353 days today. I have reached the # of Life, the Universe, and Everything.

My birthday wish is that a) you do something kind today, b) read, skim, or share something I wrote for science, and c) do a little jig. 🧪⚛️ #highenergyastro

www.jamiezvirzdin.com/publications...

🧪☄️🔭 #highenergyastro

Pulse profile modelling of the accretion-powered millisecond pulsar SAX J1808.4-3658 using NICER data from its 2019 and 2022 outbursts Pulse profile modelling is a relativistic ray-tracing technique that has provided constraints on parameters, with a focus on mass and radius, of five rotation-powered millisecond pulsars. While the te...

New paper! Led by PhD student Bas Dorsman, and continuing the fine tradition of @api.uva.nl studies of the accreting millisecond pulsar SAX J1808.4-3658 (discovered many moons ago by Rudy Wijnands and Michel van der Klis AT THIS VERY INSTITUTE). #highenergyastro 🔭

arxiv.org/abs/2511.07152

Equation-of-state-informed pulse profile modeling NICER has enabled mass-radius inferences for pulsars using pulse profile modeling, providing constraints on the equation of state (EOS) of cold, dense matter. To date, PPM and EOS inference have been ...

New paper 🚨! "Equation of state informed pulse profile modelling", led jointly by @api.uva.nl PhD student Mariska Hoogkamer and UNH's Nathan Rutherford. A project with some unexpected twists .... 🔭 #highenergyastro 🧵1/

arxiv.org/abs/2510.27619

Dense matter in neutron stars with eXTP In this white paper, we present the potential of the enhanced X-ray timing and polarimetry (eXTP) mission to constrain the equation of state of dense matter in neutron stars, exploring regimes not dir...

The eXTP dense matter white paper is published! eXTP is going to be a great telescope for e.g. pulse profile modeling of both rotation-powered and accretion-powered millisecond pulsars. Launching in 2030! #highenergyastro 🔭 #densematter #neutronstars

ui.adsabs.harvard.edu/abs/2025SCPM...

Fermi-GBM Team Analysis on The Ravasio Line The prompt spectra of gamma-ray bursts are known to follow broadband continuum behavior over decades in energy. GRB 221009A, given the moniker the brightest of all time (BOAT), is the brightest gamma-...

An amusing footnote in a preprint:
"for brevity, we refer to this as the Ravasio Line, following the established tradition in our field [gamma-ray bursts] of naming things after Italians."
☄️ #HighEnergyAstro
arxiv.org/abs/2410.00286

Astronomers spot mysterious gamma-ray explosion, unlike any detected before! 💥

Our VLT revealed that its source lies outside our galaxy. Yet its cause is still unknown 🤔 Read more: https://www.eso.org/public/news/eso2514/

🔭 🧪 ☄️
#extragalactic
#highenergyastro

Psst . . . Your AI Is Showing: How to Put Your Own Voice in Scientific Papers AI tools shape writing style in ways that dull clarity, variety, rhythm, and voice. Editors, publishers, grant-givers, and professors are familiar with—and tired of—the linguistic tics of the AI voice...

I am citable! Check it out:

Zvirzdin, J. (2025, January 27). Psst . . . Your AI Is Showing: How to Put Your Own Voice in Scientific Papers. Workshop on Machine Learning for Analysis of High-Energy Cosmic Particles, University of Delaware. doi.org/10.5281/zeno...

#highenergyastro #ai ⚛️🧪

Time‐Resolved Leader Spectra of Downward Terrestrial Gamma‐Ray Flashes Observed at the Telescope Array Surface Detector Time-resolved leader spectra associated with two downward Terrestrial Gamma-ray Flashes (TGFs)–a low peak current and a high peak current event–are presented The high-peak-current event exhibits ...

We just published our second paper on this topic! Our #TelescopeArray detectors help us understand energy mechanisms behind both cosmic rays 🌠and lightning.🌩️ Support your local scientists and the National Science Foundation! 💞💸

agupubs.onlinelibrary.wiley.com/doi/10.1029/...

#highenergyastro 🧪⚛️

One more paper from the group out arxiv.org/abs/2508.00062 🎉 Led by Lieke Sippens Groenewegen, who finished her MSc in my group @grappainstitute.bsky.social in February, and with @sanjanacurtis.bsky.social we developed an end-to-end pipeline for kilonova lightcurves and spectra #highenergyastro 🔭🧪

Satellite image of fire in Sevier County, Utah.

I remotely operate sensitive cosmic-ray telescopes in the West Desert of Utah. Wild that we can pick up the light from this wildfire. Be safe, Sevier County!

Select Band="Fire Temperature RGB"
www.star.nesdis.noaa.gov/goes/wfo_ban...

#Utah #UofU #TelescopeArray #highenergyastro 🧪

Blue, purple, red, orange-colored images of the field of Type Ic-BL SN, PTF10tqv. On the left is a SDSS image of the host galaxy; in the middle, VLA 10 GHz imaging showing a detection at 3626 days post-peak; and on the right, MeerKAT imaging showing a detection at 5296 days post-peak.

@genevieveschroeder.bsky.social (Cornell) et al. present late-time radio imaging of a sample of SNe Ic-BL. In the images here, at the optical location (left) of SN PTF10tqv, they detect very late-time (> 10 years !!!) emission with the VLA (middle) and MeerKAT (right).

🧪🔭☄️👩‍🔬 #highenergyastro

To understand physics, we need to tell – and hear – stories | Aeon Essays Don’t be intimidated by physics: it is made of stories and metaphors. Learn these and the field will open up to you

Scientists can regain public trust by a) being honest in their work and b) not being so proudly inaccessible in their writing. The best physics writing uses different kinds of stories, and I also tell my own.

aeon.co/essays/to-un...
@aeon.co #scicomm #writing #editing #publishing #highenergyastro ⚛️

If you research the physics ⚛️ of extreme objects/particles/environments or high/ultrahigh-energy emissions from space, sign up to post to our #Bluesky #highenergyastro feed.

I moderate this feed as part of the most excellent Astrosky Ecosystem.🔭
Join us!🧪
astrosky.eco/feeds/highen...
@emily.space

Fun visit to the @einsteintelescope.bsky.social pathfinder at @maastrichtu.bsky.social yesterday with my research group. Really cool developments in the making, thanks very much for the great tour! #highenergyastro

Katja Pottschmidt

Rest in peace Katja Pottschmidt - a fantastic X-ray astronomer, gone far too soon. #highenergyastro 🔭

heasarc.gsfc.nasa.gov/docs/katja-p...

A Black Hole is Born: 3D GRMHD Simulation of Black Hole Formation from Core-Collapse We present the first three-dimensional, fully general-relativistic magnetohydrodynamic (3D GRMHD) simulation of a black hole (BH) formed from the collapsed core of a massive star. The ability to self-...

And one more paper just out today 🎉 The first 3D GRMHD simulation of black-hole formation in massive stellar core collapse in arxiv.org/abs/2506.20837. #highenergyastro 🔭🧪

#highenergyastro 🔭🧪