Create accountLogin

Recent searches

No recent searches

Search options

Only available when logged in.
mathstodon.xyz is one of the many independent Mastodon servers you can use to participate in the fediverse.
A Mastodon instance for maths people. We have LaTeX rendering in the web interface!

Administered by:

Server stats:

3K
active users

mathstodon.xyz: AboutStatusProfiles directoryPrivacy policy

Mastodon: AboutGet the appKeyboard shortcutsView source codev4.3.7

#astro

31 posts24 participants7 posts today
Public
Stephen Sekula

Calling all physical science #researchers! The application process is open for the 2025 SNOLAB Underground Science Institute lecture program. Come to #SNOLAB for the summer, work on your project and/or a project at the lab, and get access to academic training and hands-on workshops. This is aimed at graduate students and postdoctoral researchers.

We will start reviewing applications soon!

fed.brid.gy/r/https://bsky.app

A poster advertising a lecture program
#undergroundscience#physics#chemistry
Public
Rxiv mechanobio

📰 "A kinetic model of jet-corona coupling in accreting black holes"
arxiv.org/abs/2504.01062 #Physics.Plasm-Ph #Astro-Ph.He #Dynamics #Cell

arXiv logo
arXiv.orgA kinetic model of jet-corona coupling in accreting black holesBlack hole (BH) accretion disks are often coupled to ultramagnetized and tenuous plasma coronae close to their central BHs. The coronal magnetic field can exchange energy between the disk and the BH, power X-ray emission, and lead to jetted outflows. Up until now, the coronal physics of BH accretion has only been studied using fluid modeling. We construct the first model of a BH feeding on a zero-net-flux accretion disk corona based on kinetic plasma physics. This allows us to self-consistently capture how collisionless relativistic magnetic reconnection regulates the coronal dynamics. We present global, axisymmetric, general relativistic particle-in-cell simulation of a BH coupled, via a series of magnetic loops, to a razor-thin accretion disk. We target the jet-launching regime where the loops are much larger than the BH. We ray-trace high-energy synchrotron lightcurves and track the flow of Poynting flux through the system, including along specific field-line bundles. Reconnection on field lines coupling the BH to the disk dominates the synchrotron output, regulates the flux threading the BH, and ultimately untethers magnetic loops from the disk, ejecting them via a magnetically striped Blandford-Znajek jet. The jet is initially Poynting-dominated, but reconnection operates at all radii, depleting the Poynting power logarithmically in radius. Coronal emission and jet launch are linked through reconnection in our model. This link might explain coincident X-ray flaring and radio-jet ejections observed during hard-to-soft X-ray binary state transitions. It also suggests that striped jet launch could be heralded by a bright coronal counterpart. Our synchrotron signatures resemble variability observed from the peculiar changing-look AGN, 1ES 1927+654, and from Sagittarius A*, hinting that processes similar to our model may be at work in these contexts.
SearchLive feeds
About