Mastodawn

Daniel Fischer Aug 27, 2025

The fast X-ray transient EP240315a - a z ~ 5 gamma-ray burst in a Lyman continuum leaking galaxy: https://arxiv.org/abs/2404.16350 -> 16 months of peer review -> formal publication this month -> Some fast X-ray #transients — quick flashes of energetic radiation — may come from massive stars collapsing and exploding at the same time: https://skyandtelescope.org/astronomy-news/weird-x-ray-flashes-lose-some-of-their-mystery/

The fast X-ray transient EP240315a: a z ~ 5 gamma-ray burst in a Lyman continuum leaking galaxy

The nature of the minute-to-hour long Fast X-ray Transients (FXTs) localised by telescopes such as Chandra, Swift, and XMM-Newton remains mysterious, with numerous models suggested for the events. Here, we report multi-wavelength observations of EP240315a, a 1600 s long transient detected by the Einstein Probe, showing it to have a redshift of z=4.859. We measure a low column density of neutral hydrogen, indicating that the event is embedded in a low-density environment, further supported by direct detection of leaking ionising Lyman-continuum. The observed properties are consistent with EP240315a being a long-duration gamma-ray burst, and these observations support an interpretation in which a significant fraction of the FXT population are lower-luminosity examples of similar events. Such transients are detectable at high redshifts by the Einstein Probe and, in the (near) future, out to even larger distances by SVOM, THESEUS, and Athena, providing samples of events into the epoch of reionisation.

arXiv.org

scinexx - das wissensmagazin Jun 6, 2025

Die stärkste Explosion seit dem Urknall. Astronomen entdecken neue Kategorie kosmischer Mega-Explosionen. #Astronomie #SchwarzeLoecher #Transients #KosmosExplosion #TidalDisruption
https://www.scinexx.de/news/kosmos/die-staerkste-explosion-seit-dem-urknall/

Die stärkste Explosion seit dem Urknall

Kosmische Rekord-Energien: Astronomen haben eine ganz neue Klasse kosmischer Mega-Explosionen entdeckt – sie sind stärker als alles jemals im Weltall

scinexx | Das Wissensmagazin

Spektrum (inoffiziell)Sep 14, 2024

Zwischen 1950 und 2020 verschwanden tausende Sterne. Das VASCO-Projekt erforscht dieses Rätsel durch den Vergleich von Himmelsaufnahmen. 🎙️#Astronomie #Universum #Sternengeschichten #Astrodicticum #Sterne #VASCO #BeatrizVillarroel #VanishingandAppearingSourcesduringaCenturyofObservations #Transients #Stern #Supernova #WeißerZwerg #schwarzesLoch #PalomarObservatorySkySurvey #Pan-STARRSDR2 #GaiaDR3 #Durchmusterung #Asteroid #VeränderlicherStern #Eigenbewegung #Dyson-Sphäre #DunkleSupernova #Unnova #Gravitationslinseneffekt #Kultur #Physik
Sternengeschichten: Verschwundene Sterne

Sternengeschichten: Verschwundene Sterne

Zwischen 1950 und 2020 verschwanden tausende Sterne. Das VASCO-Projekt erforscht dieses Rätsel durch den Vergleich von Himmelsaufnahmen

Ansgar Schmidt

Aug 21, 2024

The Wow! Signal Deciphered. It Was Hydrogen All Along. https://www.universetoday.com/168176/the-wow-signal-deciphered-it-was-hydrogen-all-along/ #astrophysicalmaser #softgammarepeater #technosignatures #hydrogenmaser #transients #wow!signal #astronomy #magnetar #arecibo #seti

The Wow! Signal Deciphered. It Was Hydrogen All Along.

The mysterious Wow! Signal shocked astronomers when it was detected in 1977. Scientists may have finally figure out what it was.

Universe Today

Matt Mar 26, 2024

They’re called transients, Matt

I just spent ten minutes in old code trying to remember what WordPress transients are called.

#php #transients #WordPress

Matze Oct 18, 2023

TIL: While creating a new site in a multisite, you cannot properly work with site transients since wp_installing() returns true and thus only uses the object cache and never checks the database.

So beware if you need to rely on this while not using an object cache.

Workaround: use a site option instead.

#WordPress #Multisite #Transients #ObjectCache #Database #TIL

bad dog Jul 15, 2023

Acoustics researchers decompose sound accurately into its three basic components #SiTraNo #SineWaves #transients #noise #FuzzyLogic https://phys.org/news/2023-07-acoustics-decompose-accurately-basic-components.html

Acoustics researchers decompose sound accurately into its three basic components

Researchers have been looking for ways to decompose sound into its basic ingredients for more than 200 years. In the 1820s, French scientist Joseph Fourier proposed that any signal, including sounds, can be built using a sufficient number of sine waves. These waves sound like whistles, each have their own frequency, level and start time, and are the basic building blocks of sound.

Phys.org