The central regions of three Seyfert galaxies exhibit diverse polycyclic aromatic hydrocarbon (PAH) characteristics, which are associated with different underlying feedback mechanisms, including radiative and kinetic effects from the active galactic nuclei.
The observations reveal significant variability in the emission of the H12CN(3-2) line confined to the very close neighborhood of the S-type AGB star χ Cygni, as well as evidence for a recent mass ejection event enhanced over the red-shifted north-western octant of the circumstellar envelope.
We do not detect a statistically significant gamma-ray signal (> 3σ) from the galaxy cluster SPT-CL J2012-5649 using six years of DAMPE data, but obtain 95% C.L. upper limits on the energy flux ranging between ~10^-6 and 10^-4 MeV cm^-2 s^-1 in the energy range from 3 GeV to 1 TeV.
The Large High Altitude Air Shower Observatory (LHAASO) has the potential to detect or place strong constraints on the local burst rate density of primordial black holes through the observation of their Hawking radiation.
Intermediate-separation main-sequence + white dwarf binaries from Gaia show distinct domains of enhanced s-process element abundances that depend on the white dwarf mass and metallicity, consistent with parameter spaces identified in previous asymptotic giant branch nucleosynthesis studies.
我們發現了一顆位於 z = 2.83 的相對論性脫氫包殼型 Ic-BL 超新星。這是迄今發現的最高紅移 SESN。其光度曲線和光譜特徵與其他低紅移 Ic-BL 超新星相似,表明其可能來自低金屬豐度環境。
The accretion structure around supermassive black holes transitions from a disc-dominated state to an X-ray plasma-dominated state as the mass accretion rate decreases below ~2% of the Eddington limit.
JWST観測により、z = 2.83の相対論的剥離包皮型 Ic-BL 型超新星が発見された。この超新星は非常に高い輝度を示し、低金属量の環境に位置していることが明らかになった。
A rare, broad-lined Type Ic supernova (SN Ic-BL) was discovered at redshift z = 2.83 using the James Webb Space Telescope, representing the highest-redshift stripped-envelope supernova ever detected.
The extremely low X-ray luminosity and surface temperature of the young pulsar PSR J0837-2454 suggest it has a high enough mass to allow for fast neutrino emission from direct Urca reactions in its core, providing crucial constraints on the nuclear equation of state of neutron stars.