Tootfinder

XRISM Observation of the Ophiuchus Galaxy Cluster: Quiescent Velocity Structure in the Dynamically Disturbed Core
Yutaka Fujita, Kotaro Fukushima, Kosuke Sato, Yasushi Fukazawa, Marie Kondo
https://arxiv.org/abs/2507.00126

XRISM Observation of the Ophiuchus Galaxy Cluster: Quiescent Velocity Structure in the Dynamically Disturbed Core
We present the high-resolution X-ray spectroscopic observations of the Ophiuchus galaxy cluster core using the XRISM satellite. Despite previous observations revealing multiple cold fronts and dynamical disturbances in the cluster core, our XRISM observations show low gas velocity dispersions of σ_v = 115 +/- 7 km s^{-1} in the inner region (~< 25 kpc) and σ_v = 186 +/- 9 km s^{-1} in the outer region (~ 25-50 kpc). The gas temperatures are kT = 5.5 +/- 0.2 keV and 8.4 +/- 0.2 keV for the inn…

Explosive Dispersal Outflows as a New Class of Fermi Gamma-Ray Sources: The Case of DR21
Paarmita Pandey, Stephen C. Lenker II, Laura A. Lopez, Anna L. Rosen, Tim Linden, Todd A. Thompson, Stella S. R. Offner, Katie Auchettl, Christopher M. Hirata
https://arxiv.org/abs/2509.02679

Explosive Dispersal Outflows as a New Class of Fermi Gamma-Ray Sources: The Case of DR21
We report the first detection of gamma-ray emission from an explosive dispersal outflow in the Milky Way, revealing a new source class of high-energy emission. Using 15 years of Fermi-LAT data in the 0.2 $-$ 500 GeV range, we detect a significant ($ > 35σ$) $γ$-ray emission spatially coincident with the DR21 outflow, located at a distance of 1.5 kpc in the Cygnus-X star-forming region. The spectrum follows a power-law plus an exponential cutoff model with a spectral index $Γ= 2.08\pm0.02$ an…