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Disentangling Multiple Gas Kinematic Drivers in the Perseus Galaxy Cluster
XRISM Collaboration, Marc Audard, Hisamitsu Awaki, Ralf Ballhausen, Aya Bamba, Ehud Behar, Rozenn Boissay-Malaquin, Laura Brenneman, Gregory V. Brown, Lia Corrales, Elisa Costantini, Renata Cumbee, Maria Diaz Trigo, Chris Done, Tadayasu Dotani, Ken Ebisawa, Megan E. Eckart, Dominique Eckert, Satoshi Eguchi, Teruaki Enoto, Yuichiro Ezoe, Adam Foster, Ryuichi Fujimoto, Yutaka Fujita, Yasushi Fukazawa, Kotaro Fukus…

Disentangling Multiple Gas Kinematic Drivers in the Perseus Galaxy Cluster
Galaxy clusters, the Universe's largest halo structures, are filled with 10-100 million degree X-ray-emitting gas. Their evolution is shaped by energetic processes such as feedback from supermassive black holes (SMBHs) and mergers with other cosmic structures. The imprints of these processes on gas kinematic properties remain largely unknown, restricting our understanding of gas thermodynamics and energy conversion within clusters. High-resolution spectral mapping across a broad spatial-scale r…

Tertiary Tides with Eccentric Orbits
Yan Gao, Tjarda Boekholt, Devismita Panda, Tatsuya Akiba, Silvia Toonen
https://arxiv.org/abs/2509.01672 https://arxiv…

Tertiary Tides with Eccentric Orbits
Within hierarchical triple stellar systems, there exists a tidal process unique to them, known as tertiary tides. In this process, the tidal deformation of a tertiary in a hierarchical triple drains energy from the inner binary, causing the inner binary's orbit to shrink. Previous work has uncovered the rate at which tertiary tides drain energy from inner binaries, as a function of orbital and tidal parameters, for hierarchical triples in which the orbits are all circular and coplanar. However,…

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First-principles response simulation of wide-gap CdTe-DSDs for the FOXSI solar sounding rocket experiment
Shunsaku Nagasawa, Takahiro Minami, Tadayuki Takahashi, Shin Watanabe
https://arxiv.org/abs/2509.00738

First-principles response simulation of wide-gap CdTe-DSDs for the FOXSI solar sounding rocket experiment
We have developed a wide-gap CdTe double-sided strip detector (CdTe-DSD) for the fourth and fifth flights of the Focusing Optics X-ray Solar Imager sounding rocket experiment (FOXSI-4/FOXSI-5). This detector features a 30 um strip width and a variable gap width from 30 um to 70 um, enabling position resolution finer than the strip pitch by inducing charge sharing across adjacent strip electrodes and utilizing this shared energy information for position reconstruction. However, this wide-gap con…

Impact of projection-induced optical selection bias on the weak lensing mass calibration of galaxy clusters
Titus Nyarko Nde, Hao-Yi Wu, Shulei Cao, Gladys Muthoni Kamau, Andrius Tamosiunas, Chun-Hao To, Conghao Zhou
https://arxiv.org/abs/2510.00753

Impact of projection-induced optical selection bias on the weak lensing mass calibration of galaxy clusters
Weak gravitational lensing signals of optically identified clusters are impacted by a selection bias -- halo triaxiality and large-scale structure along the line of sight simultaneously boost the lensing signal and richness (the inferred number of galaxies associated with a cluster). As a result, a cluster sample selected by richness has a mean lensing signal higher than expected from its mean mass, and the inferred mass will be biased high. This selection bias is currently limiting the accurac…

Die ePetition 183872 an den Bundestag aus dem Bereich Streckenführung mit dem Titel
Zügige Umsetzung des Baus der ICE-Neubaustrecke zwischen Hamburg und Hannover
kann bis zum Dienstag 30. September 2025 01:00 UTC mitgezeichnet werden und lautet
Wir, die Unterzeichnenden, sprechen uns ausdrücklic…

Quasi-Periodic Eruptions as a Probe of Accretion Disk in Tidal Disruption Events
Tomoya Suzuguchi, Tatsuya Matsumoto
https://arxiv.org/abs/2509.01663 https://

Quasi-Periodic Eruptions as a Probe of Accretion Disk in Tidal Disruption Events
Quasi-periodic eruptions (QPEs) are X-ray transients characterized by nearly regular recurring flares from galactic nuclei. Recent observations have confirmed that some QPEs occur in galactic centers that experienced a tidal disruption event (TDE) a few years earlier. This may be reasonably explained if QPEs are produced when a star orbiting a supermassive black hole passes through an accretion disk formed by the TDE. Based on this scenario, we investigate the expected QPE signatures in the ear…

Signal processing and data acquisition system for the BTO detectors onboard COSI
Shunsaku Nagasawa, Tadayuki Takahashi, Kazuhiro Nakazawa, Hannah Gulick, Claire Chen, Hiroki Yoneda, Keigo Okuma, Matt Dexter, Josh Forgione, Nihal Gulati, Andrew Ji, Kaylie Ching, Isabel Schmidtke, Sarah Jauregui, Eric Yang, Andreas Zoglauer, Juan Carlos Martinez Oliveros, John Tomsick

Signal processing and data acquisition system for the BTO detectors onboard COSI
The energy range from a few hundred keV to a few MeV includes important probes such as nuclear gamma-rays and the 511 keV annihilation line. However, compared to X-rays and GeV/TeV gamma-rays, this range suffers from lower sensitivity by orders of magnitude. The upcoming NASA SMEX satellite mission Compton Spectrometer and Imager (COSI), scheduled for launch in 2027, is expected to break through this limitation with its Compton telescope utilizing a germanium semiconductor detector, covering th…