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Resonant scattering at the center of the galaxy cluster PKS 0745-191 with XRISM

Tanaka, Keita [Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan). Institute of Space and Astronautical Science; University of Tokyo (Japan)] (ORCID:0009000177969536)·Eckart, Megan E. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)]·Fukushima, Kotaro [Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan). Institute of Space and Astronautical Science] (ORCID:0000000180557113)·Gu, Liyi [Space Research Organisation Netherlands (SRON), Leiden (Netherlands)]·Matsushita, Kyoko [Tokyo University of Science, Chiba (Japan)] (ORCID:0000000329070902)·McNamara, Brian [University of Waterloo, ON (Canada)]·Mernier, François [NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Université de Toulouse (France); Centre National de la Recherche Scientifique (CNRS), Toulouse (France). Institut de Recherche en Astrophysique et Planétologie (IRAP); Centre National d'Études Spatiales (CNES), Toulouse (France); Université Toulouse III - Paul Sabatier (UT3-UPS) (France); University of Maryland, College Park, MD (United States). Center for Research and Exploration in Space Science & Technology II (CRESST II)]·Mitsuishi, Ikuyuki [Nagoya University (Japan)]·Porter, Frederick S [NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)]·Sato, Kosuke [Kyoto Sangyo University (France)]·Sawada, Makoto [Rikkyo University, Tokyo (France)] (ORCID:0000000320086887)·Suda, Kazunori [Tokyo University of Science, Chiba (Japan)]·Zhuravleva, Irina [University of Chicago, IL (United States)]·Yamasaki, Noriko Y. [Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan). Institute of Space and Astronautical Science; University of Tokyo (Japan)] (ORCID:0000000348855537)
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Abstract

We report evidence of the resonant scattering effect at the center of the galaxy cluster PKS 0745-191 with XRISM. We analyzed XRISM/Resolve commissioning-phase observations of the distant cluster PKS 0745-191 ($z = 0.103$) with a $54$ ks exposure. The gain drift was corrected using the onboard modulated X-ray source (MXS), and spectra were extracted from all the pixels that were well illuminated by MXS, the core region (four central pixels, $\sim$100 kpc), and the surrounding region. A single-temperature collisional ionization equilibrium (CIE) model fits the full field-of-view spectrum with $kT \approx 6$ keV and a turbulent velocity of ${\approx}120$ km s$^{-1}$. From the core ($r < 50$ kpc) spectrum, we detected a ${\approx}22\%$ suppression of the Fe xxv He$\alpha$ resonance (w) line relative to the CIE prediction. We performed a Monte Carlo simulation to calculate the resonant scattering (RS) effect using radial profiles from Chandra data. The RS-inferred turbulence agrees with that by Resolve line-broadening, demonstrating that RS provides an independent and consistent constraint on ICM turbulence. These results highlight XRISM/Resolve’s potential for turbulence studies in galaxy clusters.

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Astronomy and AstroPhysicsX-rays: galaxies: clustersgalaxies: clusters: individual ( PKS 0745-191)galaxies: clusters: intracluster medium

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Tanaka, Keita [Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan). Institute of Space and Astronautical Science; University of Tokyo (Japan)] (ORCID:0009000177969536), Eckart, Megan E. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)], Fukushima, Kotaro [Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan). Institute of Space and Astronautical Science] (ORCID:0000000180557113), Gu, Liyi [Space Research Organisation Netherlands (SRON), Leiden (Netherlands)], Matsushita, Kyoko [Tokyo University of Science, Chiba (Japan)] (ORCID:0000000329070902), McNamara, Brian [University of Waterloo, ON (Canada)], Mernier, François [NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Université de Toulouse (France); Centre National de la Recherche Scientifique (CNRS), Toulouse (France). Institut de Recherche en Astrophysique et Planétologie (IRAP); Centre National d'Études Spatiales (CNES), Toulouse (France); Université Toulouse III - Paul Sabatier (UT3-UPS) (France); University of Maryland, College Park, MD (United States). Center for Research and Exploration in Space Science & Technology II (CRESST II)], Mitsuishi, Ikuyuki [Nagoya University (Japan)], Porter, Frederick S [NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)], Sato, Kosuke [Kyoto Sangyo University (France)], Sawada, Makoto [Rikkyo University, Tokyo (France)] (ORCID:0000000320086887), Suda, Kazunori [Tokyo University of Science, Chiba (Japan)], Zhuravleva, Irina [University of Chicago, IL (United States)], Yamasaki, Noriko Y. [Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan). Institute of Space and Astronautical Science; University of Tokyo (Japan)] (ORCID:0000000348855537). 2026-04-23. Resonant scattering at the center of the galaxy cluster PKS 0745-191 with XRISM. https://doi.org/10.1093/pasj/psag028

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