2025ApJ...994L..28X

Query : 2025ApJ...994L..28X

2025ApJ...994L..28X - Astrophys. J., 994, L28 (2025/November-3)

XRISM Constraints on Unidentified X-Ray Emission Lines, Including the 3.5 keV Line, in the Stacked Spectrum of 10 Galaxy Clusters.

XRISM COLLABORATION, AUDARD M., AWAKI H., BALLHAUSEN R., BAMBA A., BEHAR E., BOISSAY-MALAQUIN R., BRENNEMAN L., BROWN G.V., CORRALES L., COSTANTINI E., CUMBEE R., DIAZ TRIGO M., DONE C., DOTANI T., EBISAWA K., ECKART M.E., ECKERT D., EGUCHI S., ENOTO T., EZOE Y., FOSTER A., FUJIMOTO R., FUJITA Y., FUKAZAWA Y., FUKUSHIMA K., FURUZAWA A., GALLO L., GARCIA J.A., GU L., GUAINAZZI M., HAGINO K., HAMAGUCHI K., HATSUKADE I., HAYASHI K., HAYASHI T., HELL N., HODGES-KLUCK E., HORNSCHEMEIER A., ICHINOHE Y., ISHI D., ISHIDA M., ISHIKAWA K., ISHISAKI Y., KAASTRA J., KALLMAN T., KARA E., KATSUDA S., KANEMARU Y., KELLEY R., KILBOURNE C., KITAMOTO S., KOBAYASHI S., KOHMURA T., KUBOTA A., LEUTENEGGER M., LOEWENSTEIN M., MAEDA Y., MARKEVITCH M., MATSUMOTO H., MATSUSHITA K., McCAMMON D., McNAMARA B., MERNIER F., MILLER E.D., MILLER J.M., MITSUISHI I., MIZUMOTO M., MIZUNO T., MORI K., MUKAI K., MURAKAMI H., MUSHOTZKY R., NAKAJIMA H., NAKAZAWA K., NESS J.-U., NOBUKAWA K., NOBUKAWA M., NODA H., ODAKA H., OGAWA S., OGORZALEK A., OKAJIMA T., OTA N., PALTANI S., PETRE R., PLUCINSKY P., PORTER F.S., POTTSCHMIDT K., SATO K., SATO T., SAWADA M., SETA H., SHIDATSU M., SIMIONESCU A., SMITH R., SUZUKI H., SZYMKOWIAK A., TAKAHASHI H., TAKEO M., TAMAGAWA T., TAMURA K., TANAKA T., TANIMOTO A., TASHIRO M., TERADA Y., TERASHIMA Y., TSUBOI Y., TSUJIMOTO M., TSUNEMI H., TSURU T., TUMER A., UCHIDA H., UCHIDA N., UCHIDA Y., UCHIYAMA H., UEDA S., UEDA Y., UNO S., VINK J., WATANABE S., WILLIAMS B.J., YAMADA S., YAMADA S., YAMAGUCHI H., YAMAOKA K., YAMASAKI N., YAMAUCHI M., YAMAUCHI S., YAQOOB T., YONEYAMA T., YOSHIDA T., YUKITA M., ZHURAVLEVA I., BREUER J.-P., CHAKRABORTY P., ETTORI S., FABIAN A., HEINRICH A., KONDO M., HLAVACEK-LARRONDO J., McCALL H., NULSEN P., ROSE T., RUSSELL H., SARKAR A., SCANNAPIECO E., SUDA K., SUN M., TAMHANE P., TRUONG N., WERNER N. and ZHANG C.

Abstract (from CDS):

We stack 3.75 Ms of early XRISM Resolve observations of 10 galaxy clusters to search for unidentified spectral lines in the E = 2.5-15 keV band (rest frame), including the E = 3.5 keV line reported in earlier low spectral resolution studies of cluster samples. Such an emission line may originate from the decay of the sterile neutrino, a warm dark matter (DM) candidate. No unidentified lines are detected in our stacked cluster spectrum, with the 3σ upper limit on the ms ∼ 7.1 keV DM particle decay rate (which corresponds to an E = 3.55 keV emission line) of Γ ∼ 1.0 × 10–27 s–1. This upper limit is 3-4 times lower than the one derived by Hitomi Collaboration from the Perseus observation but still 5 times higher than the XMM-Newton detection reported by E. Bulbul et al. in the stacked cluster sample. XRISM Resolve, with its high spectral resolution but small field of view, may reach the sensitivity needed to test the XMM-Newton cluster sample detection by combining several years worth of future cluster observations.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Galaxy clusters - Intracluster medium - Dark matter - Warm dark matter - X-ray astronomy - X-ray sources

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
3 PKS 0745-19 rG 07 47 31.3247085936 -19 17 40.013334276   19.60       ~ 422 1
4 MCG-02-24-007 LIN 09 18 05.66848602 -12 05 43.8060823   14.38 14.8     ~ 1077 1
5 ZwCl 1021+0426 ClG 10 23 39.0 +04 11 14   15.6 17.95     ~ 297 0
6 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
7 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
8 ACO 3526 ClG 12 48 49.2 -41 18 17           ~ 1154 2
9 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
10 ACO 2029 ClG 15 10 54.2 +05 44 23           ~ 1020 0
11 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
12 ACO 2199 ClG 16 28 34.5 +39 32 26           ~ 1206 1
13 ACO 2319 ClG 19 21 14.0 +43 56 57           ~ 495 1

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