2016ApJ...831...55B

Query : 2016ApJ...831...55B

2016ApJ...831...55B - Astrophys. J., 831, 55-55 (2016/November-1)

Searching for the 3.5 keV line in the stacked Suzaku observations of galaxy clusters.

BULBUL E., MARKEVITCH M., FOSTER A., MILLER E., BAUTZ M., LOEWENSTEIN M., RANDALL S.W. and SMITH R.K.

Abstract (from CDS):

We perform a detailed study of the stacked Suzaku observations of 47 galaxy clusters, spanning a redshift range of 0.01-0.45, to search for the unidentified 3.5 keV line. This sample provides an independent test for the previously detected line. We detect a 2σ-significant spectral feature at 3.5 keV in the spectrum of the full sample. When the sample is divided into two subsamples (cool-core and non-cool core clusters), the cool-core subsample shows no statistically significant positive residuals at the line energy. A very weak (∼2σconfidence) spectral feature at 3.5 keV is permitted by the data from the non-cool-core clusters sample. The upper limit on a neutrino decay mixing angle of sin2(2θ)=6.1×10–11 from the full Suzaku sample is consistent with the previous detections in the stacked XMM-Newton sample of galaxy clusters (which had a higher statistical sensitivity to faint lines), M31, and Galactic center, at a 90% confidence level. However, the constraint from the present sample, which does not include the Perseus cluster, is in tension with previously reported line flux observed in the core of the Perseus cluster with XMM-Newton and Suzaku.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): dark matter - galaxies: clusters: general - large-scale structure of universe - line: identification - line: identification

Simbad objects: 52

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Number of rows : 52
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 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
2 ACO 2811 ClG 00 42 08.82 -28 32 08.8           ~ 78 0
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
4 ACO 115 ClG 00 55 59 +26 23.2           ~ 295 1
5 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 727 1
6 ACO 272 ClG 01 55 19.1 +33 56 41           ~ 66 0
7 2A 0251+413 ClG 02 54 26.6 +41 33 25           ~ 328 1
8 ACO 3112 ClG 03 17 52.9 -44 15 06           ~ 329 1
9 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
10 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
11 ACO 496 ClG 04 33 40.8 -13 14 34           ~ 728 2
12 ClG 0657-56 ClG 06 58 26.9 -55 58 21           ~ 1077 1
13 ACO 566 ClG 07 04 37.5 +63 18 39           ~ 71 0
14 PKS 0745-19 rG 07 47 31.3247085936 -19 17 40.013334276   19.60       ~ 422 1
15 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
16 ACO S 636 ClG 10 29 41.0957 -35 19 32.908           ~ 248 0
17 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 905 1
18 ACO 1246 ClG 11 23 57.4 +21 29 14           ~ 118 0
19 ACO 3526 ClG 12 48 49.2 -41 18 17           ~ 1154 2
20 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
21 ACO 1674 ClG 13 03 56.5 +67 31 04           ~ 54 0
22 ACO 1750 ClG 13 30 50.44 -01 51 27.1           ~ 190 2
23 ClG J1347-1145 ClG 13 47 30.5 -11 45 07           ~ 577 0
24 ACO 3571 ClG 13 47 32.4 -32 50 12           ~ 308 2
25 ACO 1795 ClG 13 48 47.4 +26 34 55           ~ 1330 0
26 ACO 1800 ClG 13 49 27.19 +28 04 44.6           ~ 127 0
27 ACO 1831 ClG 13 59 19.42 +27 58 08.2           ~ 166 0
28 ACO 3581 ClG 14 07 29.8 -27 01 04           ~ 197 3
29 ACO 2029 ClG 15 10 54.2 +05 44 23           ~ 1020 0
30 ClG J1514+3636 ClG 15 14 22.0 +36 36 22     19.0     ~ 136 0
31 ACO 2061 ClG 15 21 19.90 +30 37 13.0           ~ 214 1
32 ACO 2142 ClG 15 58 26.5 +27 13 52           ~ 825 0
33 ACO 3627 ClG 16 14 22.5 -60 52 07           ~ 340 2
34 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
35 ACO 2199 ClG 16 28 34.5 +39 32 26           ~ 1206 1
36 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 827 1
37 BAX 249.5848-64.5165 ClG 16 38 13.2 -64 21 21           ~ 123 0
38 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 381 0
39 ACO 2244 ClG 17 02 40.33 +34 02 58.7           ~ 301 0
40 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
41 ACO 2249 ClG 17 09 36.76 +34 28 04.1           ~ 136 0
42 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
43 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
44 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 676 1
45 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 732 2
46 ACT-CL J2218.6-0345 ClG 22 18 40.3 -03 46 47     16.0     ~ 33 1
47 BAX 334.7042-02.9686 ClG 22 18 54.01 -02 59 01.2           ~ 16 0
48 ACO 2495 ClG 22 50 17.10 +10 55 01.2           ~ 87 0
49 ACO 2537 ClG 23 08 22.3 -02 11 29           ~ 152 0
50 ACO S 1101 ClG 23 13 58.5 -42 43 39           ~ 272 1
51 ZwCl 2341+0000 ClG 23 43 40.566 +00 18 18.94           ~ 83 0
52 ACO 2665 ClG 23 50 50.6 +06 09 00           ~ 106 0

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