2016A&A...592A.112H

Query : 2016A&A...592A.112H

2016A&A...592A.112H - Astronomy and Astrophysics, volume 592A112-112 (2016/8-1)

7.1 keV sterile neutrino constraints from X-ray observations of 33 clusters of galaxies with Chandra ACIS.

HOFMANN F., SANDERS J.S., NANDRA K., CLERC N. and GASPARI M.

Abstract (from CDS):

Context. Recently an unidentified emission line at 3.55keV has been detected in X-ray spectra of clusters of galaxies. The line has been discussed as a possible decay signature of 7.1keV sterile neutrinos, which have been proposed as a dark matter (DM) candidate.
Aims. We aim to put constraints on the proposed line emission in a large sample of Chandra-observed clusters and obtain limits on the mixing angle in a 7.1keV sterile neutrino DM scenario.
Methods. For a sample of 33 high-mass clusters of galaxies, we merge all observations from the Chandra data archive. Each cluster has more than 100ks of combined exposure. The resulting high signal-to-noise spectra are used to constrain the flux of an unidentified line emission at 3.55keV in the individual spectra and a merged spectrum of all clusters.
Results. We obtained very detailed spectra around the 3.55keV range and limits on an unidentified emission line. Assuming all DM were made of 7.1keV sterile neutrinos, the upper limits on the mixing angle are sin2(2Θ)<10.1x10–11 from ACIS-I and <40.3x10–11 from ACIS-S data at 99.7 per cent confidence level.
Conclusions. We do not find evidence for an unidentified emission line at 3.55keV. The sample extends the list of objects searched for an emission line at 3.55keV and will help to identify the best targets for future studies of the potential DM decay line with upcoming X-ray observatories like Hitomi (Astro-H), eROSITA, and Athena.

Abstract Copyright: © ESO, 2016

Journal keyword(s): galaxies: clusters: general - X-rays: galaxies: clusters - dark matter

CDS comments: m0735, m1455 and pk0745 not identified (incomplete format).

Simbad objects: 35

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Number of rows : 35
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 ACO 401 ClG 02 58 50.3 +13 34 07           ~ 592 0
4 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
5 ZwCl 0335+0956 ClG 03 38 35.3 +09 57 54           ~ 402 1
6 ACO 496 ClG 04 33 40.8 -13 14 34           ~ 728 2
7 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 279 0
8 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 465 0
9 ClG 0657-56 ClG 06 58 26.9 -55 58 21           ~ 1077 1
10 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 457 0
11 NAME HYA SUPERCL SCG 08 57.9 +03 10           ~ 204 0
12 MCG-02-24-007 LIN 09 18 05.66848602 -12 05 43.8060823   14.38 14.8     ~ 1077 1
13 ACO 907 ClG 09 58 21.84 -11 03 47.5           ~ 137 0
14 ZwCl 1021+0426 ClG 10 23 39.0 +04 11 14   15.6 17.95     ~ 297 0
15 ACO 1413 ClG 11 55 12.87 +23 23 46.9           ~ 456 0
16 ACO 1650 ClG 12 58 42.0 -01 45 45           ~ 325 0
17 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
18 ACO 1775 ClG 13 41 50.60 +26 21 10.6           ~ 324 0
19 NAME RXJ1347-SW ClG 13 46 27.20 -11 54 20.2           ~ 4 0
20 ACO 1795 ClG 13 48 47.4 +26 34 55           ~ 1330 0
21 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 727 1
22 ACO 1995 ClG 14 52 55.0 +58 02 59           ~ 140 0
23 ACO 2034 ClG 15 10 03.9 +33 30 57           ~ 248 1
24 ACO 2052 ClG 15 16 41.64 +07 01 45.5           ~ 756 1
25 ACO 2146 ClG 15 56 04.7 +66 20 24           ~ 192 0
26 ACO 2199 ClG 16 28 34.5 +39 32 26           ~ 1206 1
27 ACO 2204 ClG 16 32 47.7 +05 34 18           ~ 457 0
28 MCG+01-43-006 SyG 16 51 07.9886687784 +04 59 35.547131472     18.25     ~ 502 1
29 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
30 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
31 BAX 299.8681+40.7339 ClG 19 59 30.3 +40 44 11           ~ 143 0
32 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 676 1
33 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 732 2
34 ACO S 1101 ClG 23 13 58.5 -42 43 39           ~ 272 1
35 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 572 0

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