2017A&A...606A.118H

Query : 2017A&A...606A.118H

2017A&A...606A.118H - Astronomy and Astrophysics, volume 606A, 118-118 (2017/10-1)

eROSITA cluster cosmology forecasts: Cluster temperature substructure bias.

HOFMANN F., SANDERS J.S., CLERC N., NANDRA K., RIDL J., DENNERL K., RAMOS-CEJA M., FINOGUENOV A. and REIPRICH T.H.

Abstract (from CDS):

Context. The eROSITA mission will provide the largest sample of galaxy clusters detected in X-ray to date (one hundred thousand expected). This sample will be used to constrain cosmological models by measuring cluster masses. An important mass proxy is the electron temperature of the hot plasma detected in X-rays.
Aims. We want to understand the detection properties and possible bias in temperatures due to unresolved substructures in the cluster halos.
Methods. We simulated a large number of galaxy cluster spectra with known temperature substructures and compared the results from analysing eROSITA simulated observations to earlier results from Chandra.
Results. We were able to constrain a bias in cluster temperatures and its impact on cluster masses, as well as cosmological parameters derived from the survey. We found temperatures in the eROSITA survey to be biased low by about five per cent due to unresolved temperature substructures (compared to emission-weighted average temperatures from the Chandra maps). This bias would have a significant impact on the eROSITA cosmology constraints if not accounted for in the calibration.
Conclusions. We isolated the bias effect that substructures in galaxy clusters have on temperature measurements and their impact on derived cosmological parameters in the eROSITA cluster survey.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: clusters: general - X-rays: galaxies: clusters - cosmological parameters - cosmological parameters

Simbad objects: 33

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Number of rows : 33
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 813 0
2 ACO 401 ClG 02 58 56.9 +13 34 56           ~ 566 0
3 ZwCl 0335+0956 ClG 03 38 35.3 +09 57 54           ~ 383 1
4 ACO 496 ClG 04 33 38.8 -13 15 59           ~ 694 2
5 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 249 0
6 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 436 0
7 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 963 1
8 ZwCl 0735+7421 ClG 07 41 40.3 +74 14 58     17.70     ~ 254 0
9 ClG 0745-19 ClG 07 47 31.3 -19 17 40           ~ 372 0
10 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 437 0
11 NAME Hya A LIN 09 18 05.66848602 -12 05 43.8060823   14.38 14.8     ~ 1012 1
12 ACO 907 ClG 09 58 21.84 -11 03 47.5           ~ 129 0
13 ZwCl 1021+0426 ClG 10 23 39.0 +04 11 14   15.6 17.95     ~ 283 0
14 ACO 1413 ClG 11 55 12.87 +23 23 46.9           ~ 430 0
15 ACO 1650 ClG 12 58 42.0 -01 45 45           ~ 304 0
16 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1125 0
17 ACO 1775 ClG 13 41 50.60 +26 21 10.6           ~ 304 0
18 NAME RXJ1347-SW ClG 13 46 27.20 -11 54 20.2           ~ 4 0
19 ACO 1795 ClG 13 48 50.48 +26 35 07.4           ~ 1267 0
20 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 689 1
21 ACO 1995 ClG 14 52 55.0 +58 02 59           ~ 130 0
22 ZwCl 1455+2232 ClG 14 57 15.2 +22 20 30     18.62 20.04   ~ 294 0
23 ACO 2034 ClG 15 10 12.96 +33 29 53.2           ~ 215 1
24 ACO 2052 ClG 15 16 41.64 +07 01 45.5           ~ 730 1
25 ACO 2146 ClG 15 56 04.7 +66 20 24           ~ 176 0
26 ACO 2199 ClG 16 28 43.31 +39 34 07.6           ~ 1171 1
27 ACO 2204 ClG 16 32 45.7 +05 34 43           ~ 436 0
28 NAME Hercules A rG 16 51 07.9886687784 +04 59 35.547131472     18.25     ~ 465 1
29 NAME Cyg A Sy2 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2368 2
30 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 627 1
31 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 688 2
32 ACO S 1101 ClG 23 13 58.5 -42 43 39           ~ 258 1
33 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 539 0

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