2019A&A...628A..43K

Query : 2019A&A...628A..43K

2019A&A...628A..43K - Astronomy and Astrophysics, volume 628A43-43 (2019/8-1)

Toward a characterization of X-ray galaxy clusters for cosmology.

KAFER F., FINOGUENOV A., ECKERT D., SANDERS J.S., REIPRICH T.H. and NANDRA K.

Abstract (from CDS):


Context. In the framework of the hierarchical model the intra-cluster medium properties of galaxy clusters are tightly linked to structure formation, which makes X-ray surveys well suited for cosmological studies. To constrain cosmological parameters accurately by use of galaxy clusters in current and future X-ray surveys, a better understanding of selection effects related to the detection method of clusters is needed.
Aims. We aim at a better understanding of the morphology of galaxy clusters to include corrections between the different core types and covariances with X-ray luminosities in selection functions. In particular, we stress the morphological deviations between a newly described surface brightness profile characterization and a commonly used single β-model.
Methods. We investigated a novel approach to describe surface brightness profiles, where the excess cool-core emission in the centers of the galaxy clusters is modeled using wavelet decomposition. Morphological parameters and the residuals were compared to classical single β-models, fitted to the overall surface brightness profiles. Results. Using single β-models to describe the ensemble of overall surface brightness profiles leads on average to a non-zero bias (0.032±0.003) in the outer part of the clusters, that is an approximate 3% systematic difference in the surface brightness at large radii. Furthermore, β-models show a general trend toward underestimating the flux in the outskirts for smaller core radii. Fixing the β parameter to 2/3 doubles the bias and increases the residuals from a single β-model up to more than 40%. Modeling the core region in the fitting procedure reduces the impact of these two effects significantly. In addition, we find a positive scaling between shape parameters and temperature, as well as a negative correlation of approximately -0.4 between extent and luminosity. Conclusion. We demonstrate the caveats in modeling galaxy clusters with single β-models and recommend using them with caution, especially when the systematics are not taken into account. Our non-parametric analysis of the self-similar scaled emission measure profiles indicates no systematic core-type differences of median profiles in the galaxy cluster outskirts.

Abstract Copyright: © F. Käfer et al. 2019

Journal keyword(s): X-rays: galaxies: clusters - galaxies: clusters: general - cosmology: observations

Simbad objects: 63

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Number of rows : 63
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 85 ClG 00 41 36.21 -09 19 30.4           ~ 974 0
2 ACO 119 ClG 00 56 08.57 -01 12 00.8           ~ 577 2
3 ACO 133 ClG 01 02 41.5 -21 52 53           ~ 391 1
4 NGC 507 rG 01 23 39.950 +33 15 22.22   13.0       ~ 459 1
5 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 727 1
6 ACO 400 ClG 02 57 37.4 +06 00 45           ~ 408 3
7 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 420 0
8 ACO 401 ClG 02 58 50.3 +13 34 07           ~ 592 0
9 ACO 3112 ClG 03 17 52.9 -44 15 06           ~ 329 1
10 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
11 ZwCl 0335+0956 ClG 03 38 35.3 +09 57 54           ~ 402 1
12 2MASX J03411752+1523477 BiC 03 41 17.5329189192 +15 23 47.567775336   17.5       ~ 46 1
13 ACO 3158 ClG 03 43 07.5 -53 38 09           ~ 327 0
14 ACO 478 ClG 04 13 24.8 +10 27 52           ~ 522 0
15 NGC 1550 BiC 04 19 37.9450450152 +02 24 35.918168940   14.0       ~ 183 1
16 ClG 0422-09 ClG 04 25 51.02 -08 33 38.5           ~ 97 0
17 ACO 3266 ClG 04 31 26.4 -61 25 17           ~ 447 0
18 ACO 496 ClG 04 33 40.8 -13 14 34           ~ 728 2
19 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 334 0
20 ACO 3391 ClG 06 26 15.4 -53 40 52           ~ 222 1
21 ACO 576 ClG 07 21 24.1 +55 44 20           ~ 312 1
22 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
23 ACO 780 ClG 09 18 30 -12 15.7           ~ 469 0
24 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 905 1
25 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1127 1
26 NAME NGC 4073 Group GrG 12 04 44.08 +01 48 40.9     13.53     ~ 292 0
27 ZwCl 1215+0400 ClG 12 17 43.62 +03 38 51.5           ~ 169 0
28 NGC 4636 LIN 12 42 49.8333280080 +02 41 15.951929028   12.62 11.84     ~ 1156 1
29 ACO 3526 ClG 12 48 49.2 -41 18 17           ~ 1154 2
30 ACO 1644 ClG 12 57 11.6 -17 24 34           ~ 391 1
31 ACO 1650 ClG 12 58 42.0 -01 45 45           ~ 325 0
32 ACO 1651 ClG 12 59 27.3 -04 10 49           ~ 307 0
33 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
34 NGC 5044 BiC 13 15 23.9607836592 -16 23 07.547751744   11.9   10.74   ~ 531 0
35 ACO 1736 ClG 13 26 52.1 -27 06 33           ~ 268 2
36 ACO 3558 ClG 13 28 03.2 -31 31 35           ~ 476 2
37 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 337 1
38 ACO 3571 ClG 13 47 32.4 -32 50 12           ~ 308 2
39 ACO 1795 ClG 13 48 47.4 +26 34 55           ~ 1330 0
40 ACO 3581 ClG 14 07 29.8 -27 01 04           ~ 197 3
41 BAX 220.1796+03.4530 ClG 14 40 34.37 +03 29 49.7     14.31     ~ 131 0
42 ClG J1504-0248 ClG 15 04 07.4 -02 48 15           ~ 186 0
43 ACO 2029 ClG 15 10 54.2 +05 44 23           ~ 1020 0
44 ACO 2052 ClG 15 16 41.64 +07 01 45.5           ~ 756 1
45 ACT-CL J1521.8+0742 ClG 15 21 48.8 +07 43 41     15.13     ~ 326 0
46 ACO 2065 ClG 15 22 22.7 +27 44 20           ~ 398 0
47 ACO 2063 ClG 15 23 01.8 +08 38 22           ~ 414 2
48 ACO 2142 ClG 15 58 26.5 +27 13 52           ~ 825 0
49 ACO 2147 ClG 16 02 11.96 +15 55 11.5           ~ 416 0
50 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 586 0
51 ACO 2199 ClG 16 28 34.5 +39 32 26           ~ 1206 1
52 ACO 2204 ClG 16 32 47.7 +05 34 18           ~ 457 0
53 ACO 2244 ClG 17 02 40.33 +34 02 58.7           ~ 301 0
54 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
55 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
56 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 676 1
57 ACO S 1101 ClG 23 13 58.5 -42 43 39           ~ 272 1
58 ACO 2589 ClG 23 24 00.5 +16 49 29           ~ 327 1
59 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 572 0
60 ACO 2634 ClG 23 38 18.4 +27 01 37           ~ 515 2
61 ACO 2657 ClG 23 44 51.0 +09 08 40           ~ 280 3
62 ACO 4038 ClG 23 47 31.1 -28 12 10           ~ 349 3
63 ACO 4059 ClG 23 57 02.2 -34 45 58           ~ 400 1

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