2012A&A...546A..79I


Query : 2012A&A...546A..79I

2012A&A...546A..79I - Astronomy and Astrophysics, volume 546A, 79-79 (2012/10-1)

The 400d Galaxy Cluster Survey weak lensing programme. II. Weak lensing study of seven clusters with MMT/MegaCam.

ISRAEL H., ERBEN T., REIPRICH T.H., VIKHLININ A., SARAZIN C.L. and SCHNEIDER P.

Abstract (from CDS):

Evolution in the mass function of galaxy clusters sensitively traces both the expansion history of the Universe and cosmological structure formation. Robust cluster mass determinations are a key ingredient for a reliable measurement of this evolution, especially at high redshift. Weak gravitational lensing is a promising tool for, on average, unbiased mass estimates. This weak lensing project aims at measuring reliable weak lensing masses for a complete X-ray selected sample of 36 high redshift (0.35<z<0.9) clusters. The goal of this paper is to demonstrate the robustness of the methodology against commonly encountered problems, including pure instrumental effects, the presence of bright (8-9mag) stars close to the cluster centre, ground based measurements of high-z (z∼0.8) clusters, and the presence of massive unrelated structures along the line-sight. We select a subsample of seven clusters observed with MMT/MegaCam. Instrumental effects are checked in detail by cross-comparison with an archival CFHT/MegaCam observation. We derive mass estimates for seven clusters by modelling the tangential shear with an NFW profile, in two cases with multiple components to account for projected structures in the line-of-sight. We firmly detect lensing signals from all seven clusters at more than 3.5σ and determine their masses, ranging from 1014M to 1015M, despite the presence of nearby bright stars. We retrieve the lensing signal of more than one cluster in the CL 1701+6414 field, while apparently observing CL 1701+6414 through a massive foreground filament. We also find a multi-peaked shear signal in CL 1641+4001. Shear structures measured in the MMT and CFHT images of CL 1701+6414 are highly correlated. We confirm the capability of MMT/MegaCam to infer weak lensing masses from high-z clusters, demonstrated by the high level of consistency between MMT and CFHT results for CL1701+6414. This shows that, when a sophisticated analysis is applied, instrumental effects are well under control.

Abstract Copyright:

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

VizieR on-line data: <Available at CDS (J/A+A/546/A79): list.dat fits/*>

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ClG J0030+2618 ClG 00 30 33.6 +26 18 16           ~ 58 0
2 HD 12134 * 01 59 10.3365192912 +00 30 24.891495912   8.62 8.26     F0V 21 0
3 ClG J0159+0030 ClG 01 59 18.2 +00 30 09           ~ 28 0
4 ClG J0230+1836 ClG 02 30 26.6 +18 36 22           ~ 17 0
5 HD 15551 * 02 30 30.1463385864 +18 39 51.643050552   9.34 8.26     K0 8 0
6 HD 67543 * 08 09 34.2762312696 +28 11 46.756564548   9.63 8.59     K0 3 0
7 ZwCl 0806+2822 ClG 08 09 41.0 +28 11 58           ~ 22 0
8 ClG J1357+6232 ClG 13 57 19.4 +62 32 42           ~ 17 0
9 NSCS J135722+623311 ClG 13 57 21.91 +62 33 10.8           ~ 1 0
10 SDSS J135723.83+623246.1 G 13 57 23.8404687792 +62 32 46.120770456           ~ 1 0
11 SDSS J141603.01+443725.1 BiC 14 16 03.0200728056 +44 37 25.095832644           ~ 2 0
12 SDSS J141613.33+443951.3 BiC 14 16 13.331 +44 39 51.38           ~ 3 0
13 ClG J1416+4446 ClG 14 16 28.1 +44 46 38           ~ 44 0
14 SDSS-C4-DR3 3628 ClG 16 41 47.0 +39 59 04           ~ 3 0
15 UGC 10512 BiC 16 41 47.0556319224 +39 59 03.944510736   14.8       ~ 29 0
16 ClG J1641+4001 ClG 16 41 52.3 +40 01 29           ~ 37 0
17 ACO 2246 ClG 17 00 41.94 +64 13 16.9           ~ 47 0
18 ClG J1701+6414 ClG 17 01 22.6 +64 14 09           ~ 67 0
19 ClG J1701+6421 ClG 17 01 48.77 +64 21 03.0           ~ 15 0
20 RX J1702.0+6407 ClG 17 02 00.94 +64 07 39.0           ~ 2 0
21 ClG J1702+6420 ClG 17 02 13.58 +64 20 07.3           ~ 13 0
22 ACO 2264 ClG 17 23 44 +29 11.3           ~ 4 0

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2022.08.10-19:02:08

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