2017A&A...606A...1A


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST02:19:39

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

Properties of the cosmological filament between two clusters: A possible detection of a large-scale accretion shock by Suzaku.

AKAMATSU H., FUJITA Y., AKAHORI T., ISHISAKI Y., HAYASHIDA K., HOSHINO A., MERNIER F., YOSHIKAWA K., SATO K. and KAASTRA J.S.

Abstract (from CDS):

We report on the results of a Suzaku observation of the plasma in the filament located between the two massive clusters of galaxies, Abell 399 and Abell 401. Abell 399 (z=0.0724) and Abell 401 (z=0.0737) are expected to be in the initial phase of a cluster merger. In the region between the two clusters, we find a clear enhancement in the temperature of the filament plasma from 4keV (expected value of a typical cluster temperature profile) to kT∼6.5keV. Our analysis also shows that filament plasma is present out to a radial distance of 15' (1.3Mpc) from a line connecting the two clusters. The temperature profile is characterized by an almost flat radial shape with kT∼6-7keV within 10' or ∼0.8Mpc. Across r=8' from the axis, the temperature of the filament plasma shows a drop from 6.3keV to 5.1keV, indicating the presence of a shock front. The Mach number based on the temperature drop is estimated to be M∼1.3. We also successfully determined the abundance profile up to 15' (1.3Mpc), showing an almost constant value (Z=0.3 solar) at the cluster outskirts. We estimated the Compton y parameter to be ∼14.5±1.3x10–6, which is in agreement with the Planck results (14-17x10–6 on the filament). The line-of-sight depth of the filament is l∼1.1Mpc, which indicates that the geometry of filament is likely a pancake shape rather than cylindrical. The total mass of the filamentary structure is ∼7.7x1013M. We discuss a possible interpretation of the drop of X-ray emission at the rim of the filament, which was pushed out by the merging activity and formed by the accretion flow induced by the gravitational force of the filament.

Abstract Copyright: © ESO, 2017

Journal keyword(s): X-rays: galaxies: clusters - intergalactic medium - galaxies: abundances - large-scale structure of Universe - galaxies: clusters: intracluster medium - galaxies: clusters: intracluster medium

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 346 0
2 ACO 401 ClG 02 58 56.9 +13 34 56           ~ 519 0
3 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 1939 1
4 ACO 3528 ClG 12 54 18.2 -29 01 16           ~ 148 1
5 ACO 3556 ClG 13 24 06.2 -31 39 38           ~ 138 0
6 ACO 3558 ClG 13 27 54.8 -31 29 32           ~ 406 2
7 ACO 1750 ClG 13 30 49.94 -01 52 22.1           ~ 146 1
8 2MAXI J1358-478 ClG 13 58 56.9 -47 50 19           ~ 17 0
9 NAME LHB X 16 42.0 +02 19           ~ 256 0
10 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2112 2
11 2E 4589 ClG 22 18 41.6 -03 45 57     16.0     ~ 20 1

    Equat.    Gal    SGal    Ecl

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2020.07.04-02:19:39

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