2005ApJS..161..224D


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.18CEST11:50:31

2005ApJS..161..224D - Astrophys. J., Suppl. Ser., 161, 224-239 (2005/December-0)

Constraints on intracluster gas bulk motions in clusters of galaxies with ASCA.

DUPKE R.A. and BREGMAN J.N.

Abstract (from CDS):

The recent detection of Doppler shifts of X-ray spectral lines in the intracluster gas of the Centaurus and Perseus clusters of galaxies with ASCA has raised the question of the frequency of such velocity gradients and their relation to other cluster properties. To address this and improve the sample of ICM velocity gradient candidates we carried out a systematic search of the ASCA archive for clusters with suitable observing conditions that allow full azimuthal mapping of gas velocities near the central regions. Here we present the results of the azimuthal velocity distribution of a sample consisting of the ``best'' observed clusters for velocity analysis. Our sample encompasses clusters with different physical and morphological characteristics, including both well-behaved ``cooling flow'' and dynamically active clusters. The gas temperatures of the clusters in our sample range from 1.4 to 6.3 keV. We find velocity substructures in ∼15% of the clusters in our sample on the order of a few x103 km/s. The significance of the velocity gradients' is greater than 99% in Abell 576 and RX J0419.6+0225, the clusters where velocity gradients are most significant. The velocity gradients are consistent with transitory and/or rotational bulk motion. The velocity gradients in these clusters are unlikely to be due to projected temperature anisotropies, ASCA PSF, intrachip gain variations, and flux contamination from other sources. Chandra images of these clusters do not show obvious cluster alignments within the field of view covered by ASCA. We also noticed a high frequency (∼50%) of anisotropic temperature gradients in the core of ``cooling flow'' clusters, suggesting the presence of frequent dynamical activity in the core of galaxy clusters.

Abstract Copyright:

Journal keyword(s): Galaxies: Cooling Flows - Galaxies: Clusters: General - Galaxies: Intergalactic Medium - X-Rays: Galaxies: Clusters

Simbad objects: 18

goto Full paper

goto View the reference in ADS

Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 809 0
2 ACO 376 ClG 02 45 48 +36 51.6           B8.5 147 1
3 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 2004 1
4 ACO 3158 ClG 03 42 39.6 -53 37 50           ~ 275 0
5 RBS 533 GrG 04 19 38.2 +02 25 12           ~ 39 1
6 ACO 576 ClG 07 21 24.1 +55 44 20           ~ 286 1
7 ACO 644 ClG 08 17 24.5 -07 30 46           ~ 207 0
8 2E 2425 ClG 11 14 17.0 -38 10 43     18.0     ~ 25 0
9 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 993 2
10 ACO 1650 ClG 12 58 36.76 -01 43 34.2           ~ 278 0
11 ACO 3558 ClG 13 27 54.8 -31 29 32           ~ 410 2
12 ACO 2052 ClG 15 16 45.5 +07 00 01           ~ 689 1
13 ACO 2142 ClG 15 58 20.00 +27 14 00.3           ~ 688 0
14 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 782 1
15 ACO 2244 ClG 17 02 34.01 +34 04 41.1           ~ 248 0
16 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 574 1
17 ACO 2589 ClG 23 24 00.5 +16 49 29           ~ 300 1
18 ACO 2657 ClG 23 44 51.0 +09 08 40           ~ 263 3

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2005ApJS..161..224D and select 'bookmark this link' or equivalent in the popup menu


2021.04.18-11:50:31

© Université de Strasbourg/CNRS

    • Contact