skip to main content

Title: Gas bulk motion in the Perseus Cluster measured with Suzaku

We present the results from Suzaku observations of the Perseus Cluster, which is relatively close, the brightest in the X-ray sky, and a relaxed object with a cool core. A number of exposures of central regions and offset pointing with the X-ray Imaging Spectrometer cover a region within radii of 20'-30'. The central data are used to evaluate the instrumental energy-scale calibration with accuracy confirmed to within around 300 km s{sup –1} by the spatial and temporal variation of the instruments. These deep and well-calibrated data are used to measure X-ray redshifts of the intracluster medium. A hint of gas bulk motion, with radial velocity of about –(150-300) km s{sup –1} relative to the main system, was found at 2'-4' (45-90 kpc) west of the cluster center, where an X-ray excess and a cold front were found previously. No other velocity structure was discovered. Over spatial scales of 50-100 kpc and within 200 kpc radii of the center, the gas-radial-velocity variation is below 300 km s{sup –1}, while over scales of 400 kpc within 600 kpc radii, the variation is below 600 km s{sup –1}. These X-ray redshift distributions are compared spatially with those of optical member galaxies for themore » first time in galaxy clusters. Based on X-ray line widths, gas turbulent velocities within these regions are also constrained within 1000-3000 km s{sup –1}. These results of gas dynamics in the core and larger scales in association with cluster merger activities are discussed, and the future potential of high-energy resolution spectroscopy with ASTRO-H is considered.« less
Authors:
; ;  [1] ;  [2] ; ;  [3] ; ;  [4] ;  [5] ;  [6] ;  [7]
  1. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 229-8510 (Japan)
  2. Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526 (Japan)
  3. Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka 560-0043 Osaka (Japan)
  4. Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjyuku-ku, Tokyo 162-8601 (Japan)
  5. Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)
  6. Department of Physics, Nara Women's University, Kitauoyanishimachi, Nara 630-8506 (Japan)
  7. Department of Physics, Yamagata University, 1-4-12 Kojirakawa-machi, Yamagata 990-8560 (Japan)
Publication Date:
OSTI Identifier:
22348030
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 782; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCURACY; CALIBRATION; COMPARATIVE EVALUATIONS; DISTRIBUTION; ENERGY RESOLUTION; GALAXY CLUSTERS; RADIAL VELOCITY; RED SHIFT; SPECTROMETERS; SPECTROSCOPY; VARIATIONS; X RADIATION; X-RAY GALAXIES