skip to main content

DOE PAGESDOE PAGES

Title: CHANDRA and XMM-NEWTON observations of the bimodal PLANCK SZ-detected clustered CKG345.40-39.34 (A3716) with high and low entropy subcluster cores

Here, we present results from Chandra, XMM-Newton, and ROSAT observations of the Planck SZ-detected cluster A3716 (PLCKG345.40-39.34-G345). We show that G345 is, in fact, two subclusters separated on the sky by 400 kpc. We measure the subclusters' gas temperatures (~2–3 keV), total (~1–2 × 10 14 $${{M}_{\odot }}$$) and gas (~1–2 × 10 13 $${{M}_{\odot }}$$) masses, gas mass fraction within r500, entropy profiles, and X-ray luminosities (~10 43 erg s -1). Using the gas density and temperature profiles for both subclusters, we show that there is good (0.8σ) agreement between the expected Sunyaev–Zel'dovich signal predicted from the X-ray data and that measured from the Planck mission, and better agreement within 0.6σ when we re-computed the Planck value assuming a two component cluster model, with relative amplitudes fixed based on the X-ray data. Dynamical analysis shows that the two galaxy subclusters are very likely ($$\gt 97\%$$ probability) gravitationally bound, and in the most likely scenario, the subclusters will undergo core passage in 500 ± 200 Myr. The northern subcluster is centrally peaked and has a low entropy core, while the southern subcluster has a high central entropy. Finally, the high central entropy in the southern subcluster can be explained either by the mergers of several groups, as suggested by the presence of five giant ellipticals or by active galactic nucleus energy injection, as suggested by the presence of a strong radio source in one of its massive elliptical galaxies, or by a combination of both processes.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [3] ;  [4] ;  [5] ;  [4] ;  [6]
  1. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  2. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States) ; Johns Hopkins Univ., Baltimore, MD (United States). Department of Physics and Astronomy
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Laboratoire AIM, IRFU/Service d Astrophysique CEA/DSM CNRS Universite Paris Diderot (France)
  5. Universite de Toulouse (France); CNRS (France)
  6. DSM/Irfu/SPP, CEA-Saclay (France)
Publication Date:
Report Number(s):
LLNL-JRNL-659077
Journal ID: ISSN 1538-4357
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 803; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galaxies: clusters: general; galaxies: clusters: individual (A3716); large-scale structure of universe; X-rays: galaxies: clusters
OSTI Identifier:
1406444

Andrade-Santos, Felipe, Jones, Christine, Forman, William R., Murray, Stephen S., Kraft, Ralph P., Vikhlinin, Alexey, Weeren, Reinout J. van, Nulsen, Paul E. J., David, Laurence P., Dawson, William A., Arnaud, Monique, Pointecouteau, Etienne, Pratt, Gabriel W., and Melin, Jean-Baptiste. CHANDRA and XMM-NEWTON observations of the bimodal PLANCK SZ-detected clustered CKG345.40-39.34 (A3716) with high and low entropy subcluster cores. United States: N. p., Web. doi:10.1088/0004-637X/803/2/108.
Andrade-Santos, Felipe, Jones, Christine, Forman, William R., Murray, Stephen S., Kraft, Ralph P., Vikhlinin, Alexey, Weeren, Reinout J. van, Nulsen, Paul E. J., David, Laurence P., Dawson, William A., Arnaud, Monique, Pointecouteau, Etienne, Pratt, Gabriel W., & Melin, Jean-Baptiste. CHANDRA and XMM-NEWTON observations of the bimodal PLANCK SZ-detected clustered CKG345.40-39.34 (A3716) with high and low entropy subcluster cores. United States. doi:10.1088/0004-637X/803/2/108.
Andrade-Santos, Felipe, Jones, Christine, Forman, William R., Murray, Stephen S., Kraft, Ralph P., Vikhlinin, Alexey, Weeren, Reinout J. van, Nulsen, Paul E. J., David, Laurence P., Dawson, William A., Arnaud, Monique, Pointecouteau, Etienne, Pratt, Gabriel W., and Melin, Jean-Baptiste. 2015. "CHANDRA and XMM-NEWTON observations of the bimodal PLANCK SZ-detected clustered CKG345.40-39.34 (A3716) with high and low entropy subcluster cores". United States. doi:10.1088/0004-637X/803/2/108. https://www.osti.gov/servlets/purl/1406444.
@article{osti_1406444,
title = {CHANDRA and XMM-NEWTON observations of the bimodal PLANCK SZ-detected clustered CKG345.40-39.34 (A3716) with high and low entropy subcluster cores},
author = {Andrade-Santos, Felipe and Jones, Christine and Forman, William R. and Murray, Stephen S. and Kraft, Ralph P. and Vikhlinin, Alexey and Weeren, Reinout J. van and Nulsen, Paul E. J. and David, Laurence P. and Dawson, William A. and Arnaud, Monique and Pointecouteau, Etienne and Pratt, Gabriel W. and Melin, Jean-Baptiste},
abstractNote = {Here, we present results from Chandra, XMM-Newton, and ROSAT observations of the Planck SZ-detected cluster A3716 (PLCKG345.40-39.34-G345). We show that G345 is, in fact, two subclusters separated on the sky by 400 kpc. We measure the subclusters' gas temperatures (~2–3 keV), total (~1–2 × 1014 ${{M}_{\odot }}$) and gas (~1–2 × 1013 ${{M}_{\odot }}$) masses, gas mass fraction within r500, entropy profiles, and X-ray luminosities (~1043 erg s-1). Using the gas density and temperature profiles for both subclusters, we show that there is good (0.8σ) agreement between the expected Sunyaev–Zel'dovich signal predicted from the X-ray data and that measured from the Planck mission, and better agreement within 0.6σ when we re-computed the Planck value assuming a two component cluster model, with relative amplitudes fixed based on the X-ray data. Dynamical analysis shows that the two galaxy subclusters are very likely ($\gt 97\%$ probability) gravitationally bound, and in the most likely scenario, the subclusters will undergo core passage in 500 ± 200 Myr. The northern subcluster is centrally peaked and has a low entropy core, while the southern subcluster has a high central entropy. Finally, the high central entropy in the southern subcluster can be explained either by the mergers of several groups, as suggested by the presence of five giant ellipticals or by active galactic nucleus energy injection, as suggested by the presence of a strong radio source in one of its massive elliptical galaxies, or by a combination of both processes.},
doi = {10.1088/0004-637X/803/2/108},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 803,
place = {United States},
year = {2015},
month = {4}
}