Suzaku and XMM-Newton observations of the newly discovered early-stage cluster merger of 1E2216.0-0401 and 1E2215.7-0404

被引:13
作者
Akamatsu, H. [1 ]
Gu, L. [1 ]
Shimwell, T. W. [2 ]
Mernier, F. [1 ,2 ]
Mao, J. [1 ,2 ]
Urdampilleta, I. [1 ,2 ]
de Plaa, J. [1 ]
Rottgering, H. J. A. [2 ]
Kaastra, J. S. [1 ,2 ]
机构
[1] SRON Netherlands Inst Space Res, Sorbonnelaan 2, NL-3584 CA Utrecht, Netherlands
[2] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands
关键词
shock waves; galaxies: clusters: intracluster medium; X-rays: galaxies: clusters; radio continuum: galaxies; galaxies: clusters: individual: 1E2216.0-0401; galaxies: clusters: individual: 1E2215.7-0404; LARGE-SCALE STRUCTURE; X-RAY; GALAXY CLUSTERS; INTRACLUSTER MEDIUM; MERGING CLUSTERS; BINARY CLUSTER; SHOCK FRONTS; DARK-MATTER; ABELL; 2146; SKY SURVEY;
D O I
10.1051/0004-6361/201629275
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present the results of Suzaku and XMM-Newton X-ray observations of the cluster pair 1E2216.0-0401 and 1E2215.7-0404. We discover an X-ray bridge between the clusters. Suzaku and XMM-Newton observations revealed that each cluster hosts gas with moderate temperature of kT(0401) = 4.8 +/- 0.1 keV and kT(0404) = 5.8 +/- 0.2 keV, respectively. On the other hand, the bridge region shows a remarkably high temperature (kT = 6.6 +/- 0.5 keV). Furthermore, at the position of the bridge, we detected an enhancement in the wavelet-decomposed soft-band (0.5-4.0 keV) XMM-Newton image at 3 sigma significance, this is most likely due to a compression of the intracluster medium (ICM) as a consequence of the merging activity. This X-ray intensity and temperature enhancement are not consistent with those expected from a late phase, but are in agreement with the predictions by numerical simulations of an early phase merger. From the temperature jump at the location of the bridge, the Mach number is estimated to be M = 1.4 +/- 0.1, which corresponds to a shock propagation velocity of about 1570 km s(-1). From the shock properties, we estimate that core-passage will occur in 0.3-0.6 Gyr and that the age of the shock structure is 50-100 Myr. Based on the measured properties of the ICM at the bridge and estimation of timescales, we find indications for non-equilibrium ionization. We also discover possible diffuse radio emission located between the merging clusters. Combining the radio, X-ray, and optical image data, we speculate that the detected radio sources are most likely related to the merger event. Thus, 1E2216.0-0401 and 1E2215.7-0404 is a new example of an early phase cluster merger with remarkable characteristics.
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页数:5
相关论文
共 54 条
  • [1] Hydrodynamic Simulations of Merging Galaxy Clusters: Non-Equilibrium Ionization State and Two-Temperature Structure
    Akahori, Takuya
    Yoshikawa, Kohji
    [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2010, 62 (02) : 335 - 345
  • [2] Systematic X-Ray Analysis of Radio Relic Clusters with Suzaku
    Akamatsu, Hiroki
    Kawahara, Hajime
    [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2013, 65 (01)
  • [3] Cosmological Parameters from Observations of Galaxy Clusters
    Allen, Steven W.
    Evrard, August E.
    Mantz, Adam B.
    [J]. ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, VOL 49, 2011, 49 : 409 - 470
  • [4] [Anonymous], 1956, Physics of Fully Ionized Gases
  • [5] THE FIRST SURVEY - FAINT IMAGES OF THE RADIO SKY AT 20 CENTIMETERS
    BECKER, RH
    WHITE, RL
    HELFAND, DJ
    [J]. ASTROPHYSICAL JOURNAL, 1995, 450 (02) : 559 - 577
  • [6] An XMM-Newton observation of the dynamically active binary cluster A1750
    Belsole, E
    Pratt, GW
    Sauvageot, JL
    Bourdin, H
    [J]. ASTRONOMY & ASTROPHYSICS, 2004, 415 (03) : 821 - 838
  • [7] SHOCK HEATING OF THE MERGING GALAXY CLUSTER A521
    Bourdin, H.
    Mazzotta, P.
    Markevitch, M.
    Giacintucci, S.
    Brunetti, G.
    [J]. ASTROPHYSICAL JOURNAL, 2013, 764 (01)
  • [8] COSMIC RAYS IN GALAXY CLUSTERS AND THEIR NONTHERMAL EMISSION
    Brunetti, Gianfranco
    Jones, Thomas W.
    [J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS D, 2014, 23 (04):
  • [9] PROBING THE OUTSKIRTS OF THE EARLY-STAGE GALAXY CLUSTER MERGER A1750
    Bulbul, Esra
    Randall, Scott W.
    Bayliss, Matthew
    Miller, Eric
    Andrade-Santos, Felipe
    Johnson, Ryan
    Bautz, Mark
    Blanton, Elizabeth L.
    Forman, William R.
    Jones, Christine
    Paterno-Mahler, Rachel
    Murray, Stephen S.
    Sarazin, Craig L.
    Smith, Randall K.
    Ezer, Cemile
    [J]. ASTROPHYSICAL JOURNAL, 2016, 818 (02)
  • [10] CASH W, 1979, ASTROPHYS J, V228, P939, DOI 10.1086/156922