First detection at 5.5 and 9 GHz of the radio relics in bullet cluster with ATCA

Original Article

Abstract

We present here results from observations at 5.5 and 9 GHz of the Bullet cluster 1E 0657–55.8 with the Australia Telescope Compact Array (ATCA). Our results show detection of diffuse emission in the cluster. Our findings are consistent with the previous observations by Shimwell et al. (2014, 2015) at 1.1–3.1 GHz. Morphology of diffuse structures (relic regions A and B and the radio halo) are consistent with those reported by the previous study. Our results indicate steepening in the spectral index at higher frequencies (\(\gtrsim5.0~\mbox{GHz}\)) for region A. The spectrum can be fit well by a broken power law. We discuss the possibility of a few recent theoretical models explaining this break in the power law spectrum, and find that a modified Diffusive Shock Acceleration (DSA) model or a turbulent reacceleration model may be relevant. Deep radio observations at high frequencies (\(\gtrsim5~\mbox{GHz}\)) are required for a detailed comparison with this model.

Keywords

Cosmic microwave background Galaxies: clusters: individual (1E 0657–56, RX J0658–5557) Intergalactic medium Radio continuum: general Techniques: interferometric 

References

  1. Brunetti, G., Jones, T.W.: Int. J. Mod. Phys. D 23, 30007 (2014). arXiv:1401.7519. doi:10.1142/S0218271814300079 ADSCrossRefGoogle Scholar
  2. Clowe, D., Bradač, M., Gonzalez, A.H., Markevitch, M., Randall, S.W., Jones, C., Zaritsky, D.: Astrophys. J. Lett. 648, 109 (2006). arXiv:astro-ph/0608407. doi:10.1086/508162 ADSCrossRefGoogle Scholar
  3. Datta, A., Schenck, D.E., Burns, J.O., Skillman, S.W., Hallman, E.J.: Astrophys. J. 793, 80 (2014). arXiv:1408.5123. doi:10.1088/0004-637X/793/2/80 ADSCrossRefGoogle Scholar
  4. Drury, L.O.: Rep. Prog. Phys. 46, 973 (1983). doi:10.1088/0034-4885/46/8/002 ADSCrossRefGoogle Scholar
  5. Ensslin, T.A., Biermann, P.L., Klein, U., Kohle, S.: Astron. Astrophys. 332, 395 (1998). arXiv:astro-ph/9712293 ADSGoogle Scholar
  6. Feretti, L., Giovannini, G., Govoni, F., Murgia, M.: Astron. Astrophys. Rev. 20, 54 (2012). arXiv:1205.1919. doi:10.1007/s00159-012-0054-z ADSCrossRefGoogle Scholar
  7. Fujita, Y., Takizawa, M., Yamazaki, R., Akamatsu, H., Ohno, H.: Astrophys. J. 815, 116 (2015). arXiv:1511.01897. doi:10.1088/0004-637X/815/2/116 ADSCrossRefGoogle Scholar
  8. Halverson, N.W., Lanting, T., Ade, P.A.R., Basu, K., Bender, A.N., Benson, B.A., Bertoldi, F., Cho, H., Chon, G., Clarke, J., Dobbs, M., Ferrusca, D., Güsten, R., Holzapfel, W.L., Kovács, A., Kennedy, J., Kermish, Z., Kneissl, R., Lee, A.T., Lueker, M., Mehl, J., Menten, K.M., Muders, D., Nord, M., Pacaud, F., Plagge, T., Reichardt, C., Richards, P.L., Schaaf, R., Schilke, P., Schuller, F., Schwan, D., Spieler, H., Tucker, C., Weiss, A., Zahn, O.: Astrophys. J. 701, 42 (2009). arXiv:0807.4208. doi:10.1088/0004-637X/701/1/42 ADSCrossRefGoogle Scholar
  9. Kang, H.: J. Korean Astron. Soc. 48, 9 (2015). arXiv:1411.7513. doi:10.5303/JKAS.2015.48.1.9 ADSCrossRefGoogle Scholar
  10. Kang, H.: ArXiv e-prints (2016). arXiv:1603.07444
  11. Kang, H., Ryu, D.: Astrophys. J. 809(2), 186 (2015) ADSCrossRefGoogle Scholar
  12. Kang, H., Ryu, D.: Astrophys. J. 823(1), 13 (2016) ADSCrossRefGoogle Scholar
  13. Liang, H., Hunstead, R.W., Birkinshaw, M., Andreani, P.: Astrophys. J. 544, 686 (2000). arXiv:astro-ph/0006072. doi:10.1086/317223 ADSCrossRefGoogle Scholar
  14. Malu, S.S., Subrahmanyan, R.: J. Astrophys. Astron. 32, 541 (2011). doi:10.1007/s12036-011-9111-7 ADSCrossRefGoogle Scholar
  15. Malu, S.S., Subrahmanyan, R., Wieringa, M., Narasimha, D.: ArXiv e-prints (2010). arXiv:1005.1394
  16. Owers, M.S., Nulsen, P.E.J., Couch, W.J., Markevitch, M.: Astrophys. J. 704, 1349 (2009). arXiv:0909.2645. doi:10.1088/0004-637X/704/2/1349 ADSCrossRefGoogle Scholar
  17. Plagge, T., Benson, B.A., Ade, P.A.R., Aird, K.A., Bleem, L.E., Carlstrom, J.E., Chang, C.L., Cho, H.-M., Crawford, T.M., Crites, A.T., de Haan, T., Dobbs, M.A., George, E.M., Hall, N.R., Halverson, N.W., Holder, G.P., Holzapfel, W.L., Hrubes, J.D., Joy, M., Keisler, R., Knox, L., Lee, A.T., Leitch, E.M., Lueker, M., Marrone, D., McMahon, J.J., Mehl, J., Meyer, S.S., Mohr, J.J., Montroy, T.E., Padin, S., Pryke, C., Reichardt, C.L., Ruhl, J.E., Schaffer, K.K., Shaw, L., Shirokoff, E., Spieler, H.G., Stalder, B., Staniszewski, Z., Stark, A.A., Vanderlinde, K., Vieira, J.D., Williamson, R., Zahn, O.: Astrophys. J. 716, 1118 (2010). arXiv:0911.2444. doi:10.1088/0004-637X/716/2/1118 ADSCrossRefGoogle Scholar
  18. Reynolds, J.E.: A revised flux scale for the at compact array. Technical Report 39.3/040, ATNF Technical Document Series (1994). http://www.atnf.csiro.au/observers/memos/
  19. Sarazin, C.L.: X-ray Emission from Clusters of Galaxies (1988) Google Scholar
  20. Sault, R.J., Staveley-Smith, L., Brouw, W.N.: Astron. Astrophys. Suppl. Ser. 120, 375 (1996) ADSCrossRefGoogle Scholar
  21. Sault, R.J.: ATCA flux density scale at 12 mm. Technical Report 39.3/124, ATNF Technical Document Series (2003). http://www.atnf.csiro.au/observers/memos/
  22. Shimwell, T.W., Brown, S., Feain, I.J., Feretti, L., Gaensler, B.M., Lage, C.: Deep radio observations of the radio halo of the bullet cluster 1e 0657-55.8 (2014). doi:10.1093/mnras/stu467
  23. Shimwell, T.W., Markevitch, M., Brown, S., Feretti, L., Gaensler, B.M., Johnston-Hollitt, M., Lage, C., Srinivasan, R.: Another shock for the bullet cluster, and the source of seed electrons for radio relics (2015). arXiv:1502.01064. doi:10.1093/mnras/stv334
  24. Siemieniec-Ozieblo, G.: Acta Phys. Pol. B 35, 2131 (2004). arXiv:astro-ph/0404375 ADSGoogle Scholar
  25. Stroe, A., Rumsey, C., Harwood, J.J., van Weeren, R.J., Röttgering, H.J.A., Saunders, R.D.E., Sobral, D., Perrott, Y.C., Schammel, M.P.: Mon. Not. R. Astron. Soc. 441, 41 (2014). arXiv:1403.4255. doi:10.1093/mnrasl/slu045 ADSCrossRefGoogle Scholar
  26. Stroe, A., Shimwell, T., Rumsey, C., van Weeren, R., Kierdorf, M., Donnert, J., Jones, T.W., Röttgering, H.J.A., Hoeft, M., Rodríguez-Gonzálvez, C., Harwood, J.J., Saunders, R.D.E.: Mon. Not. R. Astron. Soc. 455, 2402 (2016). arXiv:1510.06739. doi:10.1093/mnras/stv2472 ADSCrossRefGoogle Scholar
  27. Subrahmanyan, R., Kesteven, M.J., Ekers, R.D., Sinclair, M., Silk, J.: Mon. Not. R. Astron. Soc. 315, 808 (2000). arXiv:astro-ph/0002467. doi:10.1046/j.1365-8711.2000.03444.x ADSCrossRefGoogle Scholar
  28. van Weeren, R.J., Röttgering, H.J.A., Brüggen, M., Hoeft, M.: Science 330, 347 (2010). arXiv:1010.4306. doi:10.1126/science.1194293 ADSCrossRefGoogle Scholar
  29. van Weeren, R.J., Röttgering, H.J.A., Intema, H.T., Rudnick, L., Brüggen, M., Hoeft, M., Oonk, J.B.R.: Astron. Astrophys. 546, 124 (2012). arXiv:1209.2196. doi:10.1051/0004-6361/201219000 CrossRefGoogle Scholar
  30. Wilson, W.E., Ferris, R.H., Axtens, P., Brown, A., Davis, E., Hampson, G., Leach, M., Roberts, P., Saunders, S., Koribalski, B.S., Caswell, J.L., Lenc, E., Stevens, J., Voronkov, M.A., Wieringa, M.H., Brooks, K., Edwards, P.G., Ekers, R.D., Emonts, B., Hindson, L., Johnston, S., Maddison, S.T., Mahony, E.K., Malu, S.S., Massardi, M., Mao, M.Y., McConnell, D., Norris, R.P., Schnitzeler, D., Subrahmanyan, R., Urquhart, J.S., Thompson, M.A., Wark, R.M.: Mon. Not. R. Astron. Soc. 416, 832 (2011). arXiv:1105.3532. doi:10.1111/j.1365-2966.2011.19054.x ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  1. 1.Centre of AstronomyIndian Institute of Technology IndoreIndoreIndia
  2. 2.Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary ScienceUniversity of ColoradoBoulderUSA
  3. 3.Physics DepartmentIndian Institute of Technology IndoreIndoreIndia

Personalised recommendations