Abstract
We present results on the spectroscopic analysis of XMM-Newton EPIC data of the central 0.5 h -150 Mpc regions of the clusters of galaxies Coma, A1795 and A3112. A significant warm emission component at a level above the systematic uncertainties is evident in the data and confirmed by ROSAT PSPC data for Coma and A1795. The non-thermal origin of the phenomenon cannot be ruled out at the current level of calibration accuracy, but the thermal model fits the data significantly better, with temperatures in the range of 0.6 – 1.3 keV and electron densities of the order of 10-4 – 10-3 cm-3. In the outer parts of the clusters the properties of the warm component are marginally consistent with the results of recent cosmological simulations, which predict a large fraction of the current epoch’s bayons located in a warm-hot intergalactic medium (WHIM). However, the derived densities are too high in the cluster cores, compared to WHIM simulations, and thus more theoretical work is needed to fully understand the origin of the observed soft X-ray excess.
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References
Berghoefer, T.W. and Bowyer, S. 2002, ApJ, 565, L17
Bonamente, M., Lieu, R., Joy, M. & Nevalainen, J., 2002, ApJ, 576, 688
Bonamente, M., Lieu, R. & Mittaz, J., 2001a, ApJl, 547,7
Bonamente, M., Lieu, R. & Mittaz, J., 2001b, ApJL, 561, 63
Bonamente, M., Lieu, R., Nevalainen, J & Kaastra, J., 2001c, ApJL, 552, 7
Bonamente, M., Lieu, R. & Mittaz, J., 2001d, ApJ, 546, 805
Bowyer, S., Berghoefer, T.W. and Korpela, E.J. 1999, ApJ, 526, 592
Buote, D., 2001, ApJ, 548, 652
Cen, R. & Ostriker, J., 1999, ApJ, 514, 1
Cen, R., Tripp, T., Ostriker, J. & Jenkins, E., 2001, ApJL, 559, 5
Dave, R., Cen, R., Ostriker, J. et al., 2001, ApJ, 552, 473
De Grandi S., & Molendi, S., 2002, ApJ, 567, 163
Dickey, J. & Lockman, F, 1990, ARAA, 28, 215
Hwang, 1997, Sci 278, 1917
Kaastra, J., Lieu, R., Bleeker, J., Mewe, R. and Colafrancesco, S. 2002, ApJ, 574, LI
Kaastra, J., Lieu, R., Mittaz, J., Bleeker, J., Mewe, R., Colafrancesco, S. and Lockman, F 1999, ApJl, 519, LI 19
Lieu, R., Bonamente, M. and Mittaz, J.RD. 1999a, ApJl, 517, L91
Lieu, R., Bonamente, M., Mittaz, J.RD., Durret, F, Dos Santos, S. and Kaastra, J. 1999b, ApJl, 527,L77
Lieu, R., Mittaz, J.P.D., Bowyer, S., Lockman, F.J., Hwang, C. -Y, Schmitt, J.H.M.M. 1996a, ApJl, 458, L5
Lieu, R., Mittaz, J.P.D., Bowyer, S., Breen, J.O., Lockman, FJ., Murphy, E.M. & Hwang, C. -Y 1996b, Science, 274,1335
Lieu, R., Axford, W. & Bonamente, M., 1999, ApJL, 510, 25
Lumb, D., Warwick, R., Page, M., De Luca, A., 2002, A&A, 389, 93L
Mittaz, J.P.D., Lieu, R. and Lockman, F.J. 1998, ApJl, 498, L17
Mewe R., Kaastra J. & Liedahl D., 1995, “Update on meka: mekal”, Legacy 6, 16
Sarazin, C. & Lieu, R., 1998, ApJL, 494, 177
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© 2004 Springer Science+Business Media Dordrecht
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Nevalainen, J., Lieu, R., Bonamente, M., Lumb, D. (2004). Soft X-Ray Excess Emission in Three Clusters of Galaxies Observed with XMM-Newton. In: Lieu, R., Mittaz, J. (eds) Soft X-Ray Emission from Clusters of Galaxies and Related Phenomena. Astrophysics and Space Science Library, vol 309. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-2564-8_4
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DOI: https://doi.org/10.1007/978-1-4020-2564-8_4
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