「すざく」が暴いた激動の過去 ~超新星残骸における再結合プラズマの発見~
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(114) +,, &?@A B CDEF-G HI . ῎῍῏ῌ 1) 2) 3) 4). JK 2010, LMNO 103, 43 PQRS 2010, LMNO 103, 438 Mazzotta P., et al., 1998, A&AS 133, 403 T UVW 1995, XYZ[\]^_ `T abcdefgh Masai K., 1984, Ap&SS 98, 367 Hwang U., Hughes, J. P., Petre R., 1998, ApJ 497, 833 Yamaguchi H., et al., 2008, PASJ 60, S141 Katsuda S., et al., 2008, PASJ 60, S107 Kawashima K., Kitamoto S., 1996, PASJ 48, L113. 5) 6) 7) 8) 9) 10) Sugawara Y., Tsuboi Y., Maeda Y., 2008, A&A 490, 259 11) Nordon R., et al., 2009, ApJ 695, 834 12) Kawasaki M., et al., 2002, ApJ 572, 897 13) Kawasaki M., et al., 2005, ApJ 631, 935 14) Miceli M., et al., 2006, A&A 227, 191 15) Troja E., et al., 2008 A&A 485, 777 16) Ozawa M., et al., 2009, ApJ 706, L71 17) Keohane J. W., et al., 2007, ApJ 654, 938 18) Miceli M., et al., 2010, A&A 514, L2 19) Yamaguchi H., et al., 2009, ApJ 705, L6 20) Tsunemi H., et al., 1986, ApJ 306, 248 21) HI i 2010, jklM `mnoTh 22) Rho J., Petre R., 1998, ApJ 503, L167 23) LaRosa T. N., et al., 2000, AJ 119, 207 24) White R. L., Long K. S., 1991, ApJ 373, 543 25) Dwarkadas V. V., 2005, ApJ 630, 892 26) Itoh H., Masai K., 1989, MNRAS 236, 885. 66. Discovery of Recombining Plasma in Supernova Remnants Midori OZAWA1 and Hiroya YAMAGUCHI2 1 Kyoto University, Kitashirakawa oiwake-cho, Sakyo-ku, Kyoto 606ῌ8502, Japan; 2 RIKEN, 2ῌ1 Hirosawa, Wako-shi, Saitama 351ῌ0198, Japan Abstract : The initial ionization state of shockheated materials is nearly neutral for most supernova remnants (SNRs). Heated electrons subsequently collide with ions and gradually ionize them. Since the plasma density in SNRs is so low, it typically takes tens of thousands of years to reach ionization equilibrium. Therefore, it has been generally believed that almost all the SNRs are characterized by ionizing plasma. We have, however, discovered anomalously strong recombination X-rays from several SNRs by utilizing the excellent sensitivity of Suzaku. These X-rays are defintive evidence for recombining plasma that is not expected according to SNR evolution theories. Here we present our recent results and discuss the possible formation mechanisms of the recombining plasma in SNRs.. LMNO. 2011 p 2 N.
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