Discovery of recombining plasma from the faintest GeV supernova remnant HB 21 and a possible scenario for cosmic rays escaping from supernova remnant shocks

被引：15

作者：

Suzuki, Hiromasa ^{[1
]}

Bamba, Aya ^{[1
,2
]}

Nakazawa, Kazuhiro ^{[1
,2
]}

Furuta, Yoshihiro ^{[1
]}

Sawada, Makoto ^{[3
,4
,5
]}

Yamazaki, Ryo ^{[3
]}

Koyama, Katsuji ^{[6
]}

机构：

[1] Univ Tokyo, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[2] Univ Tokyo, Sch Sci, Res Ctr Early Univ, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[3] Aoyama Gakuin Univ, Dept Math & Phys, Chuo Ku, 5-10-1 Fuchinobe, Sagamihara, Kanagawa 2525258, Japan

[4] NASA, Goddard Space Flight Ctr, Xray Astrophys Lab, Greenbelt, MD 20771 USA

[5] Univ Maryland Baltimore Cty, Dept Phys, 1000 Hilltop Circle, Baltimore, MD 21250 USA

[6] Kyoto Univ, Dept Phys, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto, Kyoto 6068502, Japan

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2018年 / 70卷 / 04期

关键词：

acceleration of particles; ISM: individual objects (HB 21); ISM: supernova remnants; X-rays: ISM; X-RAY; GALACTIC-CENTER; OH MASERS; EMISSION; ABSORPTION; SPECTRA; ACCELERATION; CONTINUUM; CLOUDS; GAS;

D O I：

10.1093/pasj/psy069

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an X-ray study of the GeV gamma-ray supernova remnant (SNR) HB 21 with Suzaku. HB 21 is interacting with molecular clouds, and is the faintest in the GeV band among known GeV SNRs. We discovered strong radiative recombination continua of Si and S from the center of the remnant, which provide direct evidence of a recombining plasma (RP). The total emission can be explained with the RP and ionizing plasma components. The electron temperature and recombination timescale of the RP component were estimated as 0.17 (0.15-0.18) keV and 3.2 (2.0-4.8) x 10(11) s cm(-3), respectively. The estimated age of the RP (similar to 170 kyr) is the longest among known recombining GeV SNRs, because of a very low density of electrons (similar to 0.05 cm(-3)). We have examined the dependencies of GeV spectral indices on each of RP ages and SNR diameters for nine recombining GeV SNRs. Both showed possible positive correlations, indicating that both the parameters can be good indicators of properties of accelerated protons, for instance the degree of escape from SNR shocks. A possible scenario for a process of proton escape is introduced: interaction with molecular clouds makes weaker magnetic turbulence and cosmic-ray protons escape, simultaneously cooling down the thermal electrons and generating an RP.

引用

页数：10

共 76 条

[1] FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE SUPERNOVA REMNANT W28 (G6.4-0.1) [J].

Abdo, A. A. ;

Ackermann, M. ;

Ajello, M. ;

Allafort, A. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Bechtol, K. ;

Bellazzini, R. ;

Berenji, B. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bouvier, A. ;

Brandt, T. J. ;

Bregeon, J. ;

Brigida, M. ;

Bruel, P. ;

Buehler, R. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Carrigan, S. ;

Casandjian, J. M. ;

Cecchi, C. ;

Celik, Oe. ;

Chekhtman, A. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Conrad, J. ;

Dermer, C. D. ;

de Palma, F. ;

do Couto e Silva, E. ;

Drell, P. S. ;

Dubois, R. ;

Dumora, D. ;

Farnier, C. ;

Favuzzi, C. ;

Fegan, S. J. ;

Fukazawa, Y. ;

Fukui, Y. ;

Funk, S. ;

Fusco, P. ;

Gargano, F. ;

Gehrels, N. .

ASTROPHYSICAL JOURNAL, 2010, 718 (01) :348-356

[2] THE FIRST FERMI LAT SUPERNOVA REMNANT CATALOG [J].

Acero, F. ;

Ackermann, M. ;

Ajello, M. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Bellazzini, R. ;

Bissaldi, E. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bonino, R. ;

Bottacini, E. ;

Brandt, T. J. ;

Bregeon, J. ;

Bruel, P. ;

Buehler, R. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caputo, R. ;

Caragiulo, M. ;

Caraveo, P. A. ;

Casandjian, J. M. ;

Cavazzuti, E. ;

Cecchi, C. ;

Chekhtman, A. ;

Chiang, J. ;

Chiaro, G. ;

Ciprini, S. ;

Claus, R. ;

Cohen, J. M. ;

Cohen-Tanugi, J. ;

Cominsky, L. R. ;

Condon, B. ;

Conrad, J. ;

Cutini, S. ;

D'Ammando, F. ;

de Angelis, A. ;

de Palma, F. ;

Desiante, R. ;

Digel, S. W. ;

Di Venere, L. ;

Drell, P. S. ;

Drlica-Wagner, A. ;

Favuzzi, C. ;

Ferrara, E. C. ;

Franckowiak, A. ;

Fukazawa, Y. ;

Funk, S. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2016, 224 (01)

[3] Detection of the Characteristic Pion-Decay Signature in Supernova Remnants [J].

Ackermann, M. ;

Ajello, M. ;

Allafort, A. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Baring, M. G. ;

Bastieri, D. ;

Bechtol, K. ;

Bellazzini, R. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bottacini, E. ;

Brandt, T. J. ;

Bregeon, J. ;

Brigida, M. ;

Bruel, P. ;

Buehler, R. ;

Busetto, G. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Casandjian, J. M. ;

Cecchi, C. ;

Celik, O. ;

Charles, E. ;

Chaty, S. ;

Chaves, R. C. G. ;

Chekhtman, A. ;

Cheung, C. C. ;

Chiang, J. ;

Chiaro, G. ;

Cillis, A. N. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Cominsky, L. R. ;

Conrad, J. ;

Corbel, S. ;

Cutini, S. ;

D'Ammando, F. ;

de Angelis, A. ;

de Palma, F. ;

Dermer, C. D. ;

do Couto e Silva, E. ;

Drell, P. S. ;

Drlica-Wagner, A. .

SCIENCE, 2013, 339 (6121) :807-811

[4] Detection of gamma-ray emission in the region of the supernova remnants G296.5+10.0 and G166.0+4.3 [J].

Araya, Miguel .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2013, 434 (03) :2202-2208

[5] MULTI-WAVELENGTH ANALYSIS OF THE GALACTIC SUPERNOVA REMNANT MSH 11-61A [J].

Auchettl, Katie ;

Slane, Patrick ;

Castro, Daniel ;

Foster, Adam R. ;

Smith, Randall K. .

ASTROPHYSICAL JOURNAL, 2015, 810 (01)

[6] PHOTOELECTRIC ABSORPTION CROSS-SECTIONS WITH VARIABLE ABUNDANCES [J].

BALUCINSKACHURCH, M ;

MCCAMMON, D .

ASTROPHYSICAL JOURNAL, 1992, 400 (02) :699-700

[7] Chandra observations of galactic supernova remnant Vela Jr.:: A new sample of thin filaments emitting synchrotron X-rays [J].

Bamba, A ;

Yamazaki, R ;

Hiraga, JS .

ASTROPHYSICAL JOURNAL, 2005, 632 (01) :294-301

[8] A spatial and spectral study of nonthermal filaments in historical supernova remnants:: Observational results with Chandra [J].

Bamba, A ;

Yamazaki, R ;

Yoshida, T ;

Terasawa, T ;

Koyama, K .

ASTROPHYSICAL JOURNAL, 2005, 621 (02) :793-802

[9] Small-scale structure of the SN 1006 shock with Chandra observations [J].

Bamba, A ;

Yamazaki, R ;

Ueno, M ;

Koyama, K .

ASTROPHYSICAL JOURNAL, 2003, 589 (02) :827-837

[10]

Bamba A., 2016, PASJ, V68, P5

← 1 2 3 4 5 6 7 8 →