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Detection of the characteristic pion-decay signature in supernova remnants

Cosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) are the sources of galactic cosmic rays, unequivocal evidence for the acceleration of protons in these objects is still lacking. When accelerated protons encounter int... Full description

Journal Title: Science (New York N.Y.), 15 February 2013, Vol.339(6121), pp.807-11
Main Author: Ackermann, M
Other Authors: 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 , Falletti, L , Favuzzi, C , Ferrara, E C , Franckowiak, A , Fukazawa, Y , Funk, S , Fusco, P , Gargano, F , Germani, S , Giglietto, N , Giommi, P , Giordano, F , Giroletti, M , Glanzman, T , Godfrey, G , Grenier, I A , Grondin, M-H , Grove, J E , Guiriec, S , Hadasch, D , Hanabata, Y , Harding, A K , Hayashida, M , Hayashi, K , Hays, E , Hewitt, J W , Hill, A B , Hughes, R E , Jackson, M S , Jogler, T , Jóhannesson, G , Johnson, A S , Kamae, T , Kataoka, J , Katsuta, J , Knödlseder, J , Kuss, M , Lande, J , Larsson, S , Latronico, L , Lemoine-Goumard, M , Longo, F , Loparco, F , Lovellette, M N , Lubrano, P , Madejski, G M , Massaro, F , Mayer, M , Mazziotta, M N , Mcenery, J E , Mehault, J , Michelson, P F , Mignani, R P , Mitthumsiri, W , Mizuno, T , Moiseev, A A , Monzani, M E , Morselli, A , Moskalenko, I V , Murgia, S , Nakamori, T , Nemmen, R , Nuss, E , Ohno, M , Ohsugi, T , Omodei, N , Orienti, M , Orlando, E , Ormes, J F , Paneque, D , Perkins, J S , Pesce-Rollins, M , Piron, F , Pivato, G , Rainò, S , Rando, R , Razzano, M , Razzaque, S , Reimer, A , Reimer, O , Ritz, S , Romoli, C , Sánchez-Conde, M , Schulz, A , Sgrò, C , Simeon, P E , Siskind, E J , Smith, D A , Spandre, G , Spinelli, P , Stecker, F W , Strong, A W , Suson, D J , Tajima, H , Takahashi, H , Takahashi, T , Tanaka, T , Thayer, J G , Thayer, J B , Thompson, D J , Thorsett, S E , Tibaldo, L , Tibolla, O , Tinivella, M , Troja, E , Uchiyama, Y , Usher, T L , Vandenbroucke, J , Vasileiou, V , Vianello, G , Vitale, V , Waite, A P , Werner, M , Winer, B L , Wood, K S , Wood, M , Yamazaki, R , Yang, Z , Zimmer, S
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1095-9203 ; PMID: 23413352 Version:1 ; DOI: 10.1126/science.1231160
Link: http://pubmed.gov/23413352
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title: Detection of the characteristic pion-decay signature in supernova remnants
format: Article
creator:
  • 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
  • Falletti, L
  • Favuzzi, C
  • Ferrara, E C
  • Franckowiak, A
  • Fukazawa, Y
  • Funk, S
  • Fusco, P
  • Gargano, F
  • Germani, S
  • Giglietto, N
  • Giommi, P
  • Giordano, F
  • Giroletti, M
  • Glanzman, T
  • Godfrey, G
  • Grenier, I A
  • Grondin, M-H
  • Grove, J E
  • Guiriec, S
  • Hadasch, D
  • Hanabata, Y
  • Harding, A K
  • Hayashida, M
  • Hayashi, K
  • Hays, E
  • Hewitt, J W
  • Hill, A B
  • Hughes, R E
  • Jackson, M S
  • Jogler, T
  • Jóhannesson, G
  • Johnson, A S
  • Kamae, T
  • Kataoka, J
  • Katsuta, J
  • Knödlseder, J
  • Kuss, M
  • Lande, J
  • Larsson, S
  • Latronico, L
  • Lemoine-Goumard, M
  • Longo, F
  • Loparco, F
  • Lovellette, M N
  • Lubrano, P
  • Madejski, G M
  • Massaro, F
  • Mayer, M
  • Mazziotta, M N
  • Mcenery, J E
  • Mehault, J
  • Michelson, P F
  • Mignani, R P
  • Mitthumsiri, W
  • Mizuno, T
  • Moiseev, A A
  • Monzani, M E
  • Morselli, A
  • Moskalenko, I V
  • Murgia, S
  • Nakamori, T
  • Nemmen, R
  • Nuss, E
  • Ohno, M
  • Ohsugi, T
  • Omodei, N
  • Orienti, M
  • Orlando, E
  • Ormes, J F
  • Paneque, D
  • Perkins, J S
  • Pesce-Rollins, M
  • Piron, F
  • Pivato, G
  • Rainò, S
  • Rando, R
  • Razzano, M
  • Razzaque, S
  • Reimer, A
  • Reimer, O
  • Ritz, S
  • Romoli, C
  • Sánchez-Conde, M
  • Schulz, A
  • Sgrò, C
  • Simeon, P E
  • Siskind, E J
  • Smith, D A
  • Spandre, G
  • Spinelli, P
  • Stecker, F W
  • Strong, A W
  • Suson, D J
  • Tajima, H
  • Takahashi, H
  • Takahashi, T
  • Tanaka, T
  • Thayer, J G
  • Thayer, J B
  • Thompson, D J
  • Thorsett, S E
  • Tibaldo, L
  • Tibolla, O
  • Tinivella, M
  • Troja, E
  • Uchiyama, Y
  • Usher, T L
  • Vandenbroucke, J
  • Vasileiou, V
  • Vianello, G
  • Vitale, V
  • Waite, A P
  • Werner, M
  • Winer, B L
  • Wood, K S
  • Wood, M
  • Yamazaki, R
  • Yang, Z
  • Zimmer, S
subjects:
  • Supernovae
  • Cosmic Rays
  • Astrophysics
  • Gamma Ray Astronomy
ispartof: Science (New York, N.Y.), 15 February 2013, Vol.339(6121), pp.807-11
description: Cosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) are the sources of galactic cosmic rays, unequivocal evidence for the acceleration of protons in these objects is still lacking. When accelerated protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma rays. This offers a compelling way to detect the acceleration sites of protons. The identification of pion-decay gamma rays has been difficult because high-energy electrons also produce gamma rays via bremsstrahlung and inverse Compton scattering. We detected the characteristic pion-decay feature in the gamma-ray spectra of two SNRs, IC 443 and W44, with the Fermi Large Area Telescope. This detection provides direct evidence that cosmic-ray protons are accelerated in SNRs.
language: eng
source:
identifier: E-ISSN: 1095-9203 ; PMID: 23413352 Version:1 ; DOI: 10.1126/science.1231160
fulltext: fulltext
issn:
  • 10959203
  • 1095-9203
url: Link


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titleDetection of the characteristic pion-decay signature in supernova remnants
creatorAckermann, 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 ; Falletti, L ; Favuzzi, C ; Ferrara, E C ; Franckowiak, A ; Fukazawa, Y ; Funk, S ; Fusco, P ; Gargano, F ; Germani, S ; Giglietto, N ; Giommi, P ; Giordano, F ; Giroletti, M ; Glanzman, T ; Godfrey, G ; Grenier, I A ; Grondin, M-H ; Grove, J E ; Guiriec, S ; Hadasch, D ; Hanabata, Y ; Harding, A K ; Hayashida, M ; Hayashi, K ; Hays, E ; Hewitt, J W ; Hill, A B ; Hughes, R E ; Jackson, M S ; Jogler, T ; Jóhannesson, G ; Johnson, A S ; Kamae, T ; Kataoka, J ; Katsuta, J ; Knödlseder, J ; Kuss, M ; Lande, J ; Larsson, S ; Latronico, L ; Lemoine-Goumard, M ; Longo, F ; Loparco, F ; Lovellette, M N ; Lubrano, P ; Madejski, G M ; Massaro, F ; Mayer, M ; Mazziotta, M N ; Mcenery, J E ; Mehault, J ; Michelson, P F ; Mignani, R P ; Mitthumsiri, W ; Mizuno, T ; Moiseev, A A ; Monzani, M E ; Morselli, A ; Moskalenko, I V ; Murgia, S ; Nakamori, T ; Nemmen, R ; Nuss, E ; Ohno, M ; Ohsugi, T ; Omodei, N ; Orienti, M ; Orlando, E ; Ormes, J F ; Paneque, D ; Perkins, J S ; Pesce-Rollins, M ; Piron, F ; Pivato, G ; Rainò, S ; Rando, R ; Razzano, M ; Razzaque, S ; Reimer, A ; Reimer, O ; Ritz, S ; Romoli, C ; Sánchez-Conde, M ; Schulz, A ; Sgrò, C ; Simeon, P E ; Siskind, E J ; Smith, D A ; Spandre, G ; Spinelli, P ; Stecker, F W ; Strong, A W ; Suson, D J ; Tajima, H ; Takahashi, H ; Takahashi, T ; Tanaka, T ; Thayer, J G ; Thayer, J B ; Thompson, D J ; Thorsett, S E ; Tibaldo, L ; Tibolla, O ; Tinivella, M ; Troja, E ; Uchiyama, Y ; Usher, T L ; Vandenbroucke, J ; Vasileiou, V ; Vianello, G ; Vitale, V ; Waite, A P ; Werner, M ; Winer, B L ; Wood, K S ; Wood, M ; Yamazaki, R ; Yang, Z ; Zimmer, S
ispartofScience (New York, N.Y.), 15 February 2013, Vol.339(6121), pp.807-11
identifier
descriptionCosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) are the sources of galactic cosmic rays, unequivocal evidence for the acceleration of protons in these objects is still lacking. When accelerated protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma rays. This offers a compelling way to detect the acceleration sites of protons. The identification of pion-decay gamma rays has been difficult because high-energy electrons also produce gamma rays via bremsstrahlung and inverse Compton scattering. We detected the characteristic pion-decay feature in the gamma-ray spectra of two SNRs, IC 443 and W44, with the Fermi Large Area Telescope. This detection provides direct evidence that cosmic-ray protons are accelerated in SNRs.
languageeng
source
subjectSupernovae ; Cosmic Rays ; Astrophysics ; Gamma Ray Astronomy;
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0Ackermann, M
1Ajello, M
2Allafort, A
3Baldini, L
4Ballet, J
5Barbiellini, G
6Baring, M G
7Bastieri, D
8Bechtol, K
9Bellazzini, R
10Blandford, R D
11Bloom, E D
12Bonamente, E
13Borgland, A W
14Bottacini, E
15Brandt, T J
16Bregeon, J
17Brigida, M
18Bruel, P
19Buehler, R
20Busetto, G
21Buson, S
22Caliandro, G A
23Cameron, R A
24Caraveo, P A
25Casandjian, J M
26Cecchi, C
27Celik, O
28Charles, E
29Chaty, S
30Chaves, R C G
31Chekhtman, A
32Cheung, C C
33Chiang, J
34Chiaro, G
35Cillis, A N
36Ciprini, S
37Claus, R
38Cohen-Tanugi, J
39Cominsky, L R
40Conrad, J
41Corbel, S
42Cutini, S
43D'Ammando, F
44de Angelis, A
45de Palma, F
46Dermer, C D
47do Couto e Silva, E
48Drell, P S
49Drlica-Wagner, A
50Falletti, L
51Favuzzi, C
52Ferrara, E C
53Franckowiak, A
54Fukazawa, Y
55Funk, S
56Fusco, P
57Gargano, F
58Germani, S
59Giglietto, N
60Giommi, P
61Giordano, F
62Giroletti, M
63Glanzman, T
64Godfrey, G
65Grenier, I A
66Grondin, M-H
67Grove, J E
68Guiriec, S
69Hadasch, D
70Hanabata, Y
71Harding, A K
72Hayashida, M
73Hayashi, K
74Hays, E
75Hewitt, J W
76Hill, A B
77Hughes, R E
78Jackson, M S
79Jogler, T
80Jóhannesson, G
81Johnson, A S
82Kamae, T
83Kataoka, J
84Katsuta, J
85Knödlseder, J
86Kuss, M
87Lande, J
88Larsson, S
89Latronico, L
90Lemoine-Goumard, M
91Longo, F
92Loparco, F
93Lovellette, M N
94Lubrano, P
95Madejski, G M
96Massaro, F
97Mayer, M
98Mazziotta, M N
99McEnery, J E
100...
titleDetection of the characteristic pion-decay signature in supernova remnants
descriptionCosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) are the sources of galactic cosmic rays, unequivocal evidence for the acceleration of protons in these objects is still lacking. When accelerated protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma rays. This offers a compelling way to detect the acceleration sites of protons. The identification of pion-decay gamma rays has been difficult because high-energy electrons also produce gamma rays via bremsstrahlung and inverse Compton scattering. We detected the characteristic pion-decay feature in the gamma-ray spectra of two SNRs, IC 443 and W44, with the Fermi Large Area Telescope. This detection provides direct evidence that cosmic-ray protons are accelerated in SNRs.
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titleDetection of the characteristic pion-decay signature in supernova remnants
authorAckermann, 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 ; Falletti, L ; Favuzzi, C ; Ferrara, E C ; Franckowiak, A ; Fukazawa, Y ; Funk, S ; Fusco, P ; Gargano, F ; Germani, S ; Giglietto, N ; Giommi, P ; Giordano, F ; Giroletti, M ; Glanzman, T ; Godfrey, G ; Grenier, I A ; Grondin, M-H ; Grove, J E ; Guiriec, S ; Hadasch, D ; Hanabata, Y ; Harding, A K ; Hayashida, M ; Hayashi, K ; Hays, E ; Hewitt, J W ; Hill, A B ; Hughes, R E ; Jackson, M S ; Jogler, T ; Jóhannesson, G ; Johnson, A S ; Kamae, T ; Kataoka, J ; Katsuta, J ; Knödlseder, J ; Kuss, M ; Lande, J ; Larsson, S ; Latronico, L ; Lemoine-Goumard, M ; Longo, F ; Loparco, F ; Lovellette, M N ; Lubrano, P ; Madejski, G M ; Massaro, F ; Mayer, M ; Mazziotta, M N ; Mcenery, J E ; Mehault, J ; Michelson, P F ; Mignani, R P ; Mitthumsiri, W ; Mizuno, T ; Moiseev, A A ; Monzani, M E ; Morselli, A ; Moskalenko, I V ; Murgia, S ; Nakamori, T ; Nemmen, R ; Nuss, E ; Ohno, M ; Ohsugi, T ; Omodei, N ; Orienti, M ; Orlando, E ; Ormes, J F ; Paneque, D ; Perkins, J S ; Pesce-Rollins, M ; Piron, F ; Pivato, G ; Rainò, S ; Rando, R ; Razzano, M ; Razzaque, S ; Reimer, A ; Reimer, O ; Ritz, S ; Romoli, C ; Sánchez-Conde, M ; Schulz, A ; Sgrò, C ; Simeon, P E ; Siskind, E J ; Smith, D A ; Spandre, G ; Spinelli, P ; Stecker, F W ; Strong, A W ; Suson, D J ; Tajima, H ; Takahashi, H ; Takahashi, T ; Tanaka, T ; Thayer, J G ; Thayer, J B ; Thompson, D J ; Thorsett, S E ; Tibaldo, L ; Tibolla, O ; Tinivella, M ; Troja, E ; Uchiyama, Y ; Usher, T L ; Vandenbroucke, J ; Vasileiou, V ; Vianello, G ; Vitale, V ; Waite, A P ; Werner, M ; Winer, B L ; Wood, K S ; Wood, M ; Yamazaki, R ; Yang, Z ; Zimmer, S
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8Bechtol, K
9Bellazzini, R
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12Bonamente, E
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19Buehler, R
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29Chaty, S
30Chaves, R C G
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38Cohen-Tanugi, J
39Cominsky, L R
40Conrad, J
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47Do Couto E Silva, E
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53Franckowiak, A
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57Gargano, F
58Germani, S
59Giglietto, N
60Giommi, P
61Giordano, F
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66Grondin, M-H
67Grove, J E
68Guiriec, S
69Hadasch, D
70Hanabata, Y
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72Hayashida, M
73Hayashi, K
74Hays, E
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87Lande, J
88Larsson, S
89Latronico, L
90Lemoine-Goumard, M
91Longo, F
92Loparco, F
93Lovellette, M N
94Lubrano, P
95Madejski, G M
96Massaro, F
97Mayer, M
98Mazziotta, M N
99Mcenery, J E
100...
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68Guiriec
69Hadasch
70Hanabata
71Harding
72Hayashida
73Hayashi
74Hays
75Hewitt
76Hill
77Hughes
78Jackson
79Jogler
80Jóhannesson
81Johnson
82Kamae
83Kataoka
84Katsuta
85Knödlseder
86Kuss
87Lande
88Larsson
89Latronico
90Lemoine-Goumard
91Longo
92Loparco
93Lovellette
94Lubrano
95Madejski
96Massaro
97Mayer
98Mazziotta
99Mcenery
100...
aufirst
0M
1A
2L
3J
4G
5M G
6D
7K
8R
9R D
10E D
11E
12A W
13T J
14P
15S
16G A
17R A
18P A
19J M
20C
21O
22R C G
23C C
24A N
25L R
26F
27C D
28P S
29E C
30Y
31N
32T
33I A
34M-H
35J E
36A K
37J W
38A B
39R E
40M S
41A S
42M N
43G M
44P F
45R P
46W
47A A
48M E
49I V
50J F
51J S
52P E
53E J
54D A
55F W
56D J
57H
58J G
59J B
60S E
61T L
62V
63A P
64B L
65K S
66Z
au
0Ackermann, M
1Ajello, M
2Allafort, A
3Baldini, L
4Ballet, J
5Barbiellini, G
6Baring, M G
7Bastieri, D
8Bechtol, K
9Bellazzini, R
10Blandford, R D
11Bloom, E D
12Bonamente, E
13Borgland, A W
14Bottacini, E
15Brandt, T J
16Bregeon, J
17Brigida, M
18Bruel, P
19Buehler, R
20Busetto, G
21Buson, S
22Caliandro, G A
23Cameron, R A
24Caraveo, P A
25Casandjian, J M
26Cecchi, C
27Celik, O
28Charles, E
29Chaty, S
30Chaves, R C G
31Chekhtman, A
32Cheung, C C
33Chiang, J
34Chiaro, G
35Cillis, A N
36Ciprini, S
37Claus, R
38Cohen-Tanugi, J
39Cominsky, L R
40Conrad, J
41Corbel, S
42Cutini, S
43D'Ammando, F
44de Angelis, A
45de Palma, F
46Dermer, C D
47Do Couto E Silva, E
48Drell, P S
49Drlica-Wagner, A
50Falletti, L
51Favuzzi, C
52Ferrara, E C
53Franckowiak, A
54Fukazawa, Y
55Funk, S
56Fusco, P
57Gargano, F
58Germani, S
59Giglietto, N
60Giommi, P
61Giordano, F
62Giroletti, M
63Glanzman, T
64Godfrey, G
65Grenier, I A
66Grondin, M-H
67Grove, J E
68Guiriec, S
69Hadasch, D
70Hanabata, Y
71Harding, A K
72Hayashida, M
73Hayashi, K
74Hays, E
75Hewitt, J W
76Hill, A B
77Hughes, R E
78Jackson, M S
79Jogler, T
80Jóhannesson, G
81Johnson, A S
82Kamae, T
83Kataoka, J
84Katsuta, J
85Knödlseder, J
86Kuss, M
87Lande, J
88Larsson, S
89Latronico, L
90Lemoine-Goumard, M
91Longo, F
92Loparco, F
93Lovellette, M N
94Lubrano, P
95Madejski, G M
96Massaro, F
97Mayer, M
98Mazziotta, M N
99Mcenery, J E
100...
atitleDetection of the characteristic pion-decay signature in supernova remnants
jtitleScience (New York, N.Y.)
risdate20130215
volume339
issue6121
spage807
pages807-811
eissn1095-9203
formatjournal
genrearticle
ristypeJOUR
abstractCosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) are the sources of galactic cosmic rays, unequivocal evidence for the acceleration of protons in these objects is still lacking. When accelerated protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma rays. This offers a compelling way to detect the acceleration sites of protons. The identification of pion-decay gamma rays has been difficult because high-energy electrons also produce gamma rays via bremsstrahlung and inverse Compton scattering. We detected the characteristic pion-decay feature in the gamma-ray spectra of two SNRs, IC 443 and W44, with the Fermi Large Area Telescope. This detection provides direct evidence that cosmic-ray protons are accelerated in SNRs.
doi10.1126/science.1231160
pmid23413352
orcidid0000-0002-0014-7809: 0000-0001-6885-7156
issn00368075
oafree_for_read
date2013-02-15