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FERMI LAT OBSERVATIONS OF LS I +61 deg 303: FIRST DETECTION OF AN ORBITAL MODULATION IN GeV GAMMA RAYS

This Letter presents the first results from the observations of LS I +61 deg 303 using Large Area Telescope data from the Fermi Gamma-Ray Space Telescope between 2008 August and 2009 March. Our results indicate variability that is consistent with the binary period, with the emission being modulated... Full description

Journal Title: Astrophysical Journal Letters Aug 2009, Vol.701(2), pp.L123-L128
Main Author: Abdo, A
Other Authors: Ackermann, M , Ajello, M , Atwood, W , Axelsson, M , Baldini, L , Ballet, J , Barbiellini, G , Bastieri, D , Baughman, B , Bechtol, K , Bellazzini, R , Berenji, B , Blandford, R , Bloom, E , Bonamente, E , Borgland, A , Bregeon, J , Brez, A , Brigida, M , Bruel, P , Burnett, T , Caliandro, G , Cameron, R , Caraveo, P , Casandjian, J , Cavazzuti, E , Cecchi, C , Celik, O , Charles, E , Chaty, S , Chekhtman, A , Cheung, C , Chiang, J , Ciprini, S , Claus, R , Cohen-Tanugi, J , Cominsky, L , Conrad, J , Corbel, S , Corbet, R , Cutini, S , Dermer, C , de Angelis, A , de Luca, A , de Palma, F , Digel, S , Dormody, M , Drell, P , Dubois, R , Dubus, G , Dumora, D , Farnier, C , Favuzzi, C , Fegan, S , Focke, W , Frailis, M , Fukazawa, Y , Funk, S , Fusco, P , Gargano, F , Gasparrini, D , Gehrels, N , Germani, S , Giebels, B , Giglietto, N , Giordano, F , Glanzman, T , Godfrey, G , Grenier, I , Grondin, M-H , Grove, J , Guillemot, L , Guiriec, S , Hanabata, Y , Harding, A , Hayashida, M , Hays, E , Hill, A , Hughes, R , Johannesson, G , Johnson, A , Johnson, R , Johnson, T , Johnson, W , Kamae, T , Katagiri, H , Kataoka, J , Kawai, N , Kerr, M , Knodlseder, J , Kocian, M , Kuehn, F , Kuss, M , Lande, J , Larsson, S , Latronico, L , Longo, F , Loparco, F , Lott, B , Lovellette, M , Lubrano, P , Madejski, G , Makeev, A , Marelli, M , Mazziotta, M , Mcenery, J , Meurer, C , Michelson, P , Mitthumsiri, W , Mizuno, T , Monte, C , Monzani, M , Morselli, A , Moskalenko, I , Murgia, S , Nolan, P , Nuss, E , Ohsugi, T , Okumura, A , Omodei, N , Orlando, E , Ormes, J , Paneque, D , Panetta, J , Parent, D , Pelassa, V , Pepe, M , Pesce-Rollins, M , Piron, F , Porter, T , Raino, S , Rando, R , Ray, P , Razzano, M , Rea, N , Reimer, A , Reimer, O , Reposeur, T , Ritz, S , Rochester, L , Rodriguez, A , Romani, R , Ryde, F , Sadrozinski, H , Sanchez, D , Sander, A , Scargle, J , Sgro, C , Shaw, M , Sierpowska-Bartosik, A , Siskind, E , Smith, D , Smith, P , Spandre, G , Spinelli, P , Striani, E , Strickman, M , Suson, D , Tajima, H , Takahashi, H , Takahashi, T , Tanaka, T , Thayer, J , Thayer, J , Thompson, D , Tibaldo, L , Torres, D , Tosti, G , Tramacere, A , Uchiyama, Y , Usher, T , Vasileiou, V , Vilchez, N , Vitale, V , Waite, A , Wang, P , Winer, B , Wood, K , Ylinen, T , Ziegler, M , Abdo, A
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 2041-8205 ; DOI: 10.1088/0004-637X/701/2/L123
Link: http://search.proquest.com/docview/21304681/?pq-origsite=primo
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title: FERMI LAT OBSERVATIONS OF LS I +61 deg 303: FIRST DETECTION OF AN ORBITAL MODULATION IN GeV GAMMA RAYS
format: Article
creator:
  • Abdo, A
  • Ackermann, M
  • Ajello, M
  • Atwood, W
  • Axelsson, M
  • Baldini, L
  • Ballet, J
  • Barbiellini, G
  • Bastieri, D
  • Baughman, B
  • Bechtol, K
  • Bellazzini, R
  • Berenji, B
  • Blandford, R
  • Bloom, E
  • Bonamente, E
  • Borgland, A
  • Bregeon, J
  • Brez, A
  • Brigida, M
  • Bruel, P
  • Burnett, T
  • Caliandro, G
  • Cameron, R
  • Caraveo, P
  • Casandjian, J
  • Cavazzuti, E
  • Cecchi, C
  • Celik, O
  • Charles, E
  • Chaty, S
  • Chekhtman, A
  • Cheung, C
  • Chiang, J
  • Ciprini, S
  • Claus, R
  • Cohen-Tanugi, J
  • Cominsky, L
  • Conrad, J
  • Corbel, S
  • Corbet, R
  • Cutini, S
  • Dermer, C
  • de Angelis, A
  • de Luca, A
  • de Palma, F
  • Digel, S
  • Dormody, M
  • Drell, P
  • Dubois, R
  • Dubus, G
  • Dumora, D
  • Farnier, C
  • Favuzzi, C
  • Fegan, S
  • Focke, W
  • Frailis, M
  • Fukazawa, Y
  • Funk, S
  • Fusco, P
  • Gargano, F
  • Gasparrini, D
  • Gehrels, N
  • Germani, S
  • Giebels, B
  • Giglietto, N
  • Giordano, F
  • Glanzman, T
  • Godfrey, G
  • Grenier, I
  • Grondin, M-H
  • Grove, J
  • Guillemot, L
  • Guiriec, S
  • Hanabata, Y
  • Harding, A
  • Hayashida, M
  • Hays, E
  • Hill, A
  • Hughes, R
  • Johannesson, G
  • Johnson, A
  • Johnson, R
  • Johnson, T
  • Johnson, W
  • Kamae, T
  • Katagiri, H
  • Kataoka, J
  • Kawai, N
  • Kerr, M
  • Knodlseder, J
  • Kocian, M
  • Kuehn, F
  • Kuss, M
  • Lande, J
  • Larsson, S
  • Latronico, L
  • Longo, F
  • Loparco, F
  • Lott, B
  • Lovellette, M
  • Lubrano, P
  • Madejski, G
  • Makeev, A
  • Marelli, M
  • Mazziotta, M
  • Mcenery, J
  • Meurer, C
  • Michelson, P
  • Mitthumsiri, W
  • Mizuno, T
  • Monte, C
  • Monzani, M
  • Morselli, A
  • Moskalenko, I
  • Murgia, S
  • Nolan, P
  • Nuss, E
  • Ohsugi, T
  • Okumura, A
  • Omodei, N
  • Orlando, E
  • Ormes, J
  • Paneque, D
  • Panetta, J
  • Parent, D
  • Pelassa, V
  • Pepe, M
  • Pesce-Rollins, M
  • Piron, F
  • Porter, T
  • Raino, S
  • Rando, R
  • Ray, P
  • Razzano, M
  • Rea, N
  • Reimer, A
  • Reimer, O
  • Reposeur, T
  • Ritz, S
  • Rochester, L
  • Rodriguez, A
  • Romani, R
  • Ryde, F
  • Sadrozinski, H
  • Sanchez, D
  • Sander, A
  • Scargle, J
  • Sgro, C
  • Shaw, M
  • Sierpowska-Bartosik, A
  • Siskind, E
  • Smith, D
  • Smith, P
  • Spandre, G
  • Spinelli, P
  • Striani, E
  • Strickman, M
  • Suson, D
  • Tajima, H
  • Takahashi, H
  • Takahashi, T
  • Tanaka, T
  • Thayer, J
  • Thayer, J
  • Thompson, D
  • Tibaldo, L
  • Torres, D
  • Tosti, G
  • Tramacere, A
  • Uchiyama, Y
  • Usher, T
  • Vasileiou, V
  • Vilchez, N
  • Vitale, V
  • Waite, A
  • Wang, P
  • Winer, B
  • Wood, K
  • Ylinen, T
  • Ziegler, M
  • Abdo, A
subjects:
  • C. Astrophysics (52)
ispartof: Astrophysical Journal Letters, Aug 2009, Vol.701(2), pp.L123-L128
description: This Letter presents the first results from the observations of LS I +61 deg 303 using Large Area Telescope data from the Fermi Gamma-Ray Space Telescope between 2008 August and 2009 March. Our results indicate variability that is consistent with the binary period, with the emission being modulated at 26.6 +/- 0.5 days. This constitutes the first detection of orbital periodicity in high-energy gamma rays (20 MeV-100 GeV, HE). The light curve is characterized by a broad peak after periastron, as well as a smaller peak just before apastron. The spectrum is best represented by a power law with an exponential cutoff, yielding an overall flux above 100 MeV of 0.82 +/- 0.03(stat) +/- 0.07(syst) 10-6 ph cm-2 s-1, with a cutoff at 6.3 +/- 1.1(stat) +/- 0.4(syst) GeV and photon index Delta *G = 2.21 +/- 0.04(stat) +/- 0.06(syst). There is no significant spectral change with orbital phase. The phase of maximum emission, close to periastron, hints at inverse Compton scattering as the main radiation mechanism. However, previous very high-energy gamma ray (>100 GeV, VHE) observations by MAGIC and VERITAS show peak emission close to apastron. This and the energy cutoff seen with Fermi suggest that the link between HE and VHE gamma rays is nontrivial.
language: eng
source:
identifier: ISSN: 2041-8205 ; DOI: 10.1088/0004-637X/701/2/L123
fulltext: fulltext
issn:
  • 20418205
  • 2041-8205
url: Link


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titleFERMI LAT OBSERVATIONS OF LS I +61 deg 303: FIRST DETECTION OF AN ORBITAL MODULATION IN GeV GAMMA RAYS
creatorAbdo, A ; Ackermann, M ; Ajello, M ; Atwood, W ; Axelsson, M ; Baldini, L ; Ballet, J ; Barbiellini, G ; Bastieri, D ; Baughman, B ; Bechtol, K ; Bellazzini, R ; Berenji, B ; Blandford, R ; Bloom, E ; Bonamente, E ; Borgland, A ; Bregeon, J ; Brez, A ; Brigida, M ; Bruel, P ; Burnett, T ; Caliandro, G ; Cameron, R ; Caraveo, P ; Casandjian, J ; Cavazzuti, E ; Cecchi, C ; Celik, O ; Charles, E ; Chaty, S ; Chekhtman, A ; Cheung, C ; Chiang, J ; Ciprini, S ; Claus, R ; Cohen-Tanugi, J ; Cominsky, L ; Conrad, J ; Corbel, S ; Corbet, R ; Cutini, S ; Dermer, C ; de Angelis, A ; de Luca, A ; de Palma, F ; Digel, S ; Dormody, M ; Drell, P ; Dubois, R ; Dubus, G ; Dumora, D ; Farnier, C ; Favuzzi, C ; Fegan, S ; Focke, W ; Frailis, M ; Fukazawa, Y ; Funk, S ; Fusco, P ; Gargano, F ; Gasparrini, D ; Gehrels, N ; Germani, S ; Giebels, B ; Giglietto, N ; Giordano, F ; Glanzman, T ; Godfrey, G ; Grenier, I ; Grondin, M-H ; Grove, J ; Guillemot, L ; Guiriec, S ; Hanabata, Y ; Harding, A ; Hayashida, M ; Hays, E ; Hill, A ; Hughes, R ; Johannesson, G ; Johnson, A ; Johnson, R ; Johnson, T ; Johnson, W ; Kamae, T ; Katagiri, H ; Kataoka, J ; Kawai, N ; Kerr, M ; Knodlseder, J ; Kocian, M ; Kuehn, F ; Kuss, M ; Lande, J ; Larsson, S ; Latronico, L ; Longo, F ; Loparco, F ; Lott, B ; Lovellette, M ; Lubrano, P ; Madejski, G ; Makeev, A ; Marelli, M ; Mazziotta, M ; Mcenery, J ; Meurer, C ; Michelson, P ; Mitthumsiri, W ; Mizuno, T ; Monte, C ; Monzani, M ; Morselli, A ; Moskalenko, I ; Murgia, S ; Nolan, P ; Nuss, E ; Ohsugi, T ; Okumura, A ; Omodei, N ; Orlando, E ; Ormes, J ; Paneque, D ; Panetta, J ; Parent, D ; Pelassa, V ; Pepe, M ; Pesce-Rollins, M ; Piron, F ; Porter, T ; Raino, S ; Rando, R ; Ray, P ; Razzano, M ; Rea, N ; Reimer, A ; Reimer, O ; Reposeur, T ; Ritz, S ; Rochester, L ; Rodriguez, A ; Romani, R ; Ryde, F ; Sadrozinski, H ; Sanchez, D ; Sander, A ; Scargle, J ; Sgro, C ; Shaw, M ; Sierpowska-Bartosik, A ; Siskind, E ; Smith, D ; Smith, P ; Spandre, G ; Spinelli, P ; Striani, E ; Strickman, M ; Suson, D ; Tajima, H ; Takahashi, H ; Takahashi, T ; Tanaka, T ; Thayer, J ; Thayer, J ; Thompson, D ; Tibaldo, L ; Torres, D ; Tosti, G ; Tramacere, A ; Uchiyama, Y ; Usher, T ; Vasileiou, V ; Vilchez, N ; Vitale, V ; Waite, A ; Wang, P ; Winer, B ; Wood, K ; Ylinen, T ; Ziegler, M ; Abdo, A
contributorAbdo, A (correspondence author)
ispartofAstrophysical Journal Letters, Aug 2009, Vol.701(2), pp.L123-L128
identifierISSN: 2041-8205 ; DOI: 10.1088/0004-637X/701/2/L123
subjectC. Astrophysics (52)
descriptionThis Letter presents the first results from the observations of LS I +61 deg 303 using Large Area Telescope data from the Fermi Gamma-Ray Space Telescope between 2008 August and 2009 March. Our results indicate variability that is consistent with the binary period, with the emission being modulated at 26.6 +/- 0.5 days. This constitutes the first detection of orbital periodicity in high-energy gamma rays (20 MeV-100 GeV, HE). The light curve is characterized by a broad peak after periastron, as well as a smaller peak just before apastron. The spectrum is best represented by a power law with an exponential cutoff, yielding an overall flux above 100 MeV of 0.82 +/- 0.03(stat) +/- 0.07(syst) 10-6 ph cm-2 s-1, with a cutoff at 6.3 +/- 1.1(stat) +/- 0.4(syst) GeV and photon index Delta *G = 2.21 +/- 0.04(stat) +/- 0.06(syst). There is no significant spectral change with orbital phase. The phase of maximum emission, close to periastron, hints at inverse Compton scattering as the main radiation mechanism. However, previous very high-energy gamma ray (>100 GeV, VHE) observations by MAGIC and VERITAS show peak emission close to apastron. This and the energy cutoff seen with Fermi suggest that the link between HE and VHE gamma rays is nontrivial.
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8Bastieri, D
9Baughman, B
10Bechtol, K
11Bellazzini, R
12Berenji, B
13Blandford, R
14Bloom, E
15Bonamente, E
16Borgland, A
17Bregeon, J
18Brez, A
19Brigida, M
20Bruel, P
21Burnett, T
22Caliandro, G
23Cameron, R
24Caraveo, P
25Casandjian, J
26Cavazzuti, E
27Cecchi, C
28Celik, O
29Charles, E
30Chaty, S
31Chekhtman, A
32Cheung, C
33Chiang, J
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35Claus, R
36Cohen-Tanugi, J
37Cominsky, L
38Conrad, J
39Corbel, S
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41Cutini, S
42Dermer, C
43de Angelis, A
44de Luca, A
45de Palma, F
46Digel, S
47Dormody, M
48Drell, P
49Dubois, R
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52Farnier, C
53Favuzzi, C
54Fegan, S
55Focke, W
56Frailis, M
57Fukazawa, Y
58Funk, S
59Fusco, P
60Gargano, F
61Gasparrini, D
62Gehrels, N
63Germani, S
64Giebels, B
65Giglietto, N
66Giordano, F
67Glanzman, T
68Godfrey, G
69Grenier, I
70Grondin, M-H
71Grove, J
72Guillemot, L
73Guiriec, S
74Hanabata, Y
75Harding, A
76Hayashida, M
77Hays, E
78Hill, A
79Hughes, R
80Johannesson, G
81Johnson, A
82Johnson, R
83Johnson, T
84Johnson, W
85Kamae, T
86Katagiri, H
87Kataoka, J
88Kawai, N
89Kerr, M
90Knodlseder, J
91Kocian, M
92Kuehn, F
93Kuss, M
94Lande, J
95Larsson, S
96Latronico, L
97Longo, F
98Loparco, F
99Lott, B
100...
titleFERMI LAT OBSERVATIONS OF LS I +61 deg 303: FIRST DETECTION OF AN ORBITAL MODULATION IN GeV GAMMA RAYS
descriptionThis Letter presents the first results from the observations of LS I +61 deg 303 using Large Area Telescope data from the Fermi Gamma-Ray Space Telescope between 2008 August and 2009 March. Our results indicate variability that is consistent with the binary period, with the emission being modulated at 26.6 +/- 0.5 days. This constitutes the first detection of orbital periodicity in high-energy gamma rays (20 MeV-100 GeV, HE). The light curve is characterized by a broad peak after periastron, as well as a smaller peak just before apastron. The spectrum is best represented by a power law with an exponential cutoff, yielding an overall flux above 100 MeV of 0.82 +/- 0.03(stat) +/- 0.07(syst) 10-6 ph cm-2 s-1, with a cutoff at 6.3 +/- 1.1(stat) +/- 0.4(syst) GeV and photon index Delta *G = 2.21 +/- 0.04(stat) +/- 0.06(syst). There is no significant spectral change with orbital phase. The phase of maximum emission, close to periastron, hints at inverse Compton scattering as the main radiation mechanism. However, previous very high-energy gamma ray (>100 GeV, VHE) observations by MAGIC and VERITAS show peak emission close to apastron. This and the energy cutoff seen with Fermi suggest that the link between HE and VHE gamma rays is nontrivial.
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titleFERMI LAT OBSERVATIONS OF LS I +61 deg 303: FIRST DETECTION OF AN ORBITAL MODULATION IN GeV GAMMA RAYS
authorAbdo, A ; Ackermann, M ; Ajello, M ; Atwood, W ; Axelsson, M ; Baldini, L ; Ballet, J ; Barbiellini, G ; Bastieri, D ; Baughman, B ; Bechtol, K ; Bellazzini, R ; Berenji, B ; Blandford, R ; Bloom, E ; Bonamente, E ; Borgland, A ; Bregeon, J ; Brez, A ; Brigida, M ; Bruel, P ; Burnett, T ; Caliandro, G ; Cameron, R ; Caraveo, P ; Casandjian, J ; Cavazzuti, E ; Cecchi, C ; Celik, O ; Charles, E ; Chaty, S ; Chekhtman, A ; Cheung, C ; Chiang, J ; Ciprini, S ; Claus, R ; Cohen-Tanugi, J ; Cominsky, L ; Conrad, J ; Corbel, S ; Corbet, R ; Cutini, S ; Dermer, C ; de Angelis, A ; de Luca, A ; de Palma, F ; Digel, S ; Dormody, M ; Drell, P ; Dubois, R ; Dubus, G ; Dumora, D ; Farnier, C ; Favuzzi, C ; Fegan, S ; Focke, W ; Frailis, M ; Fukazawa, Y ; Funk, S ; Fusco, P ; Gargano, F ; Gasparrini, D ; Gehrels, N ; Germani, S ; Giebels, B ; Giglietto, N ; Giordano, F ; Glanzman, T ; Godfrey, G ; Grenier, I ; Grondin, M-H ; Grove, J ; Guillemot, L ; Guiriec, S ; Hanabata, Y ; Harding, A ; Hayashida, M ; Hays, E ; Hill, A ; Hughes, R ; Johannesson, G ; Johnson, A ; Johnson, R ; Johnson, T ; Johnson, W ; Kamae, T ; Katagiri, H ; Kataoka, J ; Kawai, N ; Kerr, M ; Knodlseder, J ; Kocian, M ; Kuehn, F ; Kuss, M ; Lande, J ; Larsson, S ; Latronico, L ; Longo, F ; Loparco, F ; Lott, B ; Lovellette, M ; Lubrano, P ; Madejski, G ; Makeev, A ; Marelli, M ; Mazziotta, M ; Mcenery, J ; Meurer, C ; Michelson, P ; Mitthumsiri, W ; Mizuno, T ; Monte, C ; Monzani, M ; Morselli, A ; Moskalenko, I ; Murgia, S ; Nolan, P ; Nuss, E ; Ohsugi, T ; Okumura, A ; Omodei, N ; Orlando, E ; Ormes, J ; Paneque, D ; Panetta, J ; Parent, D ; Pelassa, V ; Pepe, M ; Pesce-Rollins, M ; Piron, F ; Porter, T ; Raino, S ; Rando, R ; Ray, P ; Razzano, M ; Rea, N ; Reimer, A ; Reimer, O ; Reposeur, T ; Ritz, S ; Rochester, L ; Rodriguez, A ; Romani, R ; Ryde, F ; Sadrozinski, H ; Sanchez, D ; Sander, A ; Scargle, J ; Sgro, C ; Shaw, M ; Sierpowska-Bartosik, A ; Siskind, E ; Smith, D ; Smith, P ; Spandre, G ; Spinelli, P ; Striani, E ; Strickman, M ; Suson, D ; Tajima, H ; Takahashi, H ; Takahashi, T ; Tanaka, T ; Thayer, J ; Thayer, J ; Thompson, D ; Tibaldo, L ; Torres, D ; Tosti, G ; Tramacere, A ; Uchiyama, Y ; Usher, T ; Vasileiou, V ; Vilchez, N ; Vitale, V ; Waite, A ; Wang, P ; Winer, B ; Wood, K ; Ylinen, T ; Ziegler, M ; Abdo, A
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0Abdo, A
1Ackermann, M
2Ajello, M
3Atwood, W
4Axelsson, M
5Baldini, L
6Ballet, J
7Barbiellini, G
8Bastieri, D
9Baughman, B
10Bechtol, K
11Bellazzini, R
12Berenji, B
13Blandford, R
14Bloom, E
15Bonamente, E
16Borgland, A
17Bregeon, J
18Brez, A
19Brigida, M
20Bruel, P
21Burnett, T
22Caliandro, G
23Cameron, R
24Caraveo, P
25Casandjian, J
26Cavazzuti, E
27Cecchi, C
28Celik, O
29Charles, E
30Chaty, S
31Chekhtman, A
32Cheung, C
33Chiang, J
34Ciprini, S
35Claus, R
36Cohen-Tanugi, J
37Cominsky, L
38Conrad, J
39Corbel, S
40Corbet, R
41Cutini, S
42Dermer, C
43de Angelis, A
44de Luca, A
45de Palma, F
46Digel, S
47Dormody, M
48Drell, P
49Dubois, R
50Dubus, G
51Dumora, D
52Farnier, C
53Favuzzi, C
54Fegan, S
55Focke, W
56Frailis, M
57Fukazawa, Y
58Funk, S
59Fusco, P
60Gargano, F
61Gasparrini, D
62Gehrels, N
63Germani, S
64Giebels, B
65Giglietto, N
66Giordano, F
67Glanzman, T
68Godfrey, G
69Grenier, I
70Grondin, M-H
71Grove, J
72Guillemot, L
73Guiriec, S
74Hanabata, Y
75Harding, A
76Hayashida, M
77Hays, E
78Hill, A
79Hughes, R
80Johannesson, G
81Johnson, A
82Johnson, R
83Johnson, T
84Johnson, W
85Kamae, T
86Katagiri, H
87Kataoka, J
88Kawai, N
89Kerr, M
90Knodlseder, J
91Kocian, M
92Kuehn, F
93Kuss, M
94Lande, J
95Larsson, S
96Latronico, L
97Longo, F
98Loparco, F
99Lott, B
100...
jtitleAstrophysical Journal Letters
toplevelpeer_reviewed
delivery
delcategoryRemote Search Resource
fulltextfulltext
addata
aulast
0Abdo
1Ackermann
2Ajello
3Atwood
4Axelsson
5Baldini
6Ballet
7Barbiellini
8Bastieri
9Baughman
10Bechtol
11Bellazzini
12Berenji
13Blandford
14Bloom
15Bonamente
16Borgland
17Bregeon
18Brez
19Brigida
20Bruel
21Burnett
22Caliandro
23Cameron
24Caraveo
25Casandjian
26Cavazzuti
27Cecchi
28Celik
29Charles
30Chaty
31Chekhtman
32Cheung
33Chiang
34Ciprini
35Claus
36Cohen-Tanugi
37Cominsky
38Conrad
39Corbel
40Corbet
41Cutini
42Dermer
43de Angelis
44de Luca
45de Palma
46Digel
47Dormody
48Drell
49Dubois
50Dubus
51Dumora
52Farnier
53Favuzzi
54Fegan
55Focke
56Frailis
57Fukazawa
58Funk
59Fusco
60Gargano
61Gasparrini
62Gehrels
63Germani
64Giebels
65Giglietto
66Giordano
67Glanzman
68Godfrey
69Grenier
70Grondin
71Grove
72Guillemot
73Guiriec
74Hanabata
75Harding
76Hayashida
77Hays
78Hill
79Hughes
80Johannesson
81Johnson
82Kamae
83Katagiri
84Kataoka
85Kawai
86Kerr
87Knodlseder
88Kocian
89Kuehn
90Kuss
91Lande
92Larsson
93Latronico
94Longo
95Loparco
96Lott
97Lovellette
98Lubrano
99Madejski
100...
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0A
1M
2W
3L
4J
5G
6D
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11P
12T
13C
14O
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17Y
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21H
22V
au
0Abdo, A
1Ackermann, M
2Ajello, M
3Atwood, W
4Axelsson, M
5Baldini, L
6Ballet, J
7Barbiellini, G
8Bastieri, D
9Baughman, B
10Bechtol, K
11Bellazzini, R
12Berenji, B
13Blandford, R
14Bloom, E
15Bonamente, E
16Borgland, A
17Bregeon, J
18Brez, A
19Brigida, M
20Bruel, P
21Burnett, T
22Caliandro, G
23Cameron, R
24Caraveo, P
25Casandjian, J
26Cavazzuti, E
27Cecchi, C
28Celik, O
29Charles, E
30Chaty, S
31Chekhtman, A
32Cheung, C
33Chiang, J
34Ciprini, S
35Claus, R
36Cohen-Tanugi, J
37Cominsky, L
38Conrad, J
39Corbel, S
40Corbet, R
41Cutini, S
42Dermer, C
43de Angelis, A
44de Luca, A
45de Palma, F
46Digel, S
47Dormody, M
48Drell, P
49Dubois, R
50Dubus, G
51Dumora, D
52Farnier, C
53Favuzzi, C
54Fegan, S
55Focke, W
56Frailis, M
57Fukazawa, Y
58Funk, S
59Fusco, P
60Gargano, F
61Gasparrini, D
62Gehrels, N
63Germani, S
64Giebels, B
65Giglietto, N
66Giordano, F
67Glanzman, T
68Godfrey, G
69Grenier, I
70Grondin, M-H
71Grove, J
72Guillemot, L
73Guiriec, S
74Hanabata, Y
75Harding, A
76Hayashida, M
77Hays, E
78Hill, A
79Hughes, R
80Johannesson, G
81Johnson, A
82Johnson, R
83Johnson, T
84Johnson, W
85Kamae, T
86Katagiri, H
87Kataoka, J
88Kawai, N
89Kerr, M
90Knodlseder, J
91Kocian, M
92Kuehn, F
93Kuss, M
94Lande, J
95Larsson, S
96Latronico, L
97Longo, F
98Loparco, F
99Lott, B
100...
addauAbdo, A
atitleFERMI LAT OBSERVATIONS OF LS I +61 deg 303: FIRST DETECTION OF AN ORBITAL MODULATION IN GeV GAMMA RAYS
jtitleAstrophysical Journal Letters
risdate20090801
volume701
issue2
spageL123
epageL128
pagesL123-L128
issn2041-8205
formatjournal
genrearticle
ristypeJOUR
abstractThis Letter presents the first results from the observations of LS I +61 deg 303 using Large Area Telescope data from the Fermi Gamma-Ray Space Telescope between 2008 August and 2009 March. Our results indicate variability that is consistent with the binary period, with the emission being modulated at 26.6 +/- 0.5 days. This constitutes the first detection of orbital periodicity in high-energy gamma rays (20 MeV-100 GeV, HE). The light curve is characterized by a broad peak after periastron, as well as a smaller peak just before apastron. The spectrum is best represented by a power law with an exponential cutoff, yielding an overall flux above 100 MeV of 0.82 +/- 0.03(stat) +/- 0.07(syst) 10-6 ph cm-2 s-1, with a cutoff at 6.3 +/- 1.1(stat) +/- 0.4(syst) GeV and photon index Delta *G = 2.21 +/- 0.04(stat) +/- 0.06(syst). There is no significant spectral change with orbital phase. The phase of maximum emission, close to periastron, hints at inverse Compton scattering as the main radiation mechanism. However, previous very high-energy gamma ray (>100 GeV, VHE) observations by MAGIC and VERITAS show peak emission close to apastron. This and the energy cutoff seen with Fermi suggest that the link between HE and VHE gamma rays is nontrivial.
doi10.1088/0004-637X/701/2/L123
urlhttp://search.proquest.com/docview/21304681/
eissn20418213
date2009-08-01