Fermi Large Area Telescope observations of the supernova remnant G8.7-0.1

M. Ajello; A. Allafort; L. Baldini; J. Ballet; G. Barbiellini; D. Bastieri; K. Bechtol; R. Bellazzini; B. Berenji; R. D. Blandford; E. D. Bloom; E. Bonamente; A. W. Borgland; J. Bregeon; M. Brigida; P. Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; J. M. Casandjian; C. Cecchi; E. Charles; A. Chekhtman; S. Ciprini; R. Claus; J. Cohen-Tanugi; S. Cutini; A. De Angelis; F. De Palma; C. D. Dermer; E. Do Couto E Silva; P. S. Drell; A. Drlica-Wagner; R. Dubois; C. Favuzzi; S. J. Fegan; E. C. Ferrara; W. B. Focke; M. Frailis; Y. Fukazawa; Y. Fukui; P. Fusco; F. Gargano; D. Gasparrini; S. Germani; N. Giglietto; P. Giommi; F. Giordano; M. Giroletti; T. Glanzman; G. Godfrey; J. E. Grove; S. Guiriec; D. Hadasch; Y. Hanabata; A. K. Harding; K. Hayashi; E. Hays; R. Itoh; G. Jóhannesson; A. S. Johnson; T. Kamae; H. Katagiri; J. Kataoka; J. Knödlseder; H. Kubo; M. Kuss; J. Lande; L. Latronico; S. H. Lee; A. M. Lionetto; F. Longo; F. Loparco; M. N. Lovellette; P. Lubrano; M. N. Mazziotta; J. Mehault; P. F. Michelson; T. Mizuno; A. A. Moiseev; C. Monte; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; T. Nakamori; M. Naumann-Godo; S. Nishino; P. L. Nolan; J. P. Norris; E. Nuss; M. Ohno; T. Ohsugi; A. Okumura; N. Omodei; E. Orlando; J. F. Ormes; D. Paneque; D. Parent; V. Pelassa; M. Pesce-Rollins; M. Pierbattista; F. Piron; T. A. Porter; S. Rainò; R. Rando; A. Reimer; O. Reimer; T. Reposeur; M. Roth; H. F.W. Sadrozinski; C. Sgrò; E. J. Siskind; P. D. Smith; G. Spandre; P. Spinelli; D. J. Suson; H. Tajima; H. Takahashi; T. Tanaka; J. G. Thayer; J. B. Thayer; L. Tibaldo; O. Tibolla; D. F. Torres; G. Tosti; A. Tramacere; E. Troja; Y. Uchiyama; T. Uehara; T. L. Usher; J. Vandenbroucke; A. Van Etten; V. Vasileiou; G. Vianello; N. Vilchez; V. Vitale; A. P. Waite; P. Wang; B. L. Winer; K. S. Wood; H. Yamamoto; R. Yamazaki; Z. Yang; H. Yasuda; M. Ziegler; S. Zimmer

doi:10.1088/0004-637X/744/1/80

Fermi Large Area Telescope observations of the supernova remnant G8.7-0.1

M. Ajello^*, A. Allafort, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, R. D. Blandford, E. D. Bloom, E. Bonamente, A. W. Borgland, J. Bregeon, M. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. CameronP. A. Caraveo, J. M. Casandjian, C. Cecchi, E. Charles, A. Chekhtman, S. Ciprini, R. Claus, J. Cohen-Tanugi, S. Cutini, A. De Angelis, F. De Palma, C. D. Dermer, E. Do Couto E Silva, P. S. Drell, A. Drlica-Wagner, R. Dubois, C. Favuzzi, S. J. Fegan, E. C. Ferrara, W. B. Focke, M. Frailis, Y. Fukazawa, Y. Fukui, P. Fusco, F. Gargano, D. Gasparrini, S. Germani, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, J. E. Grove, S. Guiriec, D. Hadasch, Y. Hanabata, A. K. Harding, K. Hayashi, E. Hays, R. Itoh, G. Jóhannesson, A. S. Johnson, T. Kamae, H. Katagiri, J. Kataoka, J. Knödlseder, H. Kubo, M. Kuss, J. Lande, L. Latronico, S. H. Lee, A. M. Lionetto, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, M. N. Mazziotta, J. Mehault, P. F. Michelson, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, T. Nakamori, M. Naumann-Godo, S. Nishino, P. L. Nolan, J. P. Norris, E. Nuss, M. Ohno, T. Ohsugi, A. Okumura, N. Omodei, E. Orlando, J. F. Ormes, D. Paneque, D. Parent, V. Pelassa, M. Pesce-Rollins, M. Pierbattista, F. Piron, T. A. Porter, S. Rainò, R. Rando, A. Reimer, O. Reimer, T. Reposeur, M. Roth, H. F.W. Sadrozinski, C. Sgrò, E. J. Siskind, P. D. Smith, G. Spandre, P. Spinelli, D. J. Suson, H. Tajima, H. Takahashi, T. Tanaka, J. G. Thayer, J. B. Thayer, L. Tibaldo, O. Tibolla, D. F. Torres, G. Tosti, A. Tramacere, E. Troja, Y. Uchiyama, T. Uehara, T. L. Usher, J. Vandenbroucke, A. Van Etten, V. Vasileiou, G. Vianello, N. Vilchez, V. Vitale, A. P. Waite, P. Wang, B. L. Winer, K. S. Wood, H. Yamamoto, R. Yamazaki, Z. Yang, H. Yasuda, M. Ziegler, S. Zimmer

^*Corresponding author for this work

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

45 Citations (Scopus)

Abstract

We present a detailed analysis of the GeV gamma-ray emission toward the supernova remnant (SNR) G8.7-0.1 with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. An investigation of the relationship between G8.7-0.1 and the TeV unidentified source HESS J1804-216 provides us with an important clue on diffusion process of cosmic rays if particle acceleration operates in the SNR. TheGeV gamma-ray emission is extended with most of the emission in positional coincidence with the SNR G8.7-0.1 and a lesser part located outside the western boundary of G8.7-0.1. The region of the gamma-ray emission overlaps spatially connected molecular clouds, implying a physical connection for the gamma-ray structure. The total gamma-ray spectrum measured with LAT from 200MeV-100GeV can be described by a broken power-law function with a break of 2.4 ± 0.6 (stat) ± 1.2 (sys)GeV, and photon indices of 2.10 ± 0.06 (stat) ± 0.10 (sys) below the break and 2.70 ± 0.12 (stat) ± 0.14 (sys) above the break. Given the spatial association among the gamma rays, the radio emission of G8.7-0.1, and the molecular clouds, the decay of π⁰s produced by particles accelerated in the SNR and hitting the molecular clouds naturally explains theGeV gamma-ray spectrum. We also find that theGeV morphology is not well represented by the TeV emission from HESS J1804-216 and that the spectrum in theGeV band is not consistent with the extrapolation of the TeV gamma-ray spectrum. The spectral index of the TeV emission is consistent with the particle spectral index predicted by a theory that assumes energy-dependent diffusion of particles accelerated in an SNR. We discuss the possibility that the TeV spectrum originates from the interaction of particles accelerated in G8.7-0.1 with molecular clouds, and we constrain the diffusion coefficient of the particles.

Original language	English
Article number	80
Journal	Astrophysical Journal
Volume	744
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/744/1/80
Publication status	Published - 2012 Jan 1

Keywords

ISM: individual objects (G8.7?0.1, HESS J1804?216)
ISM: supernova remnants
acceleration of particles
cosmic rays
gamma rays: ISM

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/0004-637X/744/1/80

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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., Bregeon, J., Brigida, M., Bruel, P., Buehler, R., Buson, S., Caliandro, G. A., ... Zimmer, S. (2012). Fermi Large Area Telescope observations of the supernova remnant G8.7-0.1. Astrophysical Journal, 744(1), [80]. https://doi.org/10.1088/0004-637X/744/1/80

Ajello, M, Allafort, A, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Berenji, B, Blandford, RD, Bloom, ED, Bonamente, E, Borgland, AW, Bregeon, J, Brigida, M, Bruel, P, Buehler, R, Buson, S, Caliandro, GA, Cameron, RA, Caraveo, PA, Casandjian, JM, Cecchi, C, Charles, E, Chekhtman, A, Ciprini, S, Claus, R, Cohen-Tanugi, J, Cutini, S, De Angelis, A, De Palma, F, Dermer, CD, Do Couto E Silva, E, Drell, PS, Drlica-Wagner, A, Dubois, R, Favuzzi, C, Fegan, SJ, Ferrara, EC, Focke, WB, Frailis, M, Fukazawa, Y, Fukui, Y, Fusco, P, Gargano, F, Gasparrini, D, Germani, S, Giglietto, N, Giommi, P, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grove, JE, Guiriec, S, Hadasch, D, Hanabata, Y, Harding, AK, Hayashi, K, Hays, E, Itoh, R, Jóhannesson, G, Johnson, AS, Kamae, T, Katagiri, H, Kataoka, J, Knödlseder, J, Kubo, H, Kuss, M, Lande, J, Latronico, L, Lee, SH, Lionetto, AM, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Mazziotta, MN, Mehault, J, Michelson, PF, Mizuno, T, Moiseev, AA, Monte, C, Monzani, ME, Morselli, A, Moskalenko, IV, Murgia, S, Nakamori, T, Naumann-Godo, M, Nishino, S, Nolan, PL, Norris, JP, Nuss, E, Ohno, M, Ohsugi, T, Okumura, A, Omodei, N, Orlando, E, Ormes, JF, Paneque, D, Parent, D, Pelassa, V, Pesce-Rollins, M, Pierbattista, M, Piron, F, Porter, TA, Rainò, S, Rando, R, Reimer, A, Reimer, O, Reposeur, T, Roth, M, Sadrozinski, HFW, Sgrò, C, Siskind, EJ, Smith, PD, Spandre, G, Spinelli, P, Suson, DJ, Tajima, H, Takahashi, H, Tanaka, T, Thayer, JG, Thayer, JB, Tibaldo, L, Tibolla, O, Torres, DF, Tosti, G, Tramacere, A, Troja, E, Uchiyama, Y, Uehara, T, Usher, TL, Vandenbroucke, J, Van Etten, A, Vasileiou, V, Vianello, G, Vilchez, N, Vitale, V, Waite, AP, Wang, P, Winer, BL, Wood, KS, Yamamoto, H, Yamazaki, R, Yang, Z, Yasuda, H, Ziegler, M & Zimmer, S 2012, 'Fermi Large Area Telescope observations of the supernova remnant G8.7-0.1', Astrophysical Journal, vol. 744, no. 1, 80. https://doi.org/10.1088/0004-637X/744/1/80

@article{bc2b4a5c3adf452a93f563d878bd2af5,

title = "Fermi Large Area Telescope observations of the supernova remnant G8.7-0.1",

abstract = "We present a detailed analysis of the GeV gamma-ray emission toward the supernova remnant (SNR) G8.7-0.1 with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. An investigation of the relationship between G8.7-0.1 and the TeV unidentified source HESS J1804-216 provides us with an important clue on diffusion process of cosmic rays if particle acceleration operates in the SNR. TheGeV gamma-ray emission is extended with most of the emission in positional coincidence with the SNR G8.7-0.1 and a lesser part located outside the western boundary of G8.7-0.1. The region of the gamma-ray emission overlaps spatially connected molecular clouds, implying a physical connection for the gamma-ray structure. The total gamma-ray spectrum measured with LAT from 200MeV-100GeV can be described by a broken power-law function with a break of 2.4 ± 0.6 (stat) ± 1.2 (sys)GeV, and photon indices of 2.10 ± 0.06 (stat) ± 0.10 (sys) below the break and 2.70 ± 0.12 (stat) ± 0.14 (sys) above the break. Given the spatial association among the gamma rays, the radio emission of G8.7-0.1, and the molecular clouds, the decay of π0s produced by particles accelerated in the SNR and hitting the molecular clouds naturally explains theGeV gamma-ray spectrum. We also find that theGeV morphology is not well represented by the TeV emission from HESS J1804-216 and that the spectrum in theGeV band is not consistent with the extrapolation of the TeV gamma-ray spectrum. The spectral index of the TeV emission is consistent with the particle spectral index predicted by a theory that assumes energy-dependent diffusion of particles accelerated in an SNR. We discuss the possibility that the TeV spectrum originates from the interaction of particles accelerated in G8.7-0.1 with molecular clouds, and we constrain the diffusion coefficient of the particles.",

keywords = "ISM: individual objects (G8.7?0.1, HESS J1804?216), ISM: supernova remnants, acceleration of particles, cosmic rays, gamma rays: ISM",

author = "M. Ajello and A. Allafort and L. Baldini and J. Ballet and G. Barbiellini and D. Bastieri and K. Bechtol and R. Bellazzini and B. Berenji and Blandford, {R. D.} and Bloom, {E. D.} and E. Bonamente and Borgland, {A. W.} and J. Bregeon and M. Brigida and P. Bruel and R. Buehler and S. Buson and Caliandro, {G. A.} and Cameron, {R. A.} and Caraveo, {P. A.} and Casandjian, {J. M.} and C. Cecchi and E. Charles and A. Chekhtman and S. Ciprini and R. Claus and J. Cohen-Tanugi and S. Cutini and {De Angelis}, A. and {De Palma}, F. and Dermer, {C. D.} and {Do Couto E Silva}, E. and Drell, {P. S.} and A. Drlica-Wagner and R. Dubois and C. Favuzzi and Fegan, {S. J.} and Ferrara, {E. C.} and Focke, {W. B.} and M. Frailis and Y. Fukazawa and Y. Fukui and P. Fusco and F. Gargano and D. Gasparrini and S. Germani and N. Giglietto and P. Giommi and F. Giordano and M. Giroletti and T. Glanzman and G. Godfrey and Grove, {J. E.} and S. Guiriec and D. Hadasch and Y. Hanabata and Harding, {A. K.} and K. Hayashi and E. Hays and R. Itoh and G. J{\'o}hannesson and Johnson, {A. S.} and T. Kamae and H. Katagiri and J. Kataoka and J. Kn{\"o}dlseder and H. Kubo and M. Kuss and J. Lande and L. Latronico and Lee, {S. H.} and Lionetto, {A. M.} and F. Longo and F. Loparco and Lovellette, {M. N.} and P. Lubrano and Mazziotta, {M. N.} and J. Mehault and Michelson, {P. F.} and T. Mizuno and Moiseev, {A. A.} and C. Monte and Monzani, {M. E.} and A. Morselli and Moskalenko, {I. V.} and S. Murgia and T. Nakamori and M. Naumann-Godo and S. Nishino and Nolan, {P. L.} and Norris, {J. P.} and E. Nuss and M. Ohno and T. Ohsugi and A. Okumura and N. Omodei and E. Orlando and Ormes, {J. F.} and D. Paneque and D. Parent and V. Pelassa and M. Pesce-Rollins and M. Pierbattista and F. Piron and Porter, {T. A.} and S. Rain{\`o} and R. Rando and A. Reimer and O. Reimer and T. Reposeur and M. Roth and Sadrozinski, {H. F.W.} and C. Sgr{\`o} and Siskind, {E. J.} and Smith, {P. D.} and G. Spandre and P. Spinelli and Suson, {D. J.} and H. Tajima and H. Takahashi and T. Tanaka and Thayer, {J. G.} and Thayer, {J. B.} and L. Tibaldo and O. Tibolla and Torres, {D. F.} and G. Tosti and A. Tramacere and E. Troja and Y. Uchiyama and T. Uehara and Usher, {T. L.} and J. Vandenbroucke and {Van Etten}, A. and V. Vasileiou and G. Vianello and N. Vilchez and V. Vitale and Waite, {A. P.} and P. Wang and Winer, {B. L.} and Wood, {K. S.} and H. Yamamoto and R. Yamazaki and Z. Yang and H. Yasuda and M. Ziegler and S. Zimmer",

year = "2012",

month = jan,

day = "1",

doi = "10.1088/0004-637X/744/1/80",

language = "English",

volume = "744",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1",

}

TY - JOUR

T1 - Fermi Large Area Telescope observations of the supernova remnant G8.7-0.1

AU - Ajello, M.

AU - Allafort, A.

AU - Baldini, L.

AU - Ballet, J.

AU - Barbiellini, G.

AU - Bastieri, D.

AU - Bechtol, K.

AU - Bellazzini, R.

AU - Berenji, B.

AU - Blandford, R. D.

AU - Bloom, E. D.

AU - Bonamente, E.

AU - Borgland, A. W.

AU - Bregeon, J.

AU - Brigida, M.

AU - Bruel, P.

AU - Buehler, R.

AU - Buson, S.

AU - Caliandro, G. A.

AU - Cameron, R. A.

AU - Caraveo, P. A.

AU - Casandjian, J. M.

AU - Cecchi, C.

AU - Charles, E.

AU - Chekhtman, A.

AU - Ciprini, S.

AU - Claus, R.

AU - Cohen-Tanugi, J.

AU - Cutini, S.

AU - De Angelis, A.

AU - De Palma, F.

AU - Dermer, C. D.

AU - Do Couto E Silva, E.

AU - Drell, P. S.

AU - Drlica-Wagner, A.

AU - Dubois, R.

AU - Favuzzi, C.

AU - Fegan, S. J.

AU - Ferrara, E. C.

AU - Focke, W. B.

AU - Frailis, M.

AU - Fukazawa, Y.

AU - Fukui, Y.

AU - Fusco, P.

AU - Gargano, F.

AU - Gasparrini, D.

AU - Germani, S.

AU - Giglietto, N.

AU - Giommi, P.

AU - Giordano, F.

AU - Giroletti, M.

AU - Glanzman, T.

AU - Godfrey, G.

AU - Grove, J. E.

AU - Guiriec, S.

AU - Hadasch, D.

AU - Hanabata, Y.

AU - Harding, A. K.

AU - Hayashi, K.

AU - Hays, E.

AU - Itoh, R.

AU - Jóhannesson, G.

AU - Johnson, A. S.

AU - Kamae, T.

AU - Katagiri, H.

AU - Kataoka, J.

AU - Knödlseder, J.

AU - Kubo, H.

AU - Kuss, M.

AU - Lande, J.

AU - Latronico, L.

AU - Lee, S. H.

AU - Lionetto, A. M.

AU - Longo, F.

AU - Loparco, F.

AU - Lovellette, M. N.

AU - Lubrano, P.

AU - Mazziotta, M. N.

AU - Mehault, J.

AU - Michelson, P. F.

AU - Mizuno, T.

AU - Moiseev, A. A.

AU - Monte, C.

AU - Monzani, M. E.

AU - Morselli, A.

AU - Moskalenko, I. V.

AU - Murgia, S.

AU - Nakamori, T.

AU - Naumann-Godo, M.

AU - Nishino, S.

AU - Nolan, P. L.

AU - Norris, J. P.

AU - Nuss, E.

AU - Ohno, M.

AU - Ohsugi, T.

AU - Okumura, A.

AU - Omodei, N.

AU - Orlando, E.

AU - Ormes, J. F.

AU - Paneque, D.

AU - Parent, D.

AU - Pelassa, V.

AU - Pesce-Rollins, M.

AU - Pierbattista, M.

AU - Piron, F.

AU - Porter, T. A.

AU - Rainò, S.

AU - Rando, R.

AU - Reimer, A.

AU - Reimer, O.

AU - Reposeur, T.

AU - Roth, M.

AU - Sadrozinski, H. F.W.

AU - Sgrò, C.

AU - Siskind, E. J.

AU - Smith, P. D.

AU - Spandre, G.

AU - Spinelli, P.

AU - Suson, D. J.

AU - Tajima, H.

AU - Takahashi, H.

AU - Tanaka, T.

AU - Thayer, J. G.

AU - Thayer, J. B.

AU - Tibaldo, L.

AU - Tibolla, O.

AU - Torres, D. F.

AU - Tosti, G.

AU - Tramacere, A.

AU - Troja, E.

AU - Uchiyama, Y.

AU - Uehara, T.

AU - Usher, T. L.

AU - Vandenbroucke, J.

AU - Van Etten, A.

AU - Vasileiou, V.

AU - Vianello, G.

AU - Vilchez, N.

AU - Vitale, V.

AU - Waite, A. P.

AU - Wang, P.

AU - Winer, B. L.

AU - Wood, K. S.

AU - Yamamoto, H.

AU - Yamazaki, R.

AU - Yang, Z.

AU - Yasuda, H.

AU - Ziegler, M.

AU - Zimmer, S.

PY - 2012/1/1

Y1 - 2012/1/1

N2 - We present a detailed analysis of the GeV gamma-ray emission toward the supernova remnant (SNR) G8.7-0.1 with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. An investigation of the relationship between G8.7-0.1 and the TeV unidentified source HESS J1804-216 provides us with an important clue on diffusion process of cosmic rays if particle acceleration operates in the SNR. TheGeV gamma-ray emission is extended with most of the emission in positional coincidence with the SNR G8.7-0.1 and a lesser part located outside the western boundary of G8.7-0.1. The region of the gamma-ray emission overlaps spatially connected molecular clouds, implying a physical connection for the gamma-ray structure. The total gamma-ray spectrum measured with LAT from 200MeV-100GeV can be described by a broken power-law function with a break of 2.4 ± 0.6 (stat) ± 1.2 (sys)GeV, and photon indices of 2.10 ± 0.06 (stat) ± 0.10 (sys) below the break and 2.70 ± 0.12 (stat) ± 0.14 (sys) above the break. Given the spatial association among the gamma rays, the radio emission of G8.7-0.1, and the molecular clouds, the decay of π0s produced by particles accelerated in the SNR and hitting the molecular clouds naturally explains theGeV gamma-ray spectrum. We also find that theGeV morphology is not well represented by the TeV emission from HESS J1804-216 and that the spectrum in theGeV band is not consistent with the extrapolation of the TeV gamma-ray spectrum. The spectral index of the TeV emission is consistent with the particle spectral index predicted by a theory that assumes energy-dependent diffusion of particles accelerated in an SNR. We discuss the possibility that the TeV spectrum originates from the interaction of particles accelerated in G8.7-0.1 with molecular clouds, and we constrain the diffusion coefficient of the particles.

AB - We present a detailed analysis of the GeV gamma-ray emission toward the supernova remnant (SNR) G8.7-0.1 with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. An investigation of the relationship between G8.7-0.1 and the TeV unidentified source HESS J1804-216 provides us with an important clue on diffusion process of cosmic rays if particle acceleration operates in the SNR. TheGeV gamma-ray emission is extended with most of the emission in positional coincidence with the SNR G8.7-0.1 and a lesser part located outside the western boundary of G8.7-0.1. The region of the gamma-ray emission overlaps spatially connected molecular clouds, implying a physical connection for the gamma-ray structure. The total gamma-ray spectrum measured with LAT from 200MeV-100GeV can be described by a broken power-law function with a break of 2.4 ± 0.6 (stat) ± 1.2 (sys)GeV, and photon indices of 2.10 ± 0.06 (stat) ± 0.10 (sys) below the break and 2.70 ± 0.12 (stat) ± 0.14 (sys) above the break. Given the spatial association among the gamma rays, the radio emission of G8.7-0.1, and the molecular clouds, the decay of π0s produced by particles accelerated in the SNR and hitting the molecular clouds naturally explains theGeV gamma-ray spectrum. We also find that theGeV morphology is not well represented by the TeV emission from HESS J1804-216 and that the spectrum in theGeV band is not consistent with the extrapolation of the TeV gamma-ray spectrum. The spectral index of the TeV emission is consistent with the particle spectral index predicted by a theory that assumes energy-dependent diffusion of particles accelerated in an SNR. We discuss the possibility that the TeV spectrum originates from the interaction of particles accelerated in G8.7-0.1 with molecular clouds, and we constrain the diffusion coefficient of the particles.

KW - ISM: individual objects (G8.7?0.1, HESS J1804?216)

KW - ISM: supernova remnants

KW - acceleration of particles

KW - cosmic rays

KW - gamma rays: ISM

UR - http://www.scopus.com/inward/record.url?scp=83755221085&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=83755221085&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/744/1/80

DO - 10.1088/0004-637X/744/1/80

M3 - Article

AN - SCOPUS:83755221085

SN - 0004-637X

VL - 744

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 80

ER -

Fermi Large Area Telescope observations of the supernova remnant G8.7-0.1

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