Gamma-ray emission from the shell of supernova remnant W44 revealed by the Fermi LAT

A. A. Abdo; M. Ackermann; M. Ajello; L. Baldini; J. Ballet; G. Barbiellini; M. G. Baring; D. Bastieri; B. M. Baughman; K. Bechtol; R. Bellazzini; B. Berenji; R. D. Blandford; E. D. Bloom; E. Bonamente; A. W. Borgland; J. Bregeon; A. Brez; M. Brigida; P. Bruel; T. H. Burnett; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; J. M. Casandjian; C. Cecchi; Ö Çelik; A. Chekhtman; C. C. Cheung; J. Chiang; S. Ciprini; R. Claus; I. Cognard; J. Cohen-Tanugi; L. R. Cominsky; J. Conrad; S. Cutini; C. D. Dermer; A. De Angelis; F. De Palma; S. W. Digel; E. Do Couto E Silva; P. S. Drell; R. Dubois; D. Dumora; C. Espinoza; C. Farmer; C. Favuzzi; S. J. Fegan; W. B. Focke; P. Fortin; M. Frailis; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; N. Gehrels; S. Germani; G. Giavitto; B. Giebels; N. Giglietto; F. Giordano; T. Glanzman; G. Godfrey; I. A. Grenier; M. H. Grondin; J. E. Grove; L. Guillemot; S. Guiriec; Y. Hanabata; A. K. Harding; M. Hayashida; E. Hays; R. E. Hughes; M. S. Jackson; G. Jóhannesson; A. S. Johnson; T. J. Johnson; W. N. Johnson; T. Kamae; H. Katagiri; J. Kataoka; J. Katsuta; N. Kawai; M. Kerr; J. Knödlseder; M. L. Kocian; M. Kramer; M. Kuss; J. Lande; L. Latronico; M. Lemoine-Goumard; F. Longo; F. Loparco; B. Lott; M. N. Lovellette; P. Lubrano; A. G. Lyne; G. M. Madejski; A. Makeev; M. N. Mazziotta; J. E. McEnery; C. Meurer; P. F. Michelson; W. Mitthumsiri; T. Mizuno; C. Monte; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; T. Nakamori; P. L. Nolan; J. P. Noms; A. Noutsos; E. Nuss; T. Ohsugi; N. Omodei; E. Orlando; J. F. Ormes; D. Paneque; D. Parent; V. Pelassa; M. Pepe; M. Pesce-Rollins; F. Piron; T. A. Porter; S. Rainò; R. Rando; M. Razzano; A. Reimer; O. Reimer; T. Reposeur; A. Y. Rodriguez; R. W. Romani; M. Roth; F. Ryde; H. F.W. Sadrozinski; D. Sanchez; A. Sander; P. M. Saz Parkinson; J. D. Scargle; C. Sgrò; E. J. Siskind; D. A. Smith; P. D. Smith; G. Spandre; P. Spinelli; B. W. Stappers; F. W. Stecker; M. S. Strikman; D. J. Suson; H. Tajima; H. Takahashi; T. Takahashi; T. Tanaka; J. B. Thayer; J. G. Thayer; G. Theureau; D. J. Thompson; L. Tibaldo; O. Tibolla; D. F. Torres; G. Tosti; A. Tramacere; Y. Uchiyama; T. L. Usher; V. Vasileiou; C. Venter; N. Vilchez; V. Vitale; A. P. Waite; P. Wang; B. L. Winer; K. S. Wood; R. Yamazaki; T. Ylinen; M. Ziegler

doi:10.1126/science.1182787

Gamma-ray emission from the shell of supernova remnant W44 revealed by the Fermi LAT

A. A. Abdo
, M. Ackermann
, M. Ajello
, L. Baldini
, J. Ballet
, G. Barbiellini
, M. G. Baring
, D. Bastieri
, B. M. Baughman
, K. Bechtol
, R. Bellazzini
, B. Berenji
, R. D. Blandford
, E. D. Bloom
, E. Bonamente
, A. W. Borgland
, J. Bregeon
, A. Brez
, M. Brigida
, P. Bruel

T. H. Burnett, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, J. M. Casandjian, C. Cecchi, Ö Çelik, A. Chekhtman, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, I. Cognard, J. Cohen-Tanugi, L. R. Cominsky, J. Conrad, S. Cutini, C. D. Dermer, A. De Angelis, F. De Palma, S. W. Digel, E. Do Couto E Silva, P. S. Drell, R. Dubois, D. Dumora, C. Espinoza, C. Farmer, C. Favuzzi, S. J. Fegan, W. B. Focke, P. Fortin, M. Frailis, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, G. Giavitto, B. Giebels, N. Giglietto, F. Giordano, T. Glanzman, G. Godfrey, I. A. Grenier, M. H. Grondin, J. E. Grove, L. Guillemot, S. Guiriec, Y. Hanabata, A. K. Harding, M. Hayashida, E. Hays, R. E. Hughes, M. S. Jackson, G. Jóhannesson, A. S. Johnson, T. J. Johnson, W. N. Johnson, T. Kamae, H. Katagiri, J. Kataoka, J. Katsuta, N. Kawai, M. Kerr, J. Knödlseder, M. L. Kocian, M. Kramer, M. Kuss, J. Lande, L. Latronico, M. Lemoine-Goumard, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, A. G. Lyne, G. M. Madejski, A. Makeev, M. N. Mazziotta, J. E. McEnery, C. Meurer, P. F. Michelson, W. Mitthumsiri, T. Mizuno, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, T. Nakamori, P. L. Nolan, J. P. Noms, A. Noutsos, E. Nuss, T. Ohsugi, N. Omodei, E. Orlando, J. F. Ormes, D. Paneque, D. Parent, V. Pelassa, M. Pepe, M. Pesce-Rollins, F. Piron, T. A. Porter, S. Rainò, R. Rando, M. Razzano, A. Reimer, O. Reimer, T. Reposeur, A. Y. Rodriguez, R. W. Romani, M. Roth, F. Ryde, H. F.W. Sadrozinski, D. Sanchez, A. Sander, P. M. Saz Parkinson, J. D. Scargle, C. Sgrò, E. J. Siskind, D. A. Smith, P. D. Smith, G. Spandre, P. Spinelli, B. W. Stappers, F. W. Stecker, M. S. Strikman, D. J. Suson, H. Tajima, H. Takahashi, T. Takahashi, T. Tanaka, J. B. Thayer, J. G. Thayer, G. Theureau, D. J. Thompson, L. Tibaldo, O. Tibolla, D. F. Torres, G. Tosti, A. Tramacere, Y. Uchiyama, T. L. Usher, V. Vasileiou, C. Venter, N. Vilchez, V. Vitale, A. P. Waite, P. Wang, B. L. Winer, K. S. Wood, R. Yamazaki, T. Ylinen, M. Ziegler

Naval Research Laboratory
SLAC National Accelerator Laboratory
Sezione di Pisa
Université Paris Diderot
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
Universitá
Rice University
Sezione di Padova
Università di Padova
The Ohio State University
Sezione di Perugia
Università di Perugia
Dell'Università e Del Politecnico di Bari
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
École polytechnique
University of Washington
INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica
NASA/Goddard Space Flight Center
University of Maryland, Baltimore County (UMBC)
George Mason University
Agenzia Spaziale Italiana
CNRS
INSU - Institut National des Sciences de l'Univers
Laboratoire Univers et Particules de Montpellier
Sonoma State University
Stockholm University
Oskar Klein Centre
Royal Swedish Academy ot Sciences Research
Università di Udine
Université Victor Segalen Bordeaux II
IN2P3/CNRS
University of Manchester
Hiroshima University
University of Maryland, College Park
Università di Trieste
University of Alabama in Huntsville
AlbaNova
Institute of Science Tokyo
Waseda University
Japan Aerospace Exploration Agency
University of Tokyo
Institute of Physical and Chemical Research (RIKEN)
IRAP
Max-Planck-Institut für Radioastronomie
University of Denver
Max-Planck Institut für extraterrestrische Physik
Santa Cruz Institute for Particle Physics
Leopold-Franzens-Universität Innsbruck
Institut d'Estudis Espacials de Catalunya (IEEC)
NASA Ames Research Center
NYCB Real-Time Computing Inc.
Purdue University Calumet
MaXPlanck-lnstitut für Kernphysik
Institució Catalana de Recerca i Estudis Avançats
Consorcio Interuniversitario per la Fisica Spaziale (CIFS)
North West University
Sezione di Roma Tor Vergata
Uníversítà di Roma Lor Vergata
University of Kalmar

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

254 Citations (Scopus)

Abstract

Recent observations of supernova remnants (SNRs) hint that they accelerate cosmic rays to energies close to ∼10¹⁵ electron volts. However, the nature of the particles that produce the emission remains ambiguous. We report observations of SNR W44 with the Fermi Large Area Telescope at energies between 2 × 10⁸ electron volts and 3 × 10¹¹ electron volts. The detection of a source with a morphology corresponding to the SNR shell implies that the emission is produced by particles accelerated there. The gamma-ray spectrum is well modeled with emission from protons and nuclei. Its steepening above -10⁹ electron volts provides a probe with which to study how particle acceleration responds to environmental effects such as shock propagation in dense clouds and how accelerated particles are released into interstellar space.

Original language	English
Pages (from-to)	1103-1106
Number of pages	4
Journal	Science
Volume	327
Issue number	5969
DOIs	https://doi.org/10.1126/science.1182787
Publication status	Published - 26 Feb 2010
Externally published	Yes

Access to Document

10.1126/science.1182787

Cite this

Abdo, A. A., Ackermann, M., Ajello, M., Baldini, L., Ballet, J., Barbiellini, G., Baring, M. G., Bastieri, D., Baughman, B. M., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bregeon, J., Brez, A., Brigida, M., ... Ziegler, M. (2010). Gamma-ray emission from the shell of supernova remnant W44 revealed by the Fermi LAT. Science, 327(5969), 1103-1106. https://doi.org/10.1126/science.1182787

@article{ade7ee7744454a0ba99032a965584f80,

title = "Gamma-ray emission from the shell of supernova remnant W44 revealed by the Fermi LAT",

abstract = "Recent observations of supernova remnants (SNRs) hint that they accelerate cosmic rays to energies close to ∼1015 electron volts. However, the nature of the particles that produce the emission remains ambiguous. We report observations of SNR W44 with the Fermi Large Area Telescope at energies between 2 {\texttimes} 108 electron volts and 3 {\texttimes} 1011 electron volts. The detection of a source with a morphology corresponding to the SNR shell implies that the emission is produced by particles accelerated there. The gamma-ray spectrum is well modeled with emission from protons and nuclei. Its steepening above -109 electron volts provides a probe with which to study how particle acceleration responds to environmental effects such as shock propagation in dense clouds and how accelerated particles are released into interstellar space.",

author = "Abdo, \{A. A.\} and M. Ackermann and M. Ajello and L. Baldini and J. Ballet and G. Barbiellini and Baring, \{M. G.\} and D. Bastieri and Baughman, \{B. M.\} 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 A. Brez and M. Brigida and P. Bruel and Burnett, \{T. H.\} and S. Buson and Caliandro, \{G. A.\} and Cameron, \{R. A.\} and Caraveo, \{P. A.\} and Casandjian, \{J. M.\} and C. Cecchi and {\"O} {\c C}elik and A. Chekhtman and Cheung, \{C. C.\} and J. Chiang and S. Ciprini and R. Claus and I. Cognard and J. Cohen-Tanugi and Cominsky, \{L. R.\} and J. Conrad and S. Cutini and Dermer, \{C. D.\} and \{De Angelis\}, A. and \{De Palma\}, F. and Digel, \{S. W.\} and \{Do Couto E Silva\}, E. and Drell, \{P. S.\} and R. Dubois and D. Dumora and C. Espinoza and C. Farmer and C. Favuzzi and Fegan, \{S. J.\} and Focke, \{W. B.\} and P. Fortin and M. Frailis and Y. Fukazawa and S. Funk and P. Fusco and F. Gargano and D. Gasparrini and N. Gehrels and S. Germani and G. Giavitto and B. Giebels and N. Giglietto and F. Giordano and T. Glanzman and G. Godfrey and Grenier, \{I. A.\} and Grondin, \{M. H.\} and Grove, \{J. E.\} and L. Guillemot and S. Guiriec and Y. Hanabata and Harding, \{A. K.\} and M. Hayashida and E. Hays and Hughes, \{R. E.\} and Jackson, \{M. S.\} and G. J{\'o}hannesson and Johnson, \{A. S.\} and Johnson, \{T. J.\} and Johnson, \{W. N.\} and T. Kamae and H. Katagiri and J. Kataoka and J. Katsuta and N. Kawai and M. Kerr and J. Kn{\"o}dlseder and Kocian, \{M. L.\} and M. Kramer and M. Kuss and J. Lande and L. Latronico and M. Lemoine-Goumard and F. Longo and F. Loparco and B. Lott and Lovellette, \{M. N.\} and P. Lubrano and Lyne, \{A. G.\} and Madejski, \{G. M.\} and A. Makeev and Mazziotta, \{M. N.\} and McEnery, \{J. E.\} and C. Meurer and Michelson, \{P. F.\} and W. Mitthumsiri and T. Mizuno and C. Monte and Monzani, \{M. E.\} and A. Morselli and Moskalenko, \{I. V.\} and S. Murgia and T. Nakamori and Nolan, \{P. L.\} and Noms, \{J. P.\} and A. Noutsos and E. Nuss and T. Ohsugi and N. Omodei and E. Orlando and Ormes, \{J. F.\} and D. Paneque and D. Parent and V. Pelassa and M. Pepe and M. Pesce-Rollins and F. Piron and Porter, \{T. A.\} and S. Rain{\`o} and R. Rando and M. Razzano and A. Reimer and O. Reimer and T. Reposeur and Rodriguez, \{A. Y.\} and Romani, \{R. W.\} and M. Roth and F. Ryde and Sadrozinski, \{H. F.W.\} and D. Sanchez and A. Sander and \{Saz Parkinson\}, \{P. M.\} and Scargle, \{J. D.\} and C. Sgr{\`o} and Siskind, \{E. J.\} and Smith, \{D. A.\} and Smith, \{P. D.\} and G. Spandre and P. Spinelli and Stappers, \{B. W.\} and Stecker, \{F. W.\} and Strikman, \{M. S.\} and Suson, \{D. J.\} and H. Tajima and H. Takahashi and T. Takahashi and T. Tanaka and Thayer, \{J. B.\} and Thayer, \{J. G.\} and G. Theureau and Thompson, \{D. J.\} and L. Tibaldo and O. Tibolla and Torres, \{D. F.\} and G. Tosti and A. Tramacere and Y. Uchiyama and Usher, \{T. L.\} and V. Vasileiou and C. Venter and N. Vilchez and V. Vitale and Waite, \{A. P.\} and P. Wang and Winer, \{B. L.\} and Wood, \{K. S.\} and R. Yamazaki and T. Ylinen and M. Ziegler",

year = "2010",

month = feb,

day = "26",

doi = "10.1126/science.1182787",

language = "English",

volume = "327",

pages = "1103--1106",

journal = "Science",

issn = "0036-8075",

publisher = "American Association for the Advancement of Science",

number = "5969",

}

Abdo, AA, Ackermann, M, Ajello, M, Baldini, L, Ballet, J, Barbiellini, G, Baring, MG, Bastieri, D, Baughman, BM, Bechtol, K, Bellazzini, R, Berenji, B, Blandford, RD, Bloom, ED, Bonamente, E, Borgland, AW, Bregeon, J, Brez, A, Brigida, M, Bruel, P, Burnett, TH, Buson, S, Caliandro, GA, Cameron, RA, Caraveo, PA, Casandjian, JM, Cecchi, C, Çelik, Ö, Chekhtman, A, Cheung, CC, Chiang, J, Ciprini, S, Claus, R, Cognard, I, Cohen-Tanugi, J, Cominsky, LR, Conrad, J, Cutini, S, Dermer, CD, De Angelis, A, De Palma, F, Digel, SW, Do Couto E Silva, E, Drell, PS, Dubois, R, Dumora, D, Espinoza, C, Farmer, C, Favuzzi, C, Fegan, SJ, Focke, WB, Fortin, P, Frailis, M, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Gehrels, N, Germani, S, Giavitto, G, Giebels, B, Giglietto, N, Giordano, F, Glanzman, T, Godfrey, G, Grenier, IA, Grondin, MH, Grove, JE, Guillemot, L, Guiriec, S, Hanabata, Y, Harding, AK, Hayashida, M, Hays, E, Hughes, RE, Jackson, MS, Jóhannesson, G, Johnson, AS, Johnson, TJ, Johnson, WN, Kamae, T, Katagiri, H, Kataoka, J, Katsuta, J, Kawai, N, Kerr, M, Knödlseder, J, Kocian, ML, Kramer, M, Kuss, M, Lande, J, Latronico, L, Lemoine-Goumard, M, Longo, F, Loparco, F, Lott, B, Lovellette, MN, Lubrano, P, Lyne, AG, Madejski, GM, Makeev, A, Mazziotta, MN, McEnery, JE, Meurer, C, Michelson, PF, Mitthumsiri, W, Mizuno, T, Monte, C, Monzani, ME, Morselli, A, Moskalenko, IV, Murgia, S, Nakamori, T, Nolan, PL, Noms, JP, Noutsos, A, Nuss, E, Ohsugi, T, Omodei, N, Orlando, E, Ormes, JF, Paneque, D, Parent, D, Pelassa, V, Pepe, M, Pesce-Rollins, M, Piron, F, Porter, TA, Rainò, S, Rando, R, Razzano, M, Reimer, A, Reimer, O, Reposeur, T, Rodriguez, AY, Romani, RW, Roth, M, Ryde, F, Sadrozinski, HFW, Sanchez, D, Sander, A, Saz Parkinson, PM, Scargle, JD, Sgrò, C, Siskind, EJ, Smith, DA, Smith, PD, Spandre, G, Spinelli, P, Stappers, BW, Stecker, FW, Strikman, MS, Suson, DJ, Tajima, H, Takahashi, H, Takahashi, T, Tanaka, T, Thayer, JB, Thayer, JG, Theureau, G, Thompson, DJ, Tibaldo, L, Tibolla, O, Torres, DF, Tosti, G, Tramacere, A, Uchiyama, Y, Usher, TL, Vasileiou, V, Venter, C, Vilchez, N, Vitale, V, Waite, AP, Wang, P, Winer, BL, Wood, KS, Yamazaki, R, Ylinen, T & Ziegler, M 2010, 'Gamma-ray emission from the shell of supernova remnant W44 revealed by the Fermi LAT', Science, vol. 327, no. 5969, pp. 1103-1106. https://doi.org/10.1126/science.1182787

TY - JOUR

T1 - Gamma-ray emission from the shell of supernova remnant W44 revealed by the Fermi LAT

AU - Abdo, A. A.

AU - Ackermann, M.

AU - Ajello, M.

AU - Baldini, L.

AU - Ballet, J.

AU - Barbiellini, G.

AU - Baring, M. G.

AU - Bastieri, D.

AU - Baughman, B. M.

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 - Brez, A.

AU - Brigida, M.

AU - Bruel, P.

AU - Burnett, T. H.

AU - Buson, S.

AU - Caliandro, G. A.

AU - Cameron, R. A.

AU - Caraveo, P. A.

AU - Casandjian, J. M.

AU - Cecchi, C.

AU - Çelik, Ö

AU - Chekhtman, A.

AU - Cheung, C. C.

AU - Chiang, J.

AU - Ciprini, S.

AU - Claus, R.

AU - Cognard, I.

AU - Cohen-Tanugi, J.

AU - Cominsky, L. R.

AU - Conrad, J.

AU - Cutini, S.

AU - Dermer, C. D.

AU - De Angelis, A.

AU - De Palma, F.

AU - Digel, S. W.

AU - Do Couto E Silva, E.

AU - Drell, P. S.

AU - Dubois, R.

AU - Dumora, D.

AU - Espinoza, C.

AU - Farmer, C.

AU - Favuzzi, C.

AU - Fegan, S. J.

AU - Focke, W. B.

AU - Fortin, P.

AU - Frailis, M.

AU - Fukazawa, Y.

AU - Funk, S.

AU - Fusco, P.

AU - Gargano, F.

AU - Gasparrini, D.

AU - Gehrels, N.

AU - Germani, S.

AU - Giavitto, G.

AU - Giebels, B.

AU - Giglietto, N.

AU - Giordano, F.

AU - Glanzman, T.

AU - Godfrey, G.

AU - Grenier, I. A.

AU - Grondin, M. H.

AU - Grove, J. E.

AU - Guillemot, L.

AU - Guiriec, S.

AU - Hanabata, Y.

AU - Harding, A. K.

AU - Hayashida, M.

AU - Hays, E.

AU - Hughes, R. E.

AU - Jackson, M. S.

AU - Jóhannesson, G.

AU - Johnson, A. S.

AU - Johnson, T. J.

AU - Johnson, W. N.

AU - Kamae, T.

AU - Katagiri, H.

AU - Kataoka, J.

AU - Katsuta, J.

AU - Kawai, N.

AU - Kerr, M.

AU - Knödlseder, J.

AU - Kocian, M. L.

AU - Kramer, M.

AU - Kuss, M.

AU - Lande, J.

AU - Latronico, L.

AU - Lemoine-Goumard, M.

AU - Longo, F.

AU - Loparco, F.

AU - Lott, B.

AU - Lovellette, M. N.

AU - Lubrano, P.

AU - Lyne, A. G.

AU - Madejski, G. M.

AU - Makeev, A.

AU - Mazziotta, M. N.

AU - McEnery, J. E.

AU - Meurer, C.

AU - Michelson, P. F.

AU - Mitthumsiri, W.

AU - Mizuno, T.

AU - Monte, C.

AU - Monzani, M. E.

AU - Morselli, A.

AU - Moskalenko, I. V.

AU - Murgia, S.

AU - Nakamori, T.

AU - Nolan, P. L.

AU - Noms, J. P.

AU - Noutsos, A.

AU - Nuss, E.

AU - Ohsugi, T.

AU - Omodei, N.

AU - Orlando, E.

AU - Ormes, J. F.

AU - Paneque, D.

AU - Parent, D.

AU - Pelassa, V.

AU - Pepe, M.

AU - Pesce-Rollins, M.

AU - Piron, F.

AU - Porter, T. A.

AU - Rainò, S.

AU - Rando, R.

AU - Razzano, M.

AU - Reimer, A.

AU - Reimer, O.

AU - Reposeur, T.

AU - Rodriguez, A. Y.

AU - Romani, R. W.

AU - Roth, M.

AU - Ryde, F.

AU - Sadrozinski, H. F.W.

AU - Sanchez, D.

AU - Sander, A.

AU - Saz Parkinson, P. M.

AU - Scargle, J. D.

AU - Sgrò, C.

AU - Siskind, E. J.

AU - Smith, D. A.

AU - Smith, P. D.

AU - Spandre, G.

AU - Spinelli, P.

AU - Stappers, B. W.

AU - Stecker, F. W.

AU - Strikman, M. S.

AU - Suson, D. J.

AU - Tajima, H.

AU - Takahashi, H.

AU - Takahashi, T.

AU - Tanaka, T.

AU - Thayer, J. B.

AU - Thayer, J. G.

AU - Theureau, G.

AU - Thompson, D. J.

AU - Tibaldo, L.

AU - Tibolla, O.

AU - Torres, D. F.

AU - Tosti, G.

AU - Tramacere, A.

AU - Uchiyama, Y.

AU - Usher, T. L.

AU - Vasileiou, V.

AU - Venter, C.

AU - Vilchez, N.

AU - Vitale, V.

AU - Waite, A. P.

AU - Wang, P.

AU - Winer, B. L.

AU - Wood, K. S.

AU - Yamazaki, R.

AU - Ylinen, T.

AU - Ziegler, M.

PY - 2010/2/26

Y1 - 2010/2/26

N2 - Recent observations of supernova remnants (SNRs) hint that they accelerate cosmic rays to energies close to ∼1015 electron volts. However, the nature of the particles that produce the emission remains ambiguous. We report observations of SNR W44 with the Fermi Large Area Telescope at energies between 2 × 108 electron volts and 3 × 1011 electron volts. The detection of a source with a morphology corresponding to the SNR shell implies that the emission is produced by particles accelerated there. The gamma-ray spectrum is well modeled with emission from protons and nuclei. Its steepening above -109 electron volts provides a probe with which to study how particle acceleration responds to environmental effects such as shock propagation in dense clouds and how accelerated particles are released into interstellar space.

AB - Recent observations of supernova remnants (SNRs) hint that they accelerate cosmic rays to energies close to ∼1015 electron volts. However, the nature of the particles that produce the emission remains ambiguous. We report observations of SNR W44 with the Fermi Large Area Telescope at energies between 2 × 108 electron volts and 3 × 1011 electron volts. The detection of a source with a morphology corresponding to the SNR shell implies that the emission is produced by particles accelerated there. The gamma-ray spectrum is well modeled with emission from protons and nuclei. Its steepening above -109 electron volts provides a probe with which to study how particle acceleration responds to environmental effects such as shock propagation in dense clouds and how accelerated particles are released into interstellar space.

UR - https://www.scopus.com/pages/publications/77649202347

U2 - 10.1126/science.1182787

DO - 10.1126/science.1182787

M3 - Article

AN - SCOPUS:77649202347

SN - 0036-8075

VL - 327

SP - 1103

EP - 1106

JO - Science

JF - Science

IS - 5969

ER -

Gamma-ray emission from the shell of supernova remnant W44 revealed by the Fermi LAT

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