A Cocoon of Freshly Accelerated Cosmic Rays Detected by Fermi in the Cygnus Superbubble

The origin of Galactic cosmic rays is a century-long puzzle. Indirect evidence points to their acceleration by supernova Shockwaves, but we know little of their escape from the shock and their evolution through the turbulent medium surrounding massive stars. Gamma rays can probe their spreading thro...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Veröffentlicht in:	Science (American Association for the Advancement of Science) 2011-11, Vol.334 (6059), p.1103-1107
Hauptverfasser:	Ackermann, M., Ajello, M., Allafort, A., Ballet, J., Barbiellini, G., Bastieri, D., Belfiore, A., Bellazzini, R., Berenji, B., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bottacini, E., Brigida, M., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Casandjian, J. M., Cecchi, C., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., de Angelis, A., de Palma, F., Dermer, C. D., do Couto e Silva, E., Drell, P. S., Dumora, D., Favuzzi, C., Fegan, S. J., Fukazawa, Y., Fusco, P., Gargano, F., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Grenier, I. A., Guillemot, L., Harding, A. K., Hayashida, M., Hayashi, K., Hays, E., Jóhannesson, G., Johnson, A. S., Kamae, T., Katagiri, H., Kataoka, J., Kerr, M., Knödlseder, J., Lande, J., Latronico, L., Lee, S.-H., Loparco, F., Lott, B., Lubrano, P., Martin, P., Mazziotta, M. N., Michelson, P. F., Mizuno, T., Monte, C., Morselli, A., Moskalenko, I. V., Naumann-Godo, M., Nolan, P. L, Norris, J. P., Nuss, E., Ohsugi, T., Ormes, J. F., Parent, D., Pesce-Rollins, M., Piron, F., Pohl, M., Prokhorov, D., Ritz, S., Sgrò, C., Smith, P. D., Spinelli, P., Takahashi, H., Tanaka, T., Thayer, J. G., Thayer, J. B., Thompson, D. J., Tibaldo, L., Torres, D. F., Tramacere, A., Troja, E., Vandenbroucke, J., Vasileiou, V., Vianello, G., Vitale, V., Wang, P., Wood, K. S., Zimmer, S., Bontemps, S.
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomical observations Astronomy Astroparticle Physics Astropartikelfysik Astrophysics Cocoons Cosmic rays Cosmic rays (including sources, origin, acceleration, and interactions) Earth, ocean, space Electrons Exact sciences and technology Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations Gamma ray astronomy Gas spectroscopy Molecular clouds Physics Research universities Sciences of the Universe Shock waves Solar and Stellar Astrophysics Space research Stellar systems. Galactic and extragalactic objects and systems. The universe Superbubbles Unidentified sources and radiation outside the solar system γ-ray
Online-Zugang:	Volltext
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	The origin of Galactic cosmic rays is a century-long puzzle. Indirect evidence points to their acceleration by supernova Shockwaves, but we know little of their escape from the shock and their evolution through the turbulent medium surrounding massive stars. Gamma rays can probe their spreading through the ambient gas and radiation fields. The Fermi Large Area Telescope (LAT) has observed the star-forming region of Cygnus X. The 1-to 100-gigaelectronvolt images reveal a 50-parsec-wide cocoon of freshly accelerated cosmic rays that flood the cavities carved by the stellar winds and ionization fronts from young stellar clusters. It provides an example to study the youth of cosmic rays in a superbubble environment before they merge into the older Galactic population.
ISSN:	0036-8075 1095-9203 1095-9203
DOI:	10.1126/science.1210311