微类星体LS I +61 303的可变甚高能伽马射线辐射。

Variable very-high-energy gamma-ray emission from the microquasar LS I +61 303.

作者信息

Albert J, Aliu E, Anderhub H, Antoranz P, Armada A, Asensio M, Baixeras C, Barrio J A, Bartelt M, Bartko H, Bastieri D, Bavikadi S R, Bednarek W, Berger K, Bigongiari C, Biland A, Bisesi E, Bock R K, Bordas P, Bosch-Ramon V, Bretz T, Britvitch I, Camara M, Carmona E, Chilingarian A, Ciprini S, Coarasa J A, Commichau S, Contreras J L, Cortina J, Curtef V, Danielyan V, Dazzi F, De Angelis A, de Los Reyes R, De Lotto B, Domingo-Santamaría E, Dorner D, Doro M, Errando M, Fagiolini M, Ferenc D, Fernández E, Firpo R, Flix J, Fonseca M V, Font L, Fuchs M, Galante N, Garczarczyk M, Gaug M, Giller M, Goebel F, Hakobyan D, Hayashida M, Hengstebeck T, Höhne D, Hose J, Hsu C C, Isar P G, Jacon P, Kalekin O, Kosyra R, Kranich D, Laatiaoui M, Laille A, Lenisa T, Liebing P, Lindfors E, Lombardi S, Longo F, López J, López M, Lorenz E, Lucarelli F, Majumdar P, Maneva G, Mannheim K, Mansutti O, Mariotti M, Martínez M, Mase K, Mazin D, Merck C, Meucci M, Meyer M, Miranda J M, Mirzoyan R, Mizobuchi S, Moralejo A, Nilsson K, Oña-Wilhelmi E, Orduña R, Otte N, Oya I, Paneque D, Paoletti R, Paredes J M, Pasanen M, Pascoli D, Pauss F, Pavel N, Pegna R, Persic M, Peruzzo L, Piccioli A, Poller M, Pooley G, Prandini E, Raymers A, Rhode W, Ribó M, Rico J, Riegel B, Rissi M, Robert A, Romero G E, Rügamer S, Saggion A, Sánchez A, Sartori P, Scalzotto V, Scapin V, Schmitt R, Schweizer T, Shayduk M, Shinozaki K, Shore S N, Sidro N, Sillanpää A, Sobczynska D, Stamerra A, Stark L S, Takalo L, Temnikov P, Tescaro D, Teshima M, Tonello N, Torres A, Torres D F, Turini N, Vankov H, Vitale V, Wagner R M, Wibig T, Wittek W, Zanin R, Zapatero J

机构信息

Universität Würzburg, D-97074 Würzburg, Germany.

出版信息

Science. 2006 Jun 23;312(5781):1771-3. doi: 10.1126/science.1128177. Epub 2006 May 18.

DOI:10.1126/science.1128177

PMID:16709745

Abstract

Microquasars are binary star systems with relativistic radio-emitting jets. They are potential sources of cosmic rays and can be used to elucidate the physics of relativistic jets. We report the detection of variable gamma-ray emission above 100 gigaelectron volts from the microquasar LS I 61 + 303. Six orbital cycles were recorded. Several detections occur at a similar orbital phase, which suggests that the emission is periodic. The strongest gamma-ray emission is not observed when the two stars are closest to one another, implying a strong orbital modulation of the emission or absorption processes.

摘要

微类星体是具有相对论性射电喷流的双星系统。它们是宇宙射线的潜在来源，可用于阐明相对论性喷流的物理机制。我们报告了在微类星体LS I 61 + 303中探测到能量高于100吉电子伏特的可变伽马射线发射。记录了六个轨道周期。在相似的轨道相位出现了几次探测结果，这表明发射是周期性的。当两颗恒星彼此最接近时并未观测到最强的伽马射线发射，这意味着发射或吸收过程存在强烈的轨道调制。