利用MAGIC观测蟹状脉冲星高于25 GeV的脉冲伽马射线。

Observation of pulsed gamma-rays above 25 GeV from the Crab pulsar with MAGIC.

作者信息

Aliu E, Anderhub H, Antonelli L A, Antoranz P, Backes M, Baixeras C, Barrio J A, Bartko H, Bastieri D, Becker J K, Bednarek W, Berger K, Bernardini E, Bigongiari C, Biland A, Bock R K, Bonnoli G, Bordas P, Bosch-Ramon V, Bretz T, Britvitch I, Camara M, Carmona E, Chilingarian A, Commichau S, Contreras J L, Cortina J, Costado M T, Covino S, Curtef V, Dazzi F, De Angelis A, De Cea Del Pozo E, de Los Reyes R, De Lotto B, De Maria M, De Sabata F, Delgado Mendez C, Dominguez A, Dorner D, Doro M, Elsässer D, Errando M, Fagiolini M, Ferenc D, Fernandez E, Firpo R, Fonseca M V, Font L, Galante N, Garcia Lopez R J, Garczarczyk M, Gaug M, Goebel F, Hadasch D, Hayashida M, Herrero A, Höhne D, Hose J, Hsu C C, Huber S, Jogler T, Kranich D, La Barbera A, Laille A, Leonardo E, Lindfors E, Lombardi S, Longo F, Lopez M, Lorenz E, Majumdar P, Maneva G, Mankuzhiyil N, Mannheim K, Maraschi L, Mariotti M, Martinez M, Mazin D, Meucci M, Meyer M, Miranda J M, Mirzoyan R, Moles M, Moralejo A, Nieto D, Nilsson K, Ninkovic J, Otte N, Oya I, Paoletti R, Paredes J M, Pasanen M, Pascoli D, Pauss F, Pegna R G, Perez-Torres M A, Persic M, Peruzzo L, Piccioli A, Prada F, Prandini E, Puchades N, Raymers A, Rhode W, Ribó M, Rico J, Rissi M, Robert A, Rügamer S, Saggion A, Saito T Y, Salvati M, Sanchez-Conde M, Sartori P, Satalecka K, Scalzotto V, Scapin V, Schweizer T, Shayduk M, Shinozaki K, Shore S N, Sidro N, Sierpowska-Bartosik A, Sillanpää A, Sobczynska D, Spanier F, Stamerra A, Stark L S, Takalo L, Tavecchio F, Temnikov P, Tescaro D, Teshima M, Tluczykont M, Torres D F, Turini N, Vankov H, Venturini A, Vitale V, Wagner R M, Wittek W, Zabalza V, Zandanel F, Zanin R, Zapatero J, de Jager O C, de Ona Wilhelmi E

出版信息

Science. 2008 Nov 21;322(5905):1221-4. doi: 10.1126/science.1164718. Epub 2008 Oct 16.

DOI:10.1126/science.1164718

PMID:18927358

Abstract

One fundamental question about pulsars concerns the mechanism of their pulsed electromagnetic emission. Measuring the high-end region of a pulsar's spectrum would shed light on this question. By developing a new electronic trigger, we lowered the threshold of the Major Atmospheric gamma-ray Imaging Cherenkov (MAGIC) telescope to 25 giga-electron volts. In this configuration, we detected pulsed gamma-rays from the Crab pulsar that were greater than 25 giga-electron volts, revealing a relatively high cutoff energy in the phase-averaged spectrum. This indicates that the emission occurs far out in the magnetosphere, hence excluding the polar-cap scenario as a possible explanation of our measurement. The high cutoff energy also challenges the slot-gap scenario.

摘要

关于脉冲星的一个基本问题涉及其脉冲电磁辐射的机制。测量脉冲星光谱的高端区域将有助于阐明这个问题。通过开发一种新的电子触发器，我们将大型大气伽马射线成像切伦科夫（MAGIC）望远镜的阈值降低到了25吉电子伏特。在这种配置下，我们探测到了来自蟹状脉冲星的能量大于25吉电子伏特的脉冲伽马射线，揭示了相平均光谱中相对较高的截止能量。这表明辐射发生在磁层的远处，因此排除了极冠模型作为我们测量结果的一种可能解释。高截止能量也对缝隙模型提出了挑战。