The First Fermi-LAT SNR Catalog and Cosmic Ray Implications

被引：0
|
作者：
de Palma, F. [1 ,2 ]
Brandt, T. J. [3 ]
Hewitt, J. W. [4 ]
机构：
[1] Ist Nazl Fis Nucl, Sez Bari, Bari, Italy
[2] Univ Telemat Pegaso, Piazza Trieste Trento 48, I-80132 Naples, Italy
[3] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA
[4] Univ North Florida, Jacksonville, FL 32224 USA
来源：
RICAP16, 6TH ROMA INTERNATIONAL CONFERENCE ON ASTROPARTICLE PHYSICS | 2017年 / 136卷
基金：
瑞典研究理事会;
关键词：
D O I：
10.1051/epjconf/201713603009
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
While supernova remnants (SNRs) are widely thought to be powerful cosmicray accelerators, indirect evidence comes from a small number of well-studied cases. Here we systematically determine the gamma-ray emission detected by the Fermi Large Area Telescope (LAT) from all known Galactic SNRs, disentangling them from the sea of cosmic-ray generated photons in the Galactic plane. Using LAT data we have characterized the 1-100 GeV emission in 279 regions containing SNRs, accounting for systematic uncertainties caused by source misattribution and instrumental response. We classified 30 sources as SNRs, using spatial overlap with the radio emission position. For all the remaining regions we evaluated upper limits on SNRs' emission. In the First Fermi-LAT SNR Catalog there is a study of the common characteristics of these SNRs, such as comparisons between GeV, radio and TeV quantities. We show that previously satisfactory models of SNRs' GeV emission no longer adequately describe the data. To address the question of cosmic ray (CR) origins, we also examine the SNRs' maximal CR contribution assuming the GeV emission arises solely from proton interactions. Improved breadth and quality of multiwavelength (MW) data, including distances and local densities, and more, higher resolution gamma-ray data with correspondingly improved Galactic diffuse models will strengthen this constraint.
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