کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8141919 | 1523854 | 2016 | 23 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The characterization of the gamma-ray signal from the central Milky Way: A case for annihilating dark matter
ترجمه فارسی عنوان
مشخصه سیگنال گاما را از راه شیری مرکزی: یک مورد برای نابودی ماده تاریک
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کلمات کلیدی
ماده تاریک، تشخیص غیر مستقیم، اشعه گاما،
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
نجوم و فیزیک نجومی
چکیده انگلیسی
Past studies have identified a spatially extended excess of â¼1-3Â GeV gamma rays from the region surrounding the Galactic Center, consistent with the emission expected from annihilating dark matter. We revisit and scrutinize this signal with the intention of further constraining its characteristics and origin. By applying cuts to the Fermi event parameter CTBCORE, we suppress the tails of the point spread function and generate high resolution gamma-ray maps, enabling us to more easily separate the various gamma-ray components. Within these maps, we find the GeV excess to be robust and highly statistically significant, with a spectrum, angular distribution, and overall normalization that is in good agreement with that predicted by simple annihilating dark matter models. For example, the signal is very well fit by a 36-51Â GeV dark matter particle annihilating to bbÌ with an annihilation cross section of Ïv=(1â3)Ã10â26cm3/s (normalized to a local dark matter density of 0.4GeV/cm3). Furthermore, we confirm that the angular distribution of the excess is approximately spherically symmetric and centered around the dynamical center of the Milky Way (within â¼0.05â of Sgr Aâ), showing no sign of elongation along the Galactic Plane. The signal is observed to extend to at least â10â from the Galactic Center, which together with its other morphological traits disfavors the possibility that this emission originates from previously known or modeled pulsar populations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Dark Universe - Volume 12, June 2016, Pages 1-23
Journal: Physics of the Dark Universe - Volume 12, June 2016, Pages 1-23
نویسندگان
Tansu Daylan, Douglas P. Finkbeiner, Dan Hooper, Tim Linden, Stephen K.N. Portillo, Nicholas L. Rodd, Tracy R. Slatyer,