Gamma-ray observations of tycho’s supernova remnant with veritas andfermi
| العنوان: | Gamma-ray observations of tycho’s supernova remnant with veritas andfermi |
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| المؤلفون: | Q. Feng, P. T. Reynolds, C. A. Johnson, Wystan Benbow, A. Popkow, J. P. Finley, D. S. Hanna, B. Zitzer, Manel Errando, S. Kumar, D. B. Kieda, Karlen Shahinyan, Daniel Nieto, Henrike Fleischhack, Gernot Maier, Lucy Fortson, Moritz Hütten, David A. Williams, S. O'Brien, J. Tyler, M. Pohl, P. Kaaret, R. A. Ong, Thomas Weisgarber, Nahee Park, S. McArthur, J. H. Buckley, G. H. Sembroski, I. Sadeh, P. Wilcox, I. Telezhinsky, Jamie Holder, John L. Quinn, E. Pueschel, M. Buchovecky, P. Moriarty, P. Kar, A. N. Otte, S. Trepanier, Patrick Slane, A. J.R. Weinstein, A. Wilhelm, Ralph Bird, M. P. Connolly, D. Staszak, K. Ragan, Wei Cui, A. Archer, Gordon T. Richards, M. J. Lang, Marcos Santander, E. Roache, A. D. Falcone, Etienne Bourbeau, S. Archambault, Reshmi Mukherjee, Dwarkadas, N. Kelley-Hoskins, Bugaev, Matteo Cerruti, Amy Furniss, Sinéad M. Griffin, M. Kertzman, A. McCann, S. P. Wakely, Marita Krause |
| المصدر: | The astrophysical journal / 1 836(1), 23 (2017). doi:10.3847/1538-4357/836/1/23 |
| بيانات النشر: | American Astronomical Society, 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | molecular cloud, shock acceleration, Astrophysics::High Energy Astrophysical Phenomena, stars-supernovae, cosmic-rays, Astrophysics, Type (model theory), telescope, 01 natural sciences, 0103 physical sciences, emission, ddc:530, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, Spectral index, Range (particle radiation), particle-acceleration, 010308 nuclear & particles physics, brahes 1572 supernova, data behind figure, Gamma ray, Center (category theory), magnetic-field, electrons, Institut für Physik und Astronomie, individual(tycho's snr) supporting material, Astronomy and Astrophysics, gamma rays, Supernova, Space and Planetary Science, ddc:520, High Energy Physics::Experiment, high-energy, Energy (signal processing), Fermi Gamma-ray Space Telescope |
| الوصف: | The astrophysical journal 836(1), 23 (2017). doi:10.3847/1538-4357/836/1/23 High-energy gamma-ray emission from supernova remnants (SNRs) has provided a unique perspective for studies of Galactic cosmic-ray acceleration. Tycho's SNR is a particularly good target because it is a young, type Ia SNR that has been well-studied over a wide range of energies and located in a relatively clean environment. Since the detection of gamma-ray emission from Tycho's SNR by VERITAS and Fermi-LAT, there have been several theoretical models proposed to explain its broadband emission and high-energy morphology. We report on an update to the gamma-ray measurements of Tycho's SNR with 147 hr of VERITAS and 84 months of Fermi-LAT observations, which represent about a factor of two increase in exposure over previously published data. About half of the VERITAS data benefited from a camera upgrade, which has made it possible to extend the TeV measurements toward lower energies. The TeV spectral index measured by VERITAS is consistent with previous results, but the expanded energy range softens a straight power-law fit. At energies higher than 400 GeV, the power-law index is 2.92 ± 0.42$_{stat}$ ± 0.20$_{sys}$. It is also softer than the spectral index in the GeV energy range, 2.14 ± 0.09$_{stat}$ ± 0.02$_{sys}$, measured in this study using Fermi-LAT data. The centroid position of the gamma-ray emission is coincident with the center of the remnant, as well as with the centroid measurement of Fermi-LAT above 1 GeV. The results are consistent with an SNR shell origin of the emission, as many models assume. The updated spectrum points to a lower maximum particle energy than has been suggested previously. Published by IOP Publ., Chicago, Ill. [u.a.] |
| تدمد: | 1538-4357 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e33653b6b262a5d23b665f021188b6c1 http://hdl.handle.net/10379/10282 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....e33653b6b262a5d23b665f021188b6c1 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15384357 |
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