Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of high energy cosmic ray acceleration in Tycho SNR with VERITAS   Supernova Remnants (SNRs) are broadly accepted as the main accelerators of
Galactic cosmic rays (GCRs) with energies up to the knee region. Recent
measurements of pion bumps in IC 443 and W 44 by Fermi-LAT show indirect
evidence of the acceleration of hadronic particles in SNRs. But, whether SNRs
are the powerhouses for GCR acceleration all the way up to the knee region
still remains an unsolved question. Tycho is a promising target for this study
because it has been widely studied in multi-wavelength observations from IR to
TeV and it is a young type Ia SNR located in a relatively clean environment.
Though recently developed models generally agree on the likely hadronic origin
of the gamma-ray emission from Tycho, the details of the models vary
considerably because the current data in the GeV-TeV range are weakly
constraining. Since the initial detection, VERITAS has increased its data size
by more than 40%. We also recently upgraded the telescope cameras and the
analysis packages, which will allow us to extend the measurements toward both
lower and higher energies. In this talk, I present updates on the VHE gamma-ray
measurements of Tycho with VERITAS, focusing on the interpretation of the
additional data in the context of hadronic GCR acceleration models.

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The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: solv-int
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph