148 research outputs found
VERITAS and Fermi-LAT observations of TeV gamma-ray sources from the second HAWC catalog
The HAWC observatory recently published their second source catalog with 39
very high energy gamma-ray sources based on 507 days of exposure time. Among
these, there were 16 sources that are more than one degree away from any known
TeV source. We studied 13 of these 16 sources with VERITAS and
\textit{Fermi}-LAT data. VERITAS, an array of four imaging atmospheric
Cherenkov telescopes observing gamma rays with energies higher than 85 GeV, can
provide a more detailed image of the source with much shorter exposure time and
with better angular resolution. With \textit{Fermi}-LAT data, we searched for
the counterparts at lower energies (E>10 GeV). The exposure of VERITAS varies
among the 13 sources, and we used eight years of \textit{Fermi}-LAT data.
VERITAS found weak gamma-ray emission in the region of PWN~DA~495 coinciding
with 2HWC J1953+294 in this follow-up study. We will discuss the results
especially focusing on the PWN~DA~495 region and the SNR~G~54.1+0.3 region
where \textit{Fermi}-LAT detected a GeV counterpart of SNR~G~54.1+0.3, a known
TeV source detected by both VERITAS and HAWC.Comment: 8 pages, 3 figures, ICRC 2017 (Busan, South Korea
Status of ground based gamma-ray observations
This is a proceeding of a rapporteur talk given on ground-based gamma-ray
astronomy at the 35th International Cosmic-Ray Conference (ICRC) held in 2017
in Busan, Republic of Korea. A total of ~300 contributions were presented
during the ICRC over 17 gamma-ray sessions. Here, I summarize the contributions
mainly focusing on the source observations performed by ground-based gamma-ray
instruments and the connection between gamma rays and cosmic rays. Any such
summary must necessarily be incomplete. However, I have attempted to provide a
glance into recent progress that has been made in using ground-based gamma-ray
observations to understand the nature of high energy particles in our Universe.Comment: 2017 ICRC rapporteur talk, 23 pages, 9 figure
Non-5q Spinal Muscular Atrophy in a Patient With a Novel BICD2 Missense Variant
Variants in BICD cargo adapter 2 (BICD2) cause autosomal dominant spinal muscular atrophy with lower extremity dominance (SMALED2) which is characterized with lower extremity muscle weakness and atrophy. We describe a novel, heterozygous BICD2 variant (c.1661T>C, [p.Leu554Pro]) in a 21-month-old female patient with a more severe phenotypic presentation than the typical SMALED2 expression including arthrogryposis multiplex congenita, absent deep tendon reflexes, respiratory insufficiency, and cerebral depression. The variant p.Leu554Pro is located just outside of a domain that interacts with the motor protein KIF5A. The detailed neuro-phenotyping and clinical course presented here expand the understanding of BICD2 related disease
Non-5q Spinal Muscular Atrophy in a Patient With a Novel BICD2 Missense Variant
Variants in BICD cargo adapter 2 (BICD2) cause autosomal dominant spinal muscular atrophy with lower extremity dominance (SMALED2) which is characterized with lower extremity muscle weakness and atrophy. We describe a novel, heterozygous BICD2 variant (c.1661T>C, [p.Leu554Pro]) in a 21-month-old female patient with a more severe phenotypic presentation than the typical SMALED2 expression including arthrogryposis multiplex congenita, absent deep tendon reflexes, respiratory insufficiency, and cerebral depression. The variant p.Leu554Pro is located just outside of a domain that interacts with the motor protein KIF5A. The detailed neuro-phenotyping and clinical course presented here expand the understanding of BICD2 related disease
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