Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for Gamma-ray Emission from Galactic Novae with the Fermi-LAT   Context. A number of novae have been found to emit high-energy gamma rays
(>100 MeV). However, the origin of this emission is not yet understood. We
report on the search for gamma-ray emission from 75 optically-detected Galactic
novae in the first 7.4 years of operation of the Fermi Large Area Telescope
using the Pass 8 data set. Aims. We compile an optical nova catalog including
light curves from various resources and estimate the optical peak time and
optical peak magnitude in order to search for gamma-ray emission to test if all
novae are gamma-ray emitters. Methods. We repeat the analysis of the six novae
previously identified as gamma-ray sources and develop a unified analysis
strategy which we then apply to all novae in our catalog. We search for
emission in a 15-day time window in two-day steps ranging from 20 days before
to 20 days after the optical peak time. We perform a population study with
Monte Carlo simulations to set constraints on the properties of the gamma-ray
emission of novae. Results. Two new novae candidates have been found at 2sigma
global significance. Although these two novae candidates were not detected at a
significant level individually, taking them together with the other
non-detected novae, we found a sub-threshold nova population with a cumulative
3sigma significance. We report the measured gamma-ray flux for detected sources
and flux upper limits for novae without significant detection. Our results can
be reproduced by several gamma-ray emissivity models (e.g. a power-law
distribution with a slope of 2), while a constant emissivity model (i.e.
assuming novae are standard candles) can be rejected.

4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas