Repozitorij Univerze v Novi Gorici

Iskanje po repozitoriju
A+ | A- | Pomoč | SLO | ENG

Iskalni niz: išči po
išči po
išči po
išči po
* po starem in bolonjskem študiju

Opcije:
  Ponastavi


1 - 4 / 4
Na začetekNa prejšnjo stran1Na naslednjo stranNa konec
1.
FERMI-LAT OBSERVATIONS OF HIGH-ENERGY γ-RAY EMISSION TOWARD THE GALACTIC CENTER
Gabrijela Zaharijas, B. L. Winer, 2016, izvirni znanstveni članek

Opis: The Fermi Large Area Telescope (LAT) has provided the most detailed view to date of the emission toward the Galactic center (GC) in high-energy γ-rays. This paper describes the analysis of data taken during the first 62 months of the mission in the energy range 1–100 GeV from a 15° × 15° region about the direction of the GC. Specialized interstellar emission models (IEMs) are constructed to enable the separation of the γ-ray emissions produced by cosmic ray particles interacting with the interstellar gas and radiation fields in the Milky Way into that from the inner ∼1 kpc surrounding the GC, and that from the rest of the Galaxy. A catalog of point sources for the 15° × 15° region is self-consistently constructed using these IEMs: the First Fermi-LAT Inner Galaxy Point Source Catalog (1FIG). The spatial locations, fluxes, and spectral properties of the 1FIG sources are presented, and compared with γ-ray point sources over the same region taken from existing catalogs. After subtracting the interstellar emission and point-source contributions a residual is found. If templates that peak toward the GC are used to model the positive residual the agreement with the data improves, but none of the additional templates tried account for all of its spatial structure. The spectrum of the positive residual modeled with these templates has a strong dependence on the choice of IEM.
Najdeno v: ključnih besedah
Povzetek najdenega: ...cosmic rays – Galaxy: center – gamma-rays: generalgamma-rays: ISM – radiation mechanisms: non-thermal...
Ključne besede: cosmic rays – Galaxy: center – gamma-rays: general – gamma-rays: ISM – radiation mechanisms: non-thermal
Objavljeno: 02.03.2016; Ogledov: 3357; Prenosov: 218
.pdf Polno besedilo (6,36 MB)

2.
The Fermi Galactic Center GeV Excess and Implications for Dark Matter
Gabrijela Zaharijas, 2017, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...center – Galaxy: halo – gamma rays: general – ISM: general...
Ključne besede: cosmic rays – Galaxy: bulge – Galaxy: center – Galaxy: halo – gamma rays: general – ISM: general
Objavljeno: 13.07.2017; Ogledov: 2530; Prenosov: 0
.pdf Polno besedilo (7,21 MB)

3.
4.
Search for point sources of ultra-high-energy photons with the Telescope Array surface detector
J. P. Lundquist, R.U. Abbasi, 2020, izvirni znanstveni članek

Opis: The surface detector (SD) of the Telescope Array (TA) experiment allows us to detect indirectly photons with energies of the order of 10^18 eV and higher, and to separate photons from the cosmic ray background. In this paper, we present the results of a blind search for point sources of ultra-high-energy (UHE) photons in the Northern sky using the TA SD data. The photon-induced extensive air showers are separated from the hadron-induced extensive air shower background by means of a multivariate classifier based upon 16 parameters that characterize the air shower events. No significant evidence for the photon point sources is found. The upper limits are set on the flux of photons from each particular direction in the sky within the TA field of view, according to the experiment’s angular resolution for photons. The average 95 per cent confidence level upper-limits for the point-source flux of photons with energies greater than 10^18, 10^18.5, 10^19, 10^19.5 and 10^20 eV are 0.094, 0.029, 0.010, 0.0073 and 0.0058 km−2yr−1, respectively. For energies higher than 10^18.5 eV, the photon point-source limits are set for the first time. Numerical results for each given direction in each energy range are provided as a supplement to this paper.
Najdeno v: ključnih besedah
Povzetek najdenega: ...methods: data analysis, cosmic rays, gamma-rays: general...
Ključne besede: methods: data analysis, cosmic rays, gamma-rays: general
Objavljeno: 29.04.2020; Ogledov: 1193; Prenosov: 0
.pdf Polno besedilo (1,05 MB)

Iskanje izvedeno v 0 sek.
Na vrh