2008A&A...480..847O


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.25CET16:38:24

2008A&A...480..847O - Astronomy and Astrophysics, volume 480, 847-857 (2008/3-4)

Gamma-ray emission from the solar halo and disk: a study with EGRET data.

ORLANDO E. and STRONG A.W.

Abstract (from CDS):

The Sun has recently been predicted to be an extended source of gamma-ray emission, produced by inverse-Compton (IC) scattering of cosmic-ray (CR) electrons on the solar radiation field. The emission was predicted to be extended and a confusing foreground for the diffuse extragalactic background even at large angular distances from the Sun. The solar disk is also expected to be a steady gamma-ray source. While these emissions are expected to be readily detectable in the future by GLAST, the situation for available EGRET data is more challenging. The theory of gamma-ray emission from IC scattering on the solar radiation field by Galactic CR electrons is given in detail. This is used as the basis for detection and model verification using EGRET data. We present a detailed study of the solar emission using the EGRET database, accounting for the effect of the emission from 3C 279, the moon, and other sources, which interfere with the solar emission. The analysis was performed for 2 energy ranges, above 300MeV and for 100-300MeV, as well as for the combination to improve the detection statistics. The technique was tested on the moon signal, with our results consistent with previous work. Analyzing the EGRET database, we find evidence of emission from the solar disk and its halo. The observations are compared with our model for the extended emission. The spectrum of the solar disk emission and the spectrum of the extended emission have been obtained. The spectrum of the moon is also given. The observed intensity distribution and the flux are consistent with the predicted model of IC gamma-rays from the halo around the Sun.

Abstract Copyright:

Journal keyword(s): methods: data analysis - Moon - Sun: X-rays, gamma rays - gamma rays: observations - gamma rays: theory

Simbad objects: 9

goto Full paper

goto View the reference in ADS

Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 4C 15.05 Bla 02 04 50.41389571 +15 14 11.0436591   21.9 22.1 21.00   ~ 358 1
2 GRO J0215+11 gam 02 16 00.0 +11 22 48           ~ 21 0
3 4C -02.55 QSO 12 32 00.0157879377 -02 24 04.790684994   17.41 17.06 16.4   ~ 374 1
4 3EG J1235+0233 gam 12 35 +02.6           ~ 12 0
5 QSO J1246-0730 QSO 12 46 04.23210358 -07 30 46.5745473   17.6 18.0 18.2   ~ 163 1
6 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2662 2
7 3EG J1310-0517 gam 13 10 24.0 -05 18 00           ~ 16 0
8 QSO B1406-076 QSO 14 08 56.48120036 -07 52 26.6664200   20.3 18.4     ~ 258 1
9 QSO B2320-035 QSO 23 23 31.95375451 -03 17 05.0237932   18.6   18.16   ~ 163 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2008A&A...480..847O and select 'bookmark this link' or equivalent in the popup menu


2020.02.25-16:38:24

© Université de Strasbourg/CNRS

    • Contact