2012A&A...547A.114A


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.25CET03:10:35

2012A&A...547A.114A - Astronomy and Astrophysics, volume 547A, 114-114 (2012/11-1)

Cold ultrarelativistic pulsar winds as potential sources of galactic gamma-ray lines above 100 GeV.

AHARONIAN F., KHANGULYAN D. and MALYSHEV D.

Abstract (from CDS):

The evidence of line-like spectral features above 100 GeV, in particular at 130 GeV, which have been recently reported from some parts of the Galactic plane, poses serious challenges for any interpretation of this surprise discovery. It is generally believed that the unusually narrow profile of the spectral line cannot be explained by conventional processes in astrophysical objects, and, if real, is likely to be associated with dark matter. In this paper we argue that cold ultrarelativistic pulsar winds can be alternative sources of very narrow gamma-ray lines.We demonstrate that Comptonization of a cold ultrarelativistic electron-positron pulsar wind in the deep Klein-Nishina regime can readily provide very narrow (ΔE/E≤0.2) distinct gamma-ray line features. To verify this prediction, we produced photon-count maps based on the Fermi LAT data in the energy interval 100 to 140 GeV.We confirm earlier reports of the presence of marginal gamma-ray line-like signals from three regions of the Galactic plane. Although the maps show some structure inside these regions, unfortunately the limited photon statistics do not allow any firm conclusion in this regard.The confirmation of 130 GeV line emission by low-energy threshold atmospheric Cherenkov telescope systems, in particular by the new 28m diameter dish of the H.E.S.S. array, would be crucial for resolving the spatial structure of the reported hotspots, and thus for distinguishing between the dark matter and pulsar origins of the ``Fermi Lines''.

Abstract Copyright:

Journal keyword(s): radiation mechanisms: non-thermal - methods: analytical - pulsars: general - gamma rays: diffuse background

CDS comments: Table 1 hot spots not in Simbad.

Simbad objects: 11

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Number of rows : 11

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 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           F 4739 1
2 CPD-63 2495 HXB 13 02 47.6541729595 -63 50 08.625922862 10.34 10.72 9.98 10.03   O9.5Ve 661 1
3 PSR J1718-3825 Psr 17 18 13.576 -38 25 18.56           ~ 72 0
4 NAME Tornado Nebula SNR 17 40 16.360 -30 58 18.87           ~ 135 0
5 2CG 359+00 gam 17 45 11 -30 11.9           ~ 87 0
6 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11178 0
7 NAME Sgr A East Rad 17 45 41 -29 00.8           ~ 436 2
8 3FGL J1754.0-2930 gam 17 53 56.59 -29 29 53.5           ~ 14 0
9 1FGL J1823.2-1336c gam 18 23 05.97 -13 40 00.7           ~ 18 0
10 PSR B1823-13 Psr 18 26 13.06 -13 34 48.1           ~ 345 1
11 SNR G020.0-00.2 SNR 18 28 07.000 -11 35 00.00           ~ 53 0

    Equat.    Gal    SGal    Ecl

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2020.01.25-03:10:35

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