Query : 2016A&A...589A..51S

2016A&A...589A..51S - Astronomy and Astrophysics, volume 589A, 51-51 (2016/5-1)

The environment of the γ-ray emitting SNR G338.3-0.0: a hadronic interpretation for HESS J1640-465.


Abstract (from CDS):

The supernova remnant (SNR) G338.3-0.0 spatially correlates with HESS J1640-465, which is considered the most luminous γ-ray source associated with a SNR in our Galaxy. The X-ray pulsar PSR J1640-4631 has been recently discovered within the SNR shell, which could favor a leptonic origin for the detected very-high-energy (VHE) emission. In spite of this, the origin of the VHE radiation from HESS J1640-465 has not been unambiguously clarified so far. Indeed, a hadronic explanation cannot be ruled out by current observations. On the basis of atomic (HI) and molecular (12CO) archival data, we determine, for the first time, the total ambient density of protons in the region of the G338.3-0.0/HESS J1640-465 system, a critical parameter for understanding the emission mechanisms at very high energies. The value obtained is in the 100-130cm–3 range. Besides this, we developed a new hadronic model to describe the spectral energy distribution (SED) of the HESS J1640-465 source, which includes the latest total γ-ray cross-section for proton-proton collisions available in the literature. By using the assessed ambient proton density, we found that the total energy in accelerated protons required to fit the data is 5.4+4.7–2.3x1049erg and 1.6+1.4–0.7x1050erg for a source distance of 8.5 and 13kpc, respectively. The case where the source distance is 8.5kpc agrees with the typical scenario in which the energy released is on the order of 1051erg and ∼10% of that energy is transferred to the accelerated protons, whereas the case corresponding to a source distance of 13kpc requires either a higher value of the energy released in the explosion or a larger energy fraction to accelerate protons.

Abstract Copyright: © ESO, 2016

Journal keyword(s): ISM: supernova remnants - ISM: individual objects: SNR G338.3-0.0 - gamma rays: ISM

CDS comments: G338.364+00.020 is [CPA2006] S33 in SIMBAD.

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 GAL 338.40+00.16 HII 16 40 14.2 -46 20 54           ~ 12 0
2 3EG J1639-4702 gam 16 40 30.0 -46 33 00           ~ 154 2
3 AGAL G338.307+00.006 Y*O 16 40 34 -46 31.3           ~ 6 0
4 PSR J1640-4631 Psr 16 40 43.52 -46 31 35.4           ~ 55 0
5 GAL 338.4+00.1 HII 16 40 49.2 -46 24 05           ~ 19 0
6 GAL 338.45+00.06 HII 16 40 53.1 -46 22 41           ~ 11 0
7 [ABB2014] WISE G338.364-00.020 bub 16 40 54.7 -46 29 52           ~ 5 0
8 HESS J1641-463 gam 16 41 01.7 -46 18 11           ~ 24 0

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