Query : 2013A&A...557L..15C

2013A&A...557L..15C - Astronomy and Astrophysics, volume 557, L15-15 (2013/9-1)

A hadronic scenario for HESS J1818-154.


Abstract (from CDS):

objS{SNR G015.4+00.1}{G15.4+0.1} is a faint supernova remnant (SNR) that has recently been associated with the γ-ray source HESS J1818-154. We investigate a hadronic scenario for the production of the γ-ray emission. Molecular 13CO (J=1-0) taken from the Galactic Ring Survey (GRS) and neutral hydrogen (HI) data from the Southern Galactic Plane Survey (SGPS) have been used in combination with new 1420MHz radio continuum observations carried out with the Giant Metrewave Radio Telescope (GMRT). From the new observations and analysis of archival data we provided for the first time a reliable estimate for the distance to the SNR G15.4+0.1 and discovered molecular clouds located at the same distance. On the basis of HI absorption features, we estimate the distance to G15.4+0.1 in 4.8±1.0kpc. The 13CO observations clearly show a molecular cloud about 5' in size with two bright clumps, labeled A and B, clump A positionally associated with the location of HESS J1818-154 and clump B in coincidence with the brightest northern border of the radio SNR shell. The HI absorption and the 13CO emission study indicates a possible interaction between the molecular material and the remnant. We estimate the masses and densities of the molecular gas as (1.2±0.5)x103M and (1.5±0.4)x103cm–3 for clump A and (3.0±0.7)x103M and (1.1±0.3)x103cm–3 for clump B. Calculations show that the average density of the molecular clump A is sufficient to produce the detected γ-ray flux, thus favoring a hadronic origin for the high-energy emission.

Abstract Copyright:

Journal keyword(s): ISM: individual objects: J1818-154 - ISM: supernova remnants - gamma rays: ISM - radio continuum: ISM

Nomenclature: Figure 1b: [CSD2013] A (Nos A and B).

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 - 2022
1 SNR G349.7+00.2 SNR 17 18 10.160 -37 18 53.80           ~ 175 0
2 HESS J1818-154 gam 18 16.1 -15 12           ~ 12 0
3 [CSD2013] B MoC 18 17 57.0 -15 20 13           ~ 2 0
4 SNR G015.4+00.1 Rad 18 18.0 -15 27           ~ 26 1
5 [WWS2012] G015.43+00.19 cor 18 18 00.5414 -15 25 54.360           ~ 10 0
6 [CSD2013] A MoC 18 18 02.0 -15 25 23           ~ 2 0
7 SNR G020.0-00.2 SNR 18 28 07.000 -11 35 00.00           ~ 58 0
8 SNR G021.8-00.6 SNR 18 32 45 -10 08.0           ~ 119 0

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