3 to 12 millimetre studies of dense gas towards the western rim of supernova remnant RX J1713.7-3946

Maxted, Nigel I., Rowell, Gavin P., Dawson, Bruce R., Burton, Michael G., Nicholas, Brent P., Fukui, Yasuo, Walsh, Andrew J., Kawamura, Akiko, Horachi, Hirotaka, and Sano, Hidetoshi (2012) 3 to 12 millimetre studies of dense gas towards the western rim of supernova remnant RX J1713.7-3946. Monthly Notices of the Royal Astronomical Society, 422 (3). pp. 2230-2245.

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The young X-ray and gamma-ray-bright supernova remnant RX J1713.7-3946 (SNR G347.3-0.5) is believed to be associated with molecular cores that lie within regions of the most intense TeV emission. Using the Mopra telescope, four of the densest cores were observed using high critical density tracers such as CS(J= 10, J= 21) and its isotopologue counterparts, NH₃(1, 1) and (2, 2) inversion transitions and N₂H⁺(J= 10) emission, confirming the presence of dense gas ≥10⁴cm⁻³ in the region. The mass estimates for Core C range from 40 (from CS) to 80 M⊙ (from NH₃ and N₂H⁺), an order of magnitude smaller than published mass estimates from CO(J= 1-0) observations. We also modelled the energy-dependent diffusion of cosmic ray protons accelerated by RX J1713.7-3946 into Core C, approximating the core with average density and magnetic field values. We find that for considerably suppressed diffusion coefficients (factors χ= 10⁻³ down to 10⁻⁵ the Galactic average), low-energy cosmic rays can be prevented from entering the inner core region. Such an effect could lead to characteristic spectral behaviour in the GeV to TeV gamma-ray and multi-keV X-ray fluxes across the core. These features may be measurable with future gamma-ray and multi-keV telescopes offering arcminute or better angular resolution, and can be a novel way to understand the level of cosmic ray acceleration in RX J1713.7-3946 and the transport properties of cosmic rays in the dense molecular cores.

Item ID: 22644
Item Type: Article (Research - C1)
ISSN: 1365-2966
Keywords: diffusion, molecular data, supernovae individual, RX J1713-7-3946, ISM, clouds, cosmic rays, gamma-rays
Funders: Australian Research Council (ARC)
Projects and Grants: DP0662810
Date Deposited: 01 Aug 2012 09:21
FoR Codes: 02 PHYSICAL SCIENCES > 0201 Astronomical and Space Sciences > 020104 Galactic Astronomy @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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