Query : 2013A&A...551A.132K

2013A&A...551A.132K - Astronomy and Astrophysics, volume 551A, 132-132 (2013/3-1)

Nonthermal emission properties of the northwestern rim of supernova remnant RX J0852.0-4622.


Abstract (from CDS):

The supernova remnant (SNR) RX J0852.0-4622 (Vela Jr., G266.6-1.2) is one of the most important SNRs for investigating the acceleration of multi-TeV particles and the origin of Galactic cosmic rays because of its strong synchrotron X-ray and TeV γ-ray emission, which show a shell-like morphology similar to each other. Using the XMM-Newton archival data consisting of multiple pointing observations of the northwestern rim of the remnant, we investigate the spatial properties of the nonthermal X-ray emission as a function of distance from an outer shock wave. All X-ray spectra are well reproduced by an absorbed power-law model above 2keV. It is found that the spectra show gradual softening from a photon index Γ=2.56 in the rim region to Γ=2.96 in the interior region. We show that this radial profile can be interpreted as a gradual decrease of the cutoff energy of the electron spectrum due to synchrotron cooling. By using a simple spectral evolution model that includes continuous synchrotron losses, the spectral softening can be reproduced with the magnetic field strength in the post-shock flow to less than several tens of µG. If this is a typical magnetic field in the SNR shell, γ-ray emission would be accounted for by inverse Compton scattering of high-energy electrons that also produce the synchrotron X-ray emission. Future hard X-ray imaging observations with Nustar and ASTRO-H and TeV γ-ray observations with the Cherenkov Telescope Array (CTA) will allow us to explore other possible explanations of the systematic softening of the X-ray spectra.

Abstract Copyright:

Journal keyword(s): radiation mechanisms: non-thermal - ISM: supernova remnants - X-rays: ISM

CDS comments: G226.2-1.2 is a misprint for G266.2-1.2 (SNR G266.2-01.2).

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 NAME Vela XYZ Rad 08 34.0 -45 50           ~ 1143 2
2 NAME Vela Jr SN SNR 08 52.0 -46 20           ~ 425 2
3 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1237 1
4 SNR G347.3-00.5 SNR 17 12 27 -39 41.2     12.27     ~ 642 1

    Equat.    Gal    SGal    Ecl

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