The Abundance Inhomogeneity in the Northern Rim of the Cygnus Loop

Abstract

We observed the northern rim of the Cygnus Loop with the \textit{Suzaku} observatory in 5 pointings (P21-P25). From the spatially resolved analysis, all the spectra are well fitted by the single component of the non-equilibrium ionization plasma model. From the best-fit parameters, we found that the abundances of the heavy elements are significantly lower than the solar values except those at the outermost edge in P21 and P22. The origin of the depleted metal abundances is still unclear while such deficiencies have been reported from many other rim observations of the Loop. To explain these depletion at the rim regions, we considered the several possibilities. The effects of the resonance-line-scattering and the grain condensation lower the values of the abundances. However, these are not sufficient to account for the abundance depletion observed. We found that the abundances at the outermost edge in P21 and P22 are higher than those at the other regions. From the morphological point of view, it is reasonable to consider that this abundance inhomogeneity is derived from the breakout or the thinness of the cavity wall of the Loop.

15 pages, 7 figures, PASJ, Vol.61, No.3

References in corpus (11)

• Monte-Carlo Simulator and Ancillary Response Generator of Suzaku XRT/XIS System for Spatially Extended Source Analysis
• The XMM-Newton EPIC Background: Production of Background Maps and Event Files
• The Homogeneity of Interstellar Oxygen in the Galactic Disk
• Far Ultraviolet Spectra of a Non-Radiative Shock Wave in the Cygnus Loop
• New lambda6cm observations of the Cygnus Loop
• The Plasma Structure of the Cygnus Loop from the Northeastern Rim to the Southwestern Rim
• Radio emission from the Cygnus Loop and its spectral characteristics
• Chandra Observations of the Northeastern Rim of the Cygnus Loop
• The Plasma Structure of the Southwestern Region of the Cygnus Loop with the XMM-Newton Observatory
• Abundance Inhomogeneity in the Northeastern Rim of the Cygnus Loop Revealed by Suzaku Observatory
• Evidence for Resonance Line Scattering in the Suzaku X-ray Spectrum of the Cygnus Loop

Cited by in corpus (8)

• Possible Charge-Exchange X-Ray Emission in the Cygnus Loop Detected with Suzaku
• Multimessengers from core-collapse supernovae: multidimensionality as a key to bridge theory and observation
• The Cygnus Loop's Distance, Properties, and Environment Driven Morphology
• Is the Cygnus Superbubble a Hypernova Remnant?
• Line-of-sight Shell Structure of the Cygnus Loop
• Multiple accelerated particle populations in the Cygnus Loop with Fermi-LAT
• A Distance Estimate to the Cygnus Loop Based on the Distances to Two Stars Located Within the Remnant
• Global Far-Ultraviolet Properties of the Cygnus Loop