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Soft X-ray Spectroscopy of the Cygnus Loop Supernova Remnant

a r X i v :0801.4552v 1 [a s t r o -p h ] 29 J a n 2008Soft X-ray Spectroscopy of the Cygnus Loop Supernova Remnant

R.L.McEntaffer and W.Cash

Center for Astrophysics and Space Astronomy,University of Colorado,Boulder,CO 80309randall.mcentaffer@colorado.edu ABSTRACT The Cygnus X-ray Emission Spectroscopic Survey (CyXESS)sounding rocket payload was launched from White Sands Missile Range on 2006November 20and obtained a high resolution spectrum of the Cygnus Loop supernova remnant in the soft X-rays.The novel X-ray spectrograph incorporated a wire-grid collima-tor feeding an array of gratings in the extreme off-plane mount which ultimately dispersed the spectrum onto Gaseous Electron Multiplier (GEM)detectors.This instrument recorded 65seconds of usable data between 43-49.5˚A in two promi-nent features.The first feature near 45˚A is dominated by the He-like triplet of O VII in second order with contributions from Mg X and Si IX -Si XII in first order,while the second feature near 47.5˚A is first order S IX and S X .Fits to the spectra give an equilibrium plasma at log(T )=6.2(kT e =0.14keV)and near cosmic abundances.This is consistent with previous observations,which demonstrated that the soft x-ray emission from the Cygnus Loop is dominated by interactions between the initial blast wave with the walls of a precursor formed cavity surrounding the Cygnus Loop and that this interaction can be described using equilibrium conditions.Subject headings:instrumentation:spectrographs —ISM:individual (Cygnus

Loop)—line:identification —supernova remnants —X-rays:individual (Cygnus Loop)

1.Introduction

Supernovae greatly influence the dynamics within the interstellar mediu
m (ISM).Their ubiquitous nature and the size of their remnants allow them to influence multiple phases of the ISM while influencing the evolution and structure of the galaxy.They are responsible for chemical enrichment of the ISM,play a major role in energy input,and are dominant sources for hot ionized gas,which fills much of the galaxy (McKee &Ostriker 1982).

Supernovae greatly influence the dynamics within the interstellar medium (ISM).Their ubiquitous nature and the size of their remnants allow them to influence multiple phases of the ISM while influencing the evolution and structure of the galaxy.They are responsible for chemical enrichment of the ISM,play a major role in energy input,and are dominant sources for hot ionized gas,which fills much of the galaxy (McKee &Ostriker 1982).

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