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High-Resolution X-ray Spectroscopy Observations of Supernova Remnants

hamal avatar
hamal
23 diapositives · 354 Views · Sep 09, 2014

This presentation provides an overview of Supernova Remnants (SNRs) science, focusing on observations made with the High Energy Transmission Grating (HETG) on X-ray telescopes. It explores key SNRs such as E0102, Cas A, and SN 1987A, detailing their progenitor stars, explosion mechanisms, and nucleosynthesis. The talk emphasizes the importance of X-ray spectroscopy in understanding the dynamics of SNRs, their interaction with the interstellar medium, and their contributions to cosmic evolution. Future directions for research and advancements in observational techniques are also discussed.

#high-resolution x-ray spectroscopy observations of supernova remnants #high-resolution x-ray spectroscopy observations of supernova remnants ppt #powerpoint #presentation
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  1. Young, thin, & on the m o v e : HETG Observations of SNRs Dan Dewey MIT Kavli Institute X-ray Spectroscopy - 2007

  2. Overview • SNR Science • SNRs with Gratings • Three SNR-HETG examples: • E0102, Cas A, SN1987A • For the Future X-ray Spectroscopy - 2007

  3. SNR Science • Progenitor and CSM • SN Explosion - Core collapse & Type Ia • Mechanism, asymmetry, jets, mixing • Compact object formation • Nucleosynthesis • GRB connection • ISM enrichment: dust, hot plasma, CRs X-ray Spectroscopy - 2007

  4. For fun… SNRs and AGN • Size - similar: • few parsecs scale • Mass: • SNR: 10's Msolar • torus: ~ 105 Msolar • LX-ray [log10(erg/s)] • SNR ~ 37.5, AGN ~ 42.1 X-ray Spectroscopy - 2007

  5. v ~ const * r SNR cartoon Reverse Shock • Sedov self- similar solution • Reality adds: • R-T/mixing at CD • Non-uniform CSM • Asymmetric ejecta • Particle acceleration ContactDiscontinuity Unshocked ejecta(aka "debris") shocked ejecta CSM,amb shocked CSM Forward Shock X-ray Spectroscopy - 2007

  6. SNR Plasma • Collision-less shocks: FS, RS, reflected • V forward shock: 3k - 40k km/s • Vejecta@RS ~ rRS/ageSN1987A=7800; CasA=4800; E0102=2800 [km/s] • NEI evolution, cooling • Electron & ion heating at shocks X-ray Spectroscopy - 2007

  7. SNR Plasma, cont. • Shock-cloud interactions • Non-uniform CSM • Thermal conduction effects • Particle acceleration & Cosmic rays • Efficiency and effect on hydrodynamics X-ray Spectroscopy - 2007

  8. SNR Plasma Emission • Emission across wide -range • Thermal • shocked ejecta; shocked CSM; dust • Non-thermal • Synchrotron, Te max, magnetic fields • non-thermal brems., inverse Compton • Photoionized (unshocked, precursor) X-ray Spectroscopy - 2007

  9. SNRs with Gratings • High(er) spectral resolution than CCDs • Line separation • From nearby lines: He-like triplets • From continuum: low-E lines: O VIII, Fe-L, Ne • Doppler velocities can be measured • Extended and/or multiple source • More complex analysis • Focus on line emission X-ray Spectroscopy - 2007

  10. SNRs observed w/HETG * Values are for the bright X-ray emitting plasma. X-ray Spectroscopy - 2007

  11. SNRs w/HETG: images E0102 N132D Cas A SN1987A N103B 0509-67.5 Crab X-ray Spectroscopy - 2007

  12. Ne X Fe XVII Dispersed SNRs O VIII O VII-res 1 Å 26 Å '87A E0102 N132D-NE N132D-SW Cas A Si XIII N103B 0509 Crab Not as useful for continuum X-ray Spectroscopy - 2007

  13. E0102 w/HETG MEG -1 MEG +1 Data Model Distortions between the + and - orders of the Ne lines are qualitatively reproduced with a cylinderical geometry for the ring emission. Dewey 2002; Flanagan et al. 2004. Model geometry X-ray Spectroscopy - 2007

  14. Cas A w/HETG • Doppler velocities • 3D spatial info Lazendic et al. 2006 • Combine with optical,IR, and radio data.DeLaney 2007 X-ray Spectroscopy - 2007

  15. Cas A w/HETG, cont. • Line ratios • NEI parameters  params / t : kT Change in plasma parameters over many years baseline can constrain models.  t X-ray Spectroscopy - 2007

  16. SN 1987A w/HETG • The blast wave is hitting a dense equatorial ring, tilted 45 degrees to our line of sight X-ray Spectroscopy - 2007

  17. X-ray Spectroscopy - 2007

  18. SN 1987A w/HETG, cont. A 3D model is used to fit the HETG line shapes; a key free parameter is Vring . X-ray Spectroscopy - 2007

  19. SN 1987A w/HETG, cont. • Vring varies with . • Seen in LETG/ACISdata (McCray PI.) • Zhekov et al. 2005 • Range of shock (andhence bulk) velocities. • Higher ionization withfaster velocities. X-ray Spectroscopy - 2007

  20. For the future • Can get information from HETG-SNRobservations, so … • Further HETG observations… • O-rich SNR • Future X-ray instruments for SNR • Long slit spectrometer X-ray Spectroscopy - 2007

  21. Oxygen-rich SNRs In SMC/LMC: • SN 1987A (LMC) ?O-rich? • N132D (LMC) • SNR 0540-69.3 (LMC) • E0102.2-7219 (SMC) • SNR 0103-72.6 (SMC) • IKT6, SNR 0049-73.6 (SMC) • Galactic & extra-Galactic: • Cas A • Pup A • G292+1.8 • SNR in NGC 4449 • SN 1957D in M83 • Underline = Grating observed • Bold = Deep ACIS data taken X-ray Spectroscopy - 2007

  22. Multi- & High Resolution Long-slit instrumentsfrom IR to … X-ray ? Primary Slitaperture Willingale 2005 SPIE Vol. 5900 2D detector X-ray Spectroscopy - 2007

  23. Thanks to Claude Canizares and MKI collegues Hydra project:http://space.mit.edu/hydra Dick McCray and '87A collaborators See the program of the Aspen '87A workshop:http://astrophysics.gsfc.nasa.gov/conferences/supernova1987a/ Kelly Korreck and many SNR enthusiasts See the Endpoints and Interactions workshop:http://www.cfa.harvard.edu/~kkorreck/snrconf.htm X-ray Spectroscopy - 2007