THE THREE-DIMENSIONAL STRUCTURE OF INTERIOR EJECTA IN CASSIOPEIA A AT HIGH SPECTRAL RESOLUTION
We used the Spitzer Space Telescope's Infrared Spectrograph to create a high-resolution spectral map of the central region of the Cassiopeia A (Cas A) supernova remnant, allowing us to make a Doppler reconstruction of its three-dimensional structure. The ejecta responsible for this emission hav...
| Main Authors: | , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
Institute of Physics/American Astronomical Society
2015
|
| Online Access: | http://hdl.handle.net/1721.1/95876 https://orcid.org/0000-0002-0338-296X |
| _version_ | 1826208001093009408 |
|---|---|
| author | Isensee, Karl Rudnick, Lawrence DeLaney, Tracey Smith, J. D. Rho, Jeonghee Reach, William T. Kozasa, Takashi Gomez, Haley |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Isensee, Karl Rudnick, Lawrence DeLaney, Tracey Smith, J. D. Rho, Jeonghee Reach, William T. Kozasa, Takashi Gomez, Haley |
| author_sort | Isensee, Karl |
| collection | MIT |
| description | We used the Spitzer Space Telescope's Infrared Spectrograph to create a high-resolution spectral map of the central region of the Cassiopeia A (Cas A) supernova remnant, allowing us to make a Doppler reconstruction of its three-dimensional structure. The ejecta responsible for this emission have not yet encountered the remnant's reverse shock or the circumstellar medium, making it an ideal laboratory for exploring the dynamics of the supernova explosion itself. We observe that the O, Si, and S ejecta can form both sheet-like structures and filaments. Si and O, which come from different nucleosynthetic layers of the star, are observed to be coincident in velocity space in some regions, and separated by 500 km s–1 or more in others. Ejecta traveling toward us are, on average, ~900 km s–1 slower than the material traveling away from us. We compare our observations to recent supernova explosion models and find that no single model can simultaneously reproduce all the observed features. However, models of different supernova explosions can collectively produce the observed geometries and structures of the interior emission. We use the results from the models to address the conditions during the supernova explosion, concentrating on asymmetries in the shock structure. We also predict that the back surface of Cas A will begin brightening in ~30 years, and the front surface in ~100 years. |
| first_indexed | 2024-09-23T13:58:45Z |
| format | Article |
| id | mit-1721.1/95876 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:58:45Z |
| publishDate | 2015 |
| publisher | Institute of Physics/American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/958762022-09-28T17:27:57Z THE THREE-DIMENSIONAL STRUCTURE OF INTERIOR EJECTA IN CASSIOPEIA A AT HIGH SPECTRAL RESOLUTION Isensee, Karl Rudnick, Lawrence DeLaney, Tracey Smith, J. D. Rho, Jeonghee Reach, William T. Kozasa, Takashi Gomez, Haley MIT Kavli Institute for Astrophysics and Space Research DeLaney, Tracey We used the Spitzer Space Telescope's Infrared Spectrograph to create a high-resolution spectral map of the central region of the Cassiopeia A (Cas A) supernova remnant, allowing us to make a Doppler reconstruction of its three-dimensional structure. The ejecta responsible for this emission have not yet encountered the remnant's reverse shock or the circumstellar medium, making it an ideal laboratory for exploring the dynamics of the supernova explosion itself. We observe that the O, Si, and S ejecta can form both sheet-like structures and filaments. Si and O, which come from different nucleosynthetic layers of the star, are observed to be coincident in velocity space in some regions, and separated by 500 km s–1 or more in others. Ejecta traveling toward us are, on average, ~900 km s–1 slower than the material traveling away from us. We compare our observations to recent supernova explosion models and find that no single model can simultaneously reproduce all the observed features. However, models of different supernova explosions can collectively produce the observed geometries and structures of the interior emission. We use the results from the models to address the conditions during the supernova explosion, concentrating on asymmetries in the shock structure. We also predict that the back surface of Cas A will begin brightening in ~30 years, and the front surface in ~100 years. United States. National Aeronautics and Space Administration (NASA/SAO Award AR5–6008X)) United States. National Aeronautics and Space Administration (NASA/JPL award 1265552 ) 2015-03-05T16:38:24Z 2015-03-05T16:38:24Z 2010-12 2009-08 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/95876 Isensee, Karl, Lawrence Rudnick, Tracey DeLaney, J. D. Smith, Jeonghee Rho, William T. Reach, Takashi Kozasa, and Haley Gomez. “THE THREE-DIMENSIONAL STRUCTURE OF INTERIOR EJECTA IN CASSIOPEIA A AT HIGH SPECTRAL RESOLUTION.” The Astrophysical Journal 725, no. 2 (December 3, 2010): 2059–2070. © 2010 American Astronomical Society. https://orcid.org/0000-0002-0338-296X en_US http://dx.doi.org/10.1088/0004-637x/725/2/2059 Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Institute of Physics/American Astronomical Society American Astronomical Society |
| spellingShingle | Isensee, Karl Rudnick, Lawrence DeLaney, Tracey Smith, J. D. Rho, Jeonghee Reach, William T. Kozasa, Takashi Gomez, Haley THE THREE-DIMENSIONAL STRUCTURE OF INTERIOR EJECTA IN CASSIOPEIA A AT HIGH SPECTRAL RESOLUTION |
| title | THE THREE-DIMENSIONAL STRUCTURE OF INTERIOR EJECTA IN CASSIOPEIA A AT HIGH SPECTRAL RESOLUTION |
| title_full | THE THREE-DIMENSIONAL STRUCTURE OF INTERIOR EJECTA IN CASSIOPEIA A AT HIGH SPECTRAL RESOLUTION |
| title_fullStr | THE THREE-DIMENSIONAL STRUCTURE OF INTERIOR EJECTA IN CASSIOPEIA A AT HIGH SPECTRAL RESOLUTION |
| title_full_unstemmed | THE THREE-DIMENSIONAL STRUCTURE OF INTERIOR EJECTA IN CASSIOPEIA A AT HIGH SPECTRAL RESOLUTION |
| title_short | THE THREE-DIMENSIONAL STRUCTURE OF INTERIOR EJECTA IN CASSIOPEIA A AT HIGH SPECTRAL RESOLUTION |
| title_sort | three dimensional structure of interior ejecta in cassiopeia a at high spectral resolution |
| url | http://hdl.handle.net/1721.1/95876 https://orcid.org/0000-0002-0338-296X |
| work_keys_str_mv | AT isenseekarl thethreedimensionalstructureofinteriorejectaincassiopeiaaathighspectralresolution AT rudnicklawrence thethreedimensionalstructureofinteriorejectaincassiopeiaaathighspectralresolution AT delaneytracey thethreedimensionalstructureofinteriorejectaincassiopeiaaathighspectralresolution AT smithjd thethreedimensionalstructureofinteriorejectaincassiopeiaaathighspectralresolution AT rhojeonghee thethreedimensionalstructureofinteriorejectaincassiopeiaaathighspectralresolution AT reachwilliamt thethreedimensionalstructureofinteriorejectaincassiopeiaaathighspectralresolution AT kozasatakashi thethreedimensionalstructureofinteriorejectaincassiopeiaaathighspectralresolution AT gomezhaley thethreedimensionalstructureofinteriorejectaincassiopeiaaathighspectralresolution AT isenseekarl threedimensionalstructureofinteriorejectaincassiopeiaaathighspectralresolution AT rudnicklawrence threedimensionalstructureofinteriorejectaincassiopeiaaathighspectralresolution AT delaneytracey threedimensionalstructureofinteriorejectaincassiopeiaaathighspectralresolution AT smithjd threedimensionalstructureofinteriorejectaincassiopeiaaathighspectralresolution AT rhojeonghee threedimensionalstructureofinteriorejectaincassiopeiaaathighspectralresolution AT reachwilliamt threedimensionalstructureofinteriorejectaincassiopeiaaathighspectralresolution AT kozasatakashi threedimensionalstructureofinteriorejectaincassiopeiaaathighspectralresolution AT gomezhaley threedimensionalstructureofinteriorejectaincassiopeiaaathighspectralresolution |