Interstellar and Ejecta Dust in the Cas A Supernova Remnant
| dc.contributor.author | Arendt, Richard | |
| dc.contributor.author | Dwek, Eli | |
| dc.contributor.author | Kober, Gladys | |
| dc.contributor.author | Rho, Jeonghee | |
| dc.contributor.author | Hwang, Una | |
| dc.date.accessioned | 2022-06-08T21:18:21Z | |
| dc.date.available | 2022-06-08T21:18:21Z | |
| dc.date.issued | 2014-04-16 | |
| dc.description.abstract | Infrared continuum observations provide a means of investigating the physical composition of the dust in the ejecta and swept up medium of the Cas A supernova remnant (SNR). Using low-resolution Spitzer IRS spectra (5–35 μm), and broad-band Herschel PACS imaging (70, 100, and 160 μm), we identify characteristic dust spectra, associated with ejecta layers that underwent distinct nuclear burning histories. The most luminous spectrum exhibits strong emission features at ∼9 and 21 μm and is closely associated with ejecta knots with strong Ar emission lines. The dust features can be reproduced by magnesium silicate grains with relatively low Mg to Si ratios. Another dust spectrum is associated with ejecta having strong Ne emission lines. It has no indication of any silicate features and is best fit by Al2O3 dust. A third characteristic dust spectrum shows features that are best matched by magnesium silicates with a relatively high Mg to Si ratio. This dust is primarily associated with the X-ray-emitting shocked ejecta, but it is also evident in regions where shocked interstellar or circumstellar material is expected. However, the identification of dust composition is not unique, and each spectrum includes an additional featureless dust component of unknown composition. Colder dust of indeterminate composition is associated with emission from the interior of the SNR, where the reverse shock has not yet swept up and heated the ejecta. Most of the dust mass in Cas A is associated with this unidentified cold component, which is ≲ 0.1 M☉. The mass of warmer dust is only ∼0.04 M☉. | en_US |
| dc.description.sponsorship | This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Support for this work was provided by NASA Program NNH09ZDA001N-ADP-0032. This research made use of Tiny Tim/Spitzer, developed by John Krist for the Spitzer Science Center. The Center is managed by the California Institute of Technology under a contract with NASA. This research has made use of NASA's Astrophysics Data System Bibliographic Services. We thank T. Kozasa for providing digitized (and extrapolated and interpolated) versions of the optical constants for several dust species as noted in Table 3. We also thank the referee for constructive comments on the manuscript. | en_US |
| dc.description.uri | https://iopscience.iop.org/article/10.1088/0004-637X/786/1/55 | en_US |
| dc.format.extent | 22 pages | en_US |
| dc.genre | journal articles | en_US |
| dc.identifier | doi:10.13016/m2tdwp-veft | |
| dc.identifier.citation | Richard G. Arendt et al. Interstellar and Ejecta Dust in the Cas A Supernova Remnant. The Astrophysical Journal. 786, 55 (2014). https://doi.org/10.1088/0004-637X/786/1/55 | en_US |
| dc.identifier.uri | https://doi.org/10.1088/0004-637X/786/1/55 | |
| dc.identifier.uri | http://hdl.handle.net/11603/24867 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | IOP Science | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Center for Space Sciences and Technology | |
| dc.relation.ispartof | UMBC Faculty Collection | |
| dc.rights | This is a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law. | en_US |
| dc.rights | Public Domain Mark 1.0 | * |
| dc.rights.uri | http://creativecommons.org/publicdomain/mark/1.0/ | * |
| dc.title | Interstellar and Ejecta Dust in the Cas A Supernova Remnant | en_US |
| dc.type | Text | en_US |
| dcterms.creator | https://orcid.org/0000-0001-8403-8548 | en_US |