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Dust Formation Observed in Young Supernova Remnants with Spitzer

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Title: Dust Formation Observed in Young Supernova Remnants with Spitzer
Authors: Rho, J. Browse this author
Reach, W. T. Browse this author
Tappe, A. Browse this author
Rudnick, L. Browse this author
Kozasa, T. Browse this author
Hwang, U. Browse this author
Andersen, M. Browse this author
Gomez, H. Browse this author
DeLaney, T. Browse this author
Dunne, L. Browse this author
Slavin, J. Browse this author
Issue Date: Mar-2010
Publisher: Astronomical Society of the Pacific
Citation: Cosmic Dust - Near and Far. Eds. by Thomas Henning, Eberhard Grün, and Jürgen Steinacker. ISBN: 978-1-58381-708-7
Journal Title: Astronomical Society of the Pacific conference series
Volume: 414
Start Page: 22
Abstract: We present dust features and masses observed in young supernova remnants (SNRs) with Spitzer Infrared Spectrograph (IRS) mapping and staring observations of four youngest supernova remnants: SNR 1E102.2-7219 (E0102) in the Small Magellanic Cloud (SMC), Cas A and G11.2-0.3 in our Galaxy, and N132D in the Large Magellanic Cloud (LMC). The spectral mapping data revealed a number of dust features which include 21 micron-peak dust and featureless dust in Cas A and 18-micron peak dust in E0102 and N132D. The 18 micron-peak feature is fitted by a mix of MgSiO3 and solid Si dust grains, while the 21-micron peak dust is by a mix of silicates and FeO; we also explore dust fitting using Continuous Distribution of Ellipsoid grain models. We report detection of CO fundamental band from Cas A in near-infrared. We review dust features observed and identified in other SNRs. The dust emission is spatially correlated with the ejecta emission, showing dust is formed in SN ejecta. The spectra of E0102 show rich gas lines from ejecta including strong ejecta lines of Ne and O, including two [Ne III] lines and two [Ne V] lines which allow us to diagnostic density and temperature of the ejecta and measure the ejecta masses. E0102 and N132D show weak or lacking Ar, Si, and Fe ejecta, whereas the young Galactic SNR Cas A show strong Ar, Si, and S and weak Fe. We discuss compositions and masses of dust and association with those of ejecta and finally, dust contribution from SNe to early Universe.
Description: Cosmic Dust - Near and Far. 8-12 September 2008. Convention Center, Heidelberg, Germany.
Conference Name: Cosmic Dust : Near and Far
Conference Place: Heidelberg
Type: proceedings (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 小笹 隆司

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