Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812716t&link_type=abstract
American Astronomical Society, AAS Meeting #218, #127.16; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The nature and quantity of dust produced in supernovae (SNe) is still not understood. Recent infrared (IR) observations of freshly-formed dust in supernova remnants (SNRs) have yielded significantly lower dust masses than predicted by theoretical models and high redshift observations. The Crab Nebula's pulsar wind is thought to be sweeping up freshly-formed SN dust along with the SN ejecta. The evidence for this dust was found in the form of an IR bump in the integrated spectrum of the Crab and in extinction against the synchrotron nebula that revealed the presence of dust in the filament cores. We present the first spatially resolved emission spectra of dust in the Crab Nebula acquired with the Spitzer Space Telescope. The IR spectra are dominated by synchrotron emission and show forbidden line emission from both sides of the expanding nebula, including emission from S, Si, Ne, Ar, Fe, and Ni. We extrapolated a synchrotron spectral cube from the Spitzer 3.6 and 4.5 micron images, and subtracted this contribution from our spectral data to produce a map of the residual continuum emission from dust. The emission appears to be concentrated along the ejecta filaments and is well fitted by astronomical silicates at an average temperature of 52 K. We discuss the spatial variations in the dust spectrum across the nebula and revise the total dust mass estimates.
Arendt Richard G.
Dwek Eli
Gehrz Robert D.
Slane Patrick O.
Sonneborn George
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