Phosphorus in the young supernova remnant Cassiopeia A.

Carbon Monoxide in the Cassiopeia a Supernova Remnant

We report the likely detection of near-infrared 2.29 μm first overtone carbon monoxide (CO) emission from the young supernova (SN) remnant Cassiopeia A (Cas A). The continuum-subtracted CO filter map reveals CO knots within the ejecta-rich reverse shock. We compare the first overtone CO emission with that found in the well studied supernova SN 1987A and find ∼30 times less CO in Cas A. The pres...

Infrared echoes near the supernova remnant Cassiopeia A.

Two images of Cassiopeia A obtained at 24 micrometers with the Spitzer Space Telescope over a 1-year time interval show moving structures outside the shell of the supernova remnant to a distance of more than 20 arc minutes. Individual features exhibit apparent motions of 10 to 20 arc seconds per year, independently confirmed by near-infrared observations. The observed tangential velocities are ...

The Cassiopeia A supernova was of type IIb.

Cassiopeia A is the youngest supernova remnant known in the Milky Way and a unique laboratory for supernova physics. We present an optical spectrum of the Cassiopeia A supernova near maximum brightness, obtained from observations of a scattered light echo more than three centuries after the direct light of the explosion swept past Earth. The spectrum shows that Cassiopeia A was a type IIb super...

Newly Synthesized Elements and Pristine Dust in the Cassiopeia A Supernova Remnant

Spectroscopic observations at 2.4 – 45 μm of the young supernova remnant Cas A with the Infrared Space Observatory (ISO) Short Wavelength Spectrometer (SWS) reveal strong emission lines of O, Ne, Si, S, and Ar. These lines are observed at high velocities (several 10 km s), and are therefore associated with the supernova ejecta known as the fast-moving knots (FMKs). Continuum emission from dust ...

A Brief History and Research of the Supernova Remnant Cassiopeia A