A Brief History and Research of the Supernova Remnant Cassiopeia A
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منابع مشابه
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...
متن کاملCarbon 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...
متن کاملObservation of VHE γ-rays from Cassiopeia A with the MAGIC telescope
Aims. We searched for very high energy (VHE) γ-ray emission from the supernova remnant Cassiopeia A Methods. The shell-type supernova remnant Cassiopeia A was observed with the 17 meter MAGIC telescope between July 2006 and January 2007 for a total time of 47 hours. Results. The source was detected above an energy of 250 GeV with a significance of 5.2 σ and a photon flux above 1 TeV of (7.3±0.7...
متن کاملThe Fading of Supernova Remnant Cassiopeia A from 38 MHz to 16 . 5 GHz from 1949 to 1999 with New Observations at 1405 MHz
We report 1405 MHz measurements of the flux density of the ≈ 320 year old supernova remnant Cassiopeia A, relative to the flux density of Cygnus A, made between 1995 and 1999. When compared to measurements made between 1957 and 1976, we find that the rate at which Cassiopeia A has been fading at this and nearby frequencies has changed from ≈ 0.9 % yr in the 1960s to ≈ 0.6 − 0.7 % yr now. Furthe...
متن کاملInfrared 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 ...
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تاریخ انتشار 2010