2012ApJ...747L...6R


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.21CEST05:05:39

2012ApJ...747L...6R - Astrophys. J., 747, L6 (2012/March-1)

Spectroscopic detection of carbon monoxide in the young supernova remnant Cassiopeia A.

RHO J., ONAKA T., CAMI J. and REACH W.T.

Abstract (from CDS):

We report the detection of carbon monoxide (CO) emission from the young supernova remnant Cassiopeia A (Cas A) at wavelengths corresponding to the fundamental vibrational mode at 4.65 µm. We obtained AKARI Infrared Camera spectra toward four positions which unambiguously reveal the broad characteristic CO ro-vibrational band profile. The observed positions include unshocked ejecta at the center, indicating that CO molecules form in the ejecta at an early phase. We extracted a dozen spectra across Cas A along the long 1' slits and compared these to simple CO emission models in local thermodynamic equilibrium to obtain first-order estimates of the excitation temperatures and CO masses involved. Our observations suggest that significant amounts of carbon may have been locked up in CO since the explosion 330 years ago. Surprisingly, CO has not been efficiently destroyed by reactions with ionized He or the energetic electrons created by the decay of the radiative nuclei. Our CO detection thus implies that less carbon is available to form carbonaceous dust in supernovae than is currently thought and that molecular gas could lock up a significant amount of heavy elements in supernova ejecta.

Abstract Copyright:

Journal keyword(s): dust, extinction - ISM: molecules - ISM: supernova remnants - molecular processes

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 SN 2006et SN* 00 42 45.82 -23 33 30.4     16.1     SNIa 54 1
2 SN 1998dl SN* 02 46 01.47 -07 34 25.1     16.0     SNIIP 38 1
3 SN 2005aj SN* 02 58 48.85 +75 45 13.8     18     SNIc 17 1
4 SN 1999em SN* 04 41 27.04 -02 51 45.2   13.79 13.7     SNIIP 603 1
5 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4593 2
6 SN 1995ad SN* 06 01 06.13 -23 40 29.0       15.7   SNII 45 1
7 2MASS J07371703+6535579 HXB 07 37 17.0439241104 +65 35 57.815731387           SNIIP 243 1
8 SN 1999gi SN* 10 18 16.66 +41 26 28.2   14.8       SNIIP 213 1
9 SN 2000ew SN* 11 40 58.52 +11 27 55.9     14.9     SNIc 52 1
10 SN 1998S SN* 11 46 06.13 +47 28 55.4     12.2     SNIIn 398 1
11 NAME Cas A SNR 23 23 24.000 +58 48 54.00     14.30     ~ 2507 1

    Equat.    Gal    SGal    Ecl

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2021.06.21-05:05:39

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