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Letter to the editor (Scientific journals)
Interstellar calcium towards supernova 1987A in the Large Magellanic Cloud
Magain, Pierre
1987In Nature, 329, p. 606
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Keywords :
ASTRONOMICAL SPECTROSCOPY; CALCIUM; INTERSTELLAR MATTER; MAGELLANIC CLOUDS; SUPERNOVA 1987A; HIGH RESOLUTION; IONIZATION POTENTIALS; SIGNAL TO NOISE RATIOS
Abstract :
[en] High-resolution and high SNR spectra of interstellar calcium towards SN1987A in the LMC are presented. They provide completely new results for the Ca I spectrum, in which 11 components are detected, not only at velocities corresponding to the Galaxy and the LMC, but also at intermediate velocities. The spectra, which allow the ionization balance in these interstellar clouds to be estimated, provide some clues about their physical state and location. In particular, the components between 150 and 200 km/s show a much lower ionization degree than other components. This may be due to recent compressions of the gas by a shock, possibly associated with a former supernova explosion. This interpretation would require the corresponding clouds to be located inside the LMC, indicating that at least some intermediate velocity components are not of halo origin.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Magain, Pierre  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Language :
English
Title :
Interstellar calcium towards supernova 1987A in the Large Magellanic Cloud
Publication date :
01 October 1987
Journal title :
Nature
ISSN :
0028-0836
eISSN :
1476-4687
Publisher :
Nature Publishing Group, London, United Kingdom
Volume :
329
Pages :
606
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 04 February 2010

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