grb absorption spectroscopy - Inaf
grb absorption spectroscopy - Inaf
grb absorption spectroscopy - Inaf
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GRB080319B - FINE STRUCTURE LINE VARIABILITY<br />
Fine structure lines nearly<br />
disappear<br />
in less than 2 hours<br />
(less than 1h rest frame at<br />
z=0.937)!<br />
Fe II*<br />
2396<br />
Ground state lines remain<br />
constant (slight increment<br />
compatible with the<br />
decreasing of the excited<br />
levels)<br />
The strongest fine structure line variation<br />
ever found<br />
(optical depth reduced by a factor of 4 – 20)<br />
Fe II<br />
2374
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