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À propos de : The strange case of a sub-DLA with very little HI        

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  • The strange case of a sub-DLA with very little HI
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  • We report a deep search for HI 21cm emission from the $z= 0.00632$ sub-DLA toward PG1216+069 with the Giant Metrewave Radio Telescope. No emission was detected and our $5\sigma$ upper limit on the mass of any associated galaxy is $M_{\rm HI} \lesssim 10^7 ~M_odot$, nearly 3 orders of magnitude less than  $M_{\rm HI}^\star$. The $z \sim 0.006$ absorber is thus the most extreme known deviation from the standard paradigm in which high column density quasar absorption lines arise in the disks of gas-rich galaxies.
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  • aagk051
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  • © ESO, 2005
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