Volume 416, Number 2, March III 2004
|Page(s)||L1 - L4|
|Published online||27 February 2004|
Letter to the Editor
The nature of the Ly-emission region of FDF-4691*
Landessternwarte Heidelberg-Königstuhl, 69117 Heidelberg, Germany
2 Institut d'Astrophysique de Paris, 98bis Bd Arago, 75014 Paris, France
Corresponding author: C. Tapken, firstname.lastname@example.org
Accepted: 17 January 2004
In order to study the origin of the strong Lyα emission of high-redshift starburst galaxies we observed and modeled the rest-frame UV spectrum and the Lyα emission of the galaxy FDF-4691 (rest-frame = 103 Å). The observations show that FDF-4691 is a young starburst galaxy with a (for this redshift) typical metallicity. The broad, double-peaked profile of the Lyα emission line can be explained assuming a highly turbulent emission region in the inner part of the starburst galaxy, and a surrounding extended shell of low-density neutral gas with a normal dust/gas ratio and with Galactic dust properties. The detection of the Lyα emission line is explained by the intrinsic broad Lyα emission and a low HI column density of the neutral shell. A low dust/gas ratio in the neutral shell is not needed to explain the strong Lyα line.
Key words: galaxies: high-redshift / galaxies: starburst / line: formation / galaxies: ISM
© ESO, 2004
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