Issue |
A&A
Volume 452, Number 3, June IV 2006
|
|
---|---|---|
Page(s) | L23 - L26 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:200600025 | |
Published online | 06 June 2006 |
Letter to the Editor
A Lyman-α blob in the GOODS South field: evidence for cold accretion onto a dark matter halo
1
European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching bei München, Germany e-mail: knilsson@eso.org
2
DARK Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark
3
European Southern Observatory, Alonso de Córdova 3107, Casilla 19001, Vitacura, Santiago 19, Chile
Received:
14
December
2005
Accepted:
29
April
2006
We report on the discovery of a Lyman-α emitting blob in the
Great Observatories Origins Deep Survey (GOODS) South field.
The discovery was made with the VLT, through
narrow-band imaging.
The blob has a total Lyα luminosity of
erg s-1 and a diameter larger than 60 kpc.
The available multi-wavelength data in the GOODS field consists of
13 bands from X-rays (Chandra) to infrared (Spitzer). Unlike
other known Lyα blobs, this blob shows no obvious
continuum counter-parts in any of the broad-bands. In particular,
no optical counter-parts are found in deep HST/ACS imaging. For
previously published blobs, AGN (Active Galactic Nuclei) or “superwind”
models have been found to provide the best
match to the data. We here argue that the most probable origin of the
extended Lyα emission from this blob is cold
accretion onto a dark matter halo.
Key words: cosmology: observations / galaxies: high redshift / galaxies: halos
© ESO, 2006
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