Details

Autor(en) / Beteiligte

• NILSSON, K. K
• FYNBO, J. P. U
• MØLLER, P
• SOMMER-LARSEN, J
• LEDOUX, C

Titel

A Lyman-α blob in the GOODS south field : evidence for cold accretion onto a dark matter halo

Ist Teil von

• Astronomy and astrophysics (Berlin), 2006-06, Vol.452 (3), p.L23-L26

Ort / Verlag

Les Ulis: EDP Sciences

Erscheinungsjahr

2006

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We report on the discovery of a z = 3.16 Lyman- alpha 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 Ly alpha luminosity of similar to 10 super(43) erg s super(-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 Ly alpha 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 Ly alpha emission from this blob is cold accretion onto a dark matter halo.