TY - JOUR
T1 - Enhanced [CII] emission in a z = 4.76 submillimetre galaxy
AU - De Breuck, C.
AU - Maiolino, R.
AU - Caselli, P.
AU - Coppin, Kristen
AU - Hailey-Dunsheath, S.
AU - Nagao, T.
N1 - Copyright ESO
PY - 2011/6
Y1 - 2011/6
N2 - We present the detection of bright [CII] emission in the z = 4.76 submillimetre galaxy LESS J033229.4-275619 using the Atacama Pathfinder EXperiment. This represents the highest redshift [CII] detection in a submm selected, star-formation dominated system. The AGN contributions to the [CII] and far-infrared (FIR) luminosities are small. We find an atomic mass derived from [CII] comparable to the molecular mass derived from CO. The ratio of the [CII], CO and FIR luminosities imply a radiation field strength G ∼ 10 and a density ∼ 10 cm in a kpc-scale starburst, as seen in local and high redshift starbursts. The high L/L = 2.4 × 10 and the very high L/L 10 are reminiscent of low metallicity dwarf galaxies, suggesting that the highest redshift star-forming galaxies may also be characterised by lower metallicities. We discuss the implications of a reduced metallicity on studies of the gas reservoirs, and conclude that especially at very high redshift, [CII] may be a more powerful and reliable tracer of the interstellar matter than CO.
AB - We present the detection of bright [CII] emission in the z = 4.76 submillimetre galaxy LESS J033229.4-275619 using the Atacama Pathfinder EXperiment. This represents the highest redshift [CII] detection in a submm selected, star-formation dominated system. The AGN contributions to the [CII] and far-infrared (FIR) luminosities are small. We find an atomic mass derived from [CII] comparable to the molecular mass derived from CO. The ratio of the [CII], CO and FIR luminosities imply a radiation field strength G ∼ 10 and a density ∼ 10 cm in a kpc-scale starburst, as seen in local and high redshift starbursts. The high L/L = 2.4 × 10 and the very high L/L 10 are reminiscent of low metallicity dwarf galaxies, suggesting that the highest redshift star-forming galaxies may also be characterised by lower metallicities. We discuss the implications of a reduced metallicity on studies of the gas reservoirs, and conclude that especially at very high redshift, [CII] may be a more powerful and reliable tracer of the interstellar matter than CO.
UR - http://www.scopus.com/inward/record.url?scp=79956135609&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/201116868
DO - 10.1051/0004-6361/201116868
M3 - Article
AN - SCOPUS:79956135609
SN - 0004-6361
VL - 530
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - L8
ER -