2013ApJ...771L..20K -
Astrophys. J., 771, L20 (2013/July-2)
A search for C II 158 µm line emission in HCM 6A, a Lyα emitter at z = 6.56.
KANEKAR N., WAGG J., CHARY R.R. and CARILLI C.L.
Abstract (from CDS):
We report a Plateau de Bure Interferometer search for C II 158 µm emission from HCM 6A, a lensed Lyα emitter (LAE) at z = 6.56. Our non-detections of C II 158 µm line emission and 1.2 mm radio continuum emission yield 3σ limits of L
CII< 6.4 x 10
7 x (Δ
V/100Km/s)
1/2 L
☉ for the C II 158 µm line luminosity and S_1.2 mm_< 0.68 mJy for the 1.2 mm flux density. The local conversion factor between L_ C II_and the star formation rate (SFR) yields an SFR < 4.7 M
☉/yr, ~2 times lower than that inferred from the ultraviolet (UV) continuum, suggesting that the local factor may not be applicable in high-z LAEs. The non-detection of 1.2 mm continuum emission yields a total SFR < 28 M
☉/yr; any obscured star formation is thus within a factor of two of the visible star formation. Our best-fit model to the rest-frame UV/optical spectral energy distribution of HCM 6A yields a stellar mass of 1.3x10
9 M
☉ and an SFR of ~10 M
☉/yr, with negligible dust obscuration. We fortuitously detect CO J = 3-2 emission from a z = 0.375 galaxy in the foreground cluster A370, and obtain a CO line luminosity of L'(CO) > (8.95±0.79)x10
8 K km/s.pc2 and a molecular gas mass of M(H
2) > (4.12±0.36)x10
9 M
☉, for a CO-to-H
2 conversion factor of 4.6 M
☉(K.km/s.pc2)
–1.
Abstract Copyright:
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Journal keyword(s):
cosmology: observations - galaxies: evolution - galaxies: formation - infrared: galaxies
Simbad objects:
7
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