2013ApJ...771L..20K


Query : 2013ApJ...771L..20K

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 LCII< 6.4 x 107 x (ΔV/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 1.3x109 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)x108 K km/s.pc2 and a molecular gas mass of M(H2) > (4.12±0.36)x109 M, for a CO-to-H2 conversion factor of 4.6 M(K.km/s.pc2)–1.

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Journal keyword(s): cosmology: observations - galaxies: evolution - galaxies: formation - infrared: galaxies

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 QSO B0235+1624 BLL 02 38 38.93010450 +16 36 59.2745528   16.46 15.50 15.92   ~ 1531 2
2 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 737 0
3 BOW ACO 370 CC039 GiC 02 39 54.440 -01 33 36.03   20.13       ~ 12 1
4 NAME HCM 6A EmG 02 39 54.737 -01 33 32.24           ~ 49 0
5 QSO B0336-0156 QSO 03 39 30.93778633 -01 46 35.8041892   18.96 18.41 17.33   ~ 556 1
6 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 793 0
7 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2827 2

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