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SEARCH FOR [C II] EMISSION IN z = 6.5-11 STAR-FORMING GALAXIES

2014; IOP Publishing; Volume: 784; Issue: 2 Linguagem: Inglês

10.1088/0004-637x/784/2/99

1538-4357

Jorge González-López, Dominik A. Riechers, Roberto Decarli, Fabian Walter, L. Vallini, R. Neri, F. Bertoldi, Alberto D. Bolatto, Christopher L. Carilli, P. Cox, Elisabete da Cunha, Andrea Ferrara, S. Gallerani, L. Infante,

Astrophysics and Star Formation Studies

We present the search for the [C ii] emission line in three z > 6.5 Lyα emitters (LAEs) and one J-dropout galaxy using the Combined Array for Research in Millimeter-wave Astronomy and the Plateau de Bure Interferometer. We observed three bright z ∼ 6.5–7 LAEs discovered in the Subaru Deep Field (SDF) and the multiple imaged lensed z ∼ 11 galaxy candidate found behind the galaxy cluster MACSJ0647.7+7015. For the LAEs IOK-1 (z = 6.965), SDF J132415.7+273058 (z = 6.541), and SDF J132408.3+271543 (z = 6.554) we find upper limits for the [C ii] line luminosity of <2.05, <4.52, and <10.56 × 108 L☉, respectively. We find upper limits to the far-IR (FIR) luminosity of the galaxies using a spectral energy distribution template of the local galaxy NGC 6946 and taking into account the effects of the cosmic microwave background on the millimeter observations. For IOK-1, SDF J132415.7+273058, and SDF J132408.3+271543 we find upper limits for the FIR luminosity of <2.33, 3.79, and 7.72 × 1011 L☉, respectively. For the lensed galaxy MACS0647-JD, one of the highest-redshift galaxy candidates to date with , we put an upper limit in the [C ii] emission of <1.36 × 108 × (μ/15)−1 L☉ and an upper limit in the FIR luminosity of <6.1 × 1010 × (μ/15)−1 L☉ (where μ is the magnification factor). We explore the different conditions relevant for the search for [C ii] emission in high-redshift galaxies as well as the difficulties for future observations with the Atacama Large Millimeter/submillimeter Array (ALMA) and the Cerro Chajnantor Atacama Telescope (CCAT).