Millimeter observations of HCM6A, a gravitationally lensed Lyman alpha emitting galaxy at z=6.56

Abstract

The gravitationally lensed Lyman-alpha emitting galaxy, HCM6A, detected by Hu et al. (2002) at z=6.56 behind the Abell 370 cluster was observed with the MAMBO-2 array of bolometers at 1.2mm wavelength. The galaxy was not detected down to 1.08 mJy (3 sigma), but the depth of the observations and the lens amplification allow us to improve by approximately one order of magnitude previously published upper limits on far infrared emission of Lyman-alpha emitting galaxies at this redshift. The following upper limits are derived from our observations assuming typical dust parameters: dust mass <5.3x10^7 Msun, IR luminosity <2.1x10^{11} Lsun, and star formation rate, SFR<35 Msun/yr. The observed restframe UV--optical--IR spectral energy distribution (SED) of this galaxy is compatible with that of normal spiral galaxies or blue compact dwarf galaxies. SEDs of prototypical ULIRGs, such as Arp 220, are clearly excluded. Finally, we obtain an upper limit of < 2.1x10^{-2} Msun/yr/Mpc^{-3} for the dust-obscured SFR density of Lyman-alpha selected galaxies at z~6.6.

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• ALMA Observation of 158 micron [CII] Line and Dust Continuum of a z=7 Normally Star-forming Galaxy in the Epoch of Reionization
• New constraints on dust emission and UV attenuation of z=6.5-7.5 galaxies from millimeter observations
• A search for CII-158$\mu$m line emission in HCM\,6A, a Lyman-$\alpha$ emitter at $z=6.56$
• The properties of the brightest Lyman alpha emitters at z~5.7
• ALMA Observations of the Host Galaxy of GRB090423 at z=8.23: Deep Limits on Obscured Star Formation 630 Million Years After the Big Bang
• The molecular gas content of z > 6.5 Lyman-alpha emitters
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• Deep 15um AKARI observations in the CDFS: estimating dust luminosities for a MIR-selected sample and for Lyman Break Galaxies and the evolution of L(dust)/L(UV) with the redshift
• Resolving the molecular gas around the lensed quasar RXJ0911.4+0551
• Lyman alpha emitting and related star-forming galaxies at high redshift
• Resolving dust and Lyα emission in a lensed galaxy at the epoch of reionization with JWST/CANUCS