%0 Generic %1 ota2014observation %A Ota, Kazuaki %A Walter, Fabian %A Ohta, Kouji %A Hatsukade, Bunyo %A Carilli, Chris L. %A da Cunha, Elisabete %A González-López, Jorge %A Decarli, Roberto %A Hodge, Jacqueline A. %A Nagai, Hiroshi %A Egami, Eiichi %A Jiang, Linhua %A Iye, Masanori %A Kashikawa, Nobunari %A Riechers, Dominik A. %A Bertoldi, Frank %A Cox, Pierre %A Neri, Roberto %A Weiss, Axel %D 2014 %K alma cii dust high-z limit %T ALMA Observation of 158 micron CII Line and Dust Continuum of a z=7 Normally Star-forming Galaxy in the Epoch of Reionization %U http://arxiv.org/abs/1405.5387 %X We present ALMA observations of the CII line and far-infrared (FIR) continuum of a normally star-forming galaxy in the reionization epoch, the z=6.96 Ly-alpha emitter (LAE) IOK-1. Probing to sensitivities of sigma_line = 240 micro-Jy/beam (40 km/s channel) and sigma_cont = 21 micro-Jy/beam, we found the galaxy undetected in both CII and continuum. Comparison of UV - FIR spectral energy distribution (SED) of IOK-1, including our ALMA limit, with those of several types of local galaxies (including the effects of the cosmic microwave background, CMB, on the FIR continuum) suggests that IOK-1 is similar to local dwarf/irregular galaxies in SED shape rather than highly dusty/obscured galaxies. Moreover, our 3 sigma FIR continuum limit, corrected for CMB effects, implies intrinsic dust mass M_dust < 6.4 x 10^7 M_sun, FIR luminosity L_FIR < 3.7 x 10^10 L_sun (42.5 - 122.5 micron), total IR luminosity L_IR < 5.7 x 10^10 L_sun (8 - 1000 micron) and dust-obscured star formation rate (SFR) < 10 M_sun/yr, if we assume that IOK-1 has a dust temperature and emissivity index typical of local dwarf galaxies. This SFR is 2.4 times lower than one estimated from the UV continuum, suggesting that < 29% of the star formation is obscured by dust. Meanwhile, our 3 sigma CII flux limit translates into CII luminosity, L_CII < 3.4 x 10^7 L_sun. Locations of IOK-1 and previously observed LAEs on the L_CII vs. SFR and L_CII/L_FIR vs. L_FIR diagrams imply that LAEs in the reionization epoch have significantly lower gas and dust enrichment than AGN-powered systems and starbursts at similar/lower redshifts, as well as local star-forming galaxies.

@misc{ota2014observation, abstract = {We present ALMA observations of the [CII] line and far-infrared (FIR) continuum of a normally star-forming galaxy in the reionization epoch, the z=6.96 Ly-alpha emitter (LAE) IOK-1. Probing to sensitivities of sigma_line = 240 micro-Jy/beam (40 km/s channel) and sigma_cont = 21 micro-Jy/beam, we found the galaxy undetected in both [CII] and continuum. Comparison of UV - FIR spectral energy distribution (SED) of IOK-1, including our ALMA limit, with those of several types of local galaxies (including the effects of the cosmic microwave background, CMB, on the FIR continuum) suggests that IOK-1 is similar to local dwarf/irregular galaxies in SED shape rather than highly dusty/obscured galaxies. Moreover, our 3 sigma FIR continuum limit, corrected for CMB effects, implies intrinsic dust mass M_dust < 6.4 x 10^7 M_sun, FIR luminosity L_FIR < 3.7 x 10^{10} L_sun (42.5 - 122.5 micron), total IR luminosity L_IR < 5.7 x 10^{10} L_sun (8 - 1000 micron) and dust-obscured star formation rate (SFR) < 10 M_sun/yr, if we assume that IOK-1 has a dust temperature and emissivity index typical of local dwarf galaxies. This SFR is 2.4 times lower than one estimated from the UV continuum, suggesting that < 29% of the star formation is obscured by dust. Meanwhile, our 3 sigma [CII] flux limit translates into [CII] luminosity, L_[CII] < 3.4 x 10^7 L_sun. Locations of IOK-1 and previously observed LAEs on the L_[CII] vs. SFR and L_[CII]/L_FIR vs. L_FIR diagrams imply that LAEs in the reionization epoch have significantly lower gas and dust enrichment than AGN-powered systems and starbursts at similar/lower redshifts, as well as local star-forming galaxies.}, added-at = {2014-05-22T09:58:19.000+0200}, author = {Ota, Kazuaki and Walter, Fabian and Ohta, Kouji and Hatsukade, Bunyo and Carilli, Chris L. and da Cunha, Elisabete and González-López, Jorge and Decarli, Roberto and Hodge, Jacqueline A. and Nagai, Hiroshi and Egami, Eiichi and Jiang, Linhua and Iye, Masanori and Kashikawa, Nobunari and Riechers, Dominik A. and Bertoldi, Frank and Cox, Pierre and Neri, Roberto and Weiss, Axel}, biburl = {https://www.bibsonomy.org/bibtex/21beb3adca51fc5dd01e54d9e459f6f98/miki}, description = {[1405.5387] ALMA Observation of 158 micron [CII] Line and Dust Continuum of a z=7 Normally Star-forming Galaxy in the Epoch of Reionization}, interhash = {97995aade3f961d2be15c3adce25fa56}, intrahash = {1beb3adca51fc5dd01e54d9e459f6f98}, keywords = {alma cii dust high-z limit}, note = {cite arxiv:1405.5387Comment: 16 pages, 8 figures, 1 table, submitted to ApJ on 21 May 2014}, timestamp = {2014-05-22T09:58:19.000+0200}, title = {ALMA Observation of 158 micron [CII] Line and Dust Continuum of a z=7 Normally Star-forming Galaxy in the Epoch of Reionization}, url = {http://arxiv.org/abs/1405.5387}, year = 2014 }