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An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: identifying candidate z∼4.5[CII] emitters

Cooke, E.A.; Smail, Ian; Swinbank, A.M.; Stach, S.M.; An, Fang Xia; Gullberg, B.; Almaini, Omar; Simpson, C.J.; Wardlow, J.L.; Blain, A.W.; Chapman, S.C.; Chen, Chian-Chou; Conselice, Christopher; Coppin, K.E.K.; Farrah, D.; Maltby, D.T.; Michałowski, M.J.; Scott, D.; Simpson, J.M.; Thomson, A.P.; Werf, P. van der

Authors

E.A. Cooke

Ian Smail

A.M. Swinbank

S.M. Stach

Fang Xia An

B. Gullberg

Omar Almaini

C.J. Simpson

J.L. Wardlow

A.W. Blain

S.C. Chapman

Chian-Chou Chen

Christopher Conselice

K.E.K. Coppin

D. Farrah

D.T. Maltby

M.J. Michałowski

D. Scott

J.M. Simpson

A.P. Thomson

P. van der Werf



Abstract

We report the results of a search for serendipitous [C ii] 157.74 μm emitters at z sime 4.4–4.7 using the Atacama Large Millimeter/submillimeter Array (ALMA). The search exploits the AS2UDS continuum survey, which covers ~50 arcmin2 of the sky toward 695 luminous (S 870 gsim 1 mJy) submillimeter galaxies (SMGs), selected from the SCUBA-2 Cosmology Legacy Survey 0.96 deg2 Ultra Deep Survey (UDS) field. We detect 10 candidate line emitters, with an expected false detection rate of 10%. All of these line emitters correspond to 870 μm continuum-detected sources in AS2UDS. The emission lines in two emitters appear to be high-J CO, but the remainder have multi-wavelength properties consistent with [C ii] from z sime 4.5 galaxies. Using our sample, we place a lower limit of $\gt 5\times {10}^{-6}\,{\mathrm{Mpc}}^{-3}$ on the space density of luminous (L IR sime 1013 ${L}_{\odot }$) SMGs at z = 4.40–4.66, suggesting $\geqslant 7$% of SMGs with ${S}_{870\mu {\rm{m}}}\gtrsim 1$ mJy lie at 4 < z < 5. From stacking the high-resolution (~0farcs15 full-width half maximum) ALMA 870 μm imaging, we show that the [C ii] line emission is more extended than the continuum dust emission, with an average effective radius for the [C ii] of ${r}_{{\rm{e}}}={1.7}_{-0.2}^{+0.1}$ kpc, compared to r e = 1.0 ± 0.1 kpc for the continuum (rest-frame 160 μm). By fitting the far-infrared photometry for these galaxies from 100 to 870 μm, we show that SMGs at z ~ 4.5 have a median dust temperature of T d = 55 ± 4 K. This is systematically warmer than 870 μm selected SMGs at z sime 2, which typically have temperatures around 35 K. These z sime 4.5 SMGs display a steeper trend in the luminosity-temperature plane than z ≤ 2 SMGs. We discuss the implications of this result in terms of the selection biases of high-redshift starbursts in far-infrared/submillimeter surveys.

Journal Article Type Article
Publication Date Jul 10, 2018
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 861
Issue 2
APA6 Citation Cooke, E., Smail, I., Swinbank, A., Stach, S., An, F. X., Gullberg, B., …Werf, P. V. D. (2018). An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: identifying candidate z∼4.5[CII] emitters. Astrophysical Journal, 861(2), https://doi.org/10.3847/1538-4357/aac6ba
DOI https://doi.org/10.3847/1538-4357/aac6ba
Keywords galaxies: high-redshift ; submillimeter: galaxies
Publisher URL http://iopscience.iop.org/issue/0004-637X/861/2
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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