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Ivison, Rob
European Southern Observatory
in Cooperation with on an Cooperation-Score of 37%
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article
SXDF-ALMA 1.5 arcmin<SUP>2</SUP> Deep Survey: A Compact Dusty Star-forming Galaxy at z = 2.5
Abstract
We present the first results from the SXDF-Atacama Large Millimeter/submillimeter Array (ALMA) 1.5 arcmin<SUP>2</SUP> deep survey at 1.1 mm using ALMA. The map reaches a 1σ depth of 55 μJy/beam and covers 12 Hα-selected star-forming galaxies (SFGs) at z = 2.19 or z = 2.53. We have detected continuum emission from three of our Hα-selected sample, including one compact SFG with high stellar surface density, NB2315-07. They are all red in the rest-frame optical and have stellar masses of log (M<SUB>*</SUB>/M<SUB>☉</SUB>) 〉 10.9, whereas the other blue, main-sequence galaxies with {log}({M}<SUB>*</SUB>/{M}<SUB>☉ </SUB>) = 10.0-10.8 are exceedingly faint, 〈290 μJy (2σ upper limit). We also find the 1.1 mm brightest galaxy, NB2315-02, to be associated with a compact (R<SUB>e</SUB> = 0.7 ± 0.1 kpc), dusty star-forming component. Given a high gas fraction ({44}<SUB>-8</SUB><SUP>+20</SUP>% or {37}<SUB>-3</SUB><SUP>+25</SUP>%) and high star formation rate surface density ({126}<SUB>-30</SUB><SUP>+27</SUP>{M}<SUB>☉ </SUB> yr<SUP>-1</SUP> kpc<SUP>-2</SUP>), the concentrated starburst can build up within less than {50}<SUB>-11</SUB><SUP>+12</SUP> Myr a stellar surface density matching that of massive compact galaxies at z ̃ 2, provided at least 19 ± 3% of the total gas is converted into stars in the galaxy center. On the other hand, NB2315-07, which already has such a high stellar surface density core, shows a gas fraction ({23}<SUB>-8</SUB><SUP>+8</SUP>%) and is located in the lower envelope of the star formation main sequence. This compact, less SFG is likely to be in an intermediate phase between compact, dusty star-forming and quiescent galaxies.