We report the discovery and constrain the physical conditions of the interstellar medium of the highest-redshift millimeter-selected dusty star-forming galaxy (DSFG) to date, SPT-S J031132−5823.4 (hereafter SPT0311−58), at z = 6.900 ± 0.002. SPT0311−58 was discovered via its 1.4 mm thermal dust continuum emission in the South Pole Telescope (SPT)-SZ survey. The spectroscopic redshift was determined through an ALMA 3 mm frequency scan that detected CO(6–5), CO(7–6) and [C I](2–1), and subsequently confirmed by detections of CO(3–2) with ATCA and [C II] with APEX. We constrain the properties of the ISM in SPT0311−58 with a radiative transfer analysis of the dust continuum photometry and the CO and [C I] line emission. This allows us to determine the gas content without ad hoc assumptions about gas mass scaling factors. SPT0311−58 is extremely massive, with an intrinsic gas mass of Mgas = 3.3 ± 1.9 × 1011 M4544. Its large mass and intense star formation is very rare for a source well into the Epoch of Reionization.
|Original language||English (US)|
|State||Published - May 22 2017|
- 1. INTRODUCTION
- High-redshift — galaxies
- Star formation — early universe
ASJC Scopus subject areas