Multiphase ISM in the z = 5.7 Hyperluminous Starburst SPT 034652 uri icon

abstract

  • Abstract With SFR 4200 M yr1 kpc2, SPT 034652 (z = 5.7) is the most intensely star-forming galaxy discovered by the South Pole Telescope. In this paper, we expand on previous spatially resolved studies, using ALMA observations of dust continuum, [N ii] 205 m, [C ii] 158 m, [O i] 146 m, and undetected [N ii] 122 m and [O i] 63 m emission to study the multiphase interstellar medium (ISM) in SPT 034652. We use pixelated, visibility-based lens modeling to reconstruct the source-plane emission. We also model the source-plane emission using the photoionization code cloudy and find a supersolar metallicity system. We calculate T dust = 48.3 K and peak = 80 m and see line deficits in all five lines. The ionized gas is less dense than comparable galaxies, with n e < 32 cm3, while 20% of the [C ii] 158 m emission originates from the ionized phase of the ISM. We also calculate the masses of several phases of the ISM. We find that molecular gas dominates the mass of the ISM in SPT 034652, with the molecular gas mass 4 higher than the neutral atomic gas mass and 100 higher than the ionized gas mass.

published proceedings

  • The Astrophysical Journal

author list (cited authors)

  • Litke, K. C., Marrone, D. P., Aravena, M., Bthermin, M., Chapman, S. C., Dong, C., ... Wei, A.

complete list of authors

  • Litke, Katrina C||Marrone, Daniel P||Aravena, Manuel||Béthermin, Matthieu||Chapman, Scott C||Dong, Chenxing||Hayward, Christopher C||Hill, Ryley||Jarugula, Sreevani||Malkan, Matthew A||Narayanan, Desika||Reuter, Cassie A||Spilker, Justin S||Sulzenauer, Nikolaus||Vieira, Joaquin D||Weiß, Axel

publication date

  • April 2022