Turbulent Gas in Lensed Planck-selected Starbursts at z ∼ 1-3.5

Kevin C. Harrington, Axel Weiss, Min S. Yun, Benjamin Magnelli, C. E. Sharon, T. K.D. Leung, A. Vishwas, Q. D. Wang, D. T. Frayer, E. F. Jiménez-Andrade, D. Liu, P. García, E. Romano-Díaz, B. L. Frye, S. Jarugula, T. Bǎdescu, D. Berman, H. Dannerbauer, A. Díaz-Sánchez, L. GrassitelliP. Kamieneski, W. J. Kim, A. Kirkpatrick, J. D. Lowenthal, H. Messias, J. Puschnig, G. J. Stacey, P. Torne, F. Bertoldi

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Dusty star-forming galaxies at high redshift (1 < z < 3) represent the most intense star-forming regions in the universe. Key aspects to these processes are the gas heating and cooling mechanisms, and although it is well known that these galaxies are gas-rich, little is known about the gas excitation conditions. Only a few detailed radiative transfer studies have been carried out owing to a lack of multiple line detections per galaxy. Here we examine these processes in a sample of 24 strongly lensed star-forming galaxies identified by the Planck satellite (LPs) at z ∼ 1.1-3.5. We analyze 162 CO rotational transitions (ranging from J up = 1 to 12) and 37 atomic carbon fine-structure lines ([C i]) in order to characterize the physical conditions of the gas in the sample of LPs. We simultaneously fit the CO and [C i] lines and the dust continuum emission, using two different non-LTE, radiative transfer models. The first model represents a two-component gas density, while the second assumes a turbulence-driven lognormal gas density distribution. These LPs are among the most gas-rich, IR-luminous galaxies ever observed (μL L IR(8-1000 μm) ∼ 1013-14.6 L⊙; «μLMISM» = (2.7 ± 1.2) × 1012 Mo˙ with μL ∼ 10-30 the average lens magnification factor). Our results suggest that the turbulent interstellar medium present in the LPs can be well characterized by a high turbulent velocity dispersion («ΔVturb» ∼ 100 km s-1) and ratios of gas kinetic temperature to dust temperature «T kin/T d» ∼ 2.5, sustained on scales larger than a few kiloparsecs. We speculate that the average surface density of the molecular gas mass and IR luminosity, Σ ∼ 103-4 M o˙ pc-2 and Σ ∼ 1011-12 L o˙ kpc-2, arise from both stellar mechanical feedback and a steady momentum injection from the accretion of intergalactic gas.

Original languageEnglish (US)
Article number95
JournalAstrophysical Journal
Volume908
Issue number1
DOIs
StatePublished - Feb 10 2021

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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