Herschel extreme lensing line observations

Dynamics of two strongly lensed star-forming galaxies near redshift z = 2

James E. Rhoads, Sangeeta Malhotra, Sahar Allam, Chris Carilli, Françoise Combes, Keely Finkelstein, Steven Finkelstein, Brenda Louise Frye, Maryvonne Gerin, Pierre Guillard, Nicole Nesvadba, Jane Rigby, Marco Spaans, Michael A. Strauss

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We report on two regularly rotating galaxies at redshift z 2, using high-resolution spectra of the bright [C II] 158 μm emission line from the HIFI instrument on the Herschel Space Observatory. Both SDSS090122.37+181432.3 ("S0901") and SDSSJ120602.09+514229.5 ("the Clone") are strongly lensed and show the double-horned line profile that is typical of rotating gas disks. Using a parametric disk model to fit the emission line profiles, we find that S0901 has a rotation speed of vsin (i) 120 ± 7 km s-1 and a gas velocity dispersion of σ g < 23 km s -1 (1σ). The best-fitting model for the Clone is a rotationally supported disk having vsin (i) 79 ± 11 km s-1 and σ g ≲ 4 km s-1 (1σ). However, the Clone is also consistent with a family of dispersion-dominated models having σ g = 92 ± 20 km s-1. Our results showcase the potential of the [C II] line as a kinematic probe of high-redshift galaxy dynamics: [C II] is bright, accessible to heterodyne receivers with exquisite velocity resolution, and traces dense star-forming interstellar gas. Future [C II] line observations with ALMA would offer the further advantage of spatial resolution, allowing a clearer separation between rotation and velocity dispersion.

Original languageEnglish (US)
Article number8
JournalAstrophysical Journal
Volume787
Issue number1
DOIs
StatePublished - May 20 2014

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clone
galaxies
stars
gas
interstellar gas
spatial resolution
observatory
profiles
kinematics
probe
gases
observatories
receivers
probes
high resolution
family
speed

Keywords

  • galaxies: evolution
  • galaxies: formation
  • galaxies: high-redshift

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Rhoads, J. E., Malhotra, S., Allam, S., Carilli, C., Combes, F., Finkelstein, K., ... Strauss, M. A. (2014). Herschel extreme lensing line observations: Dynamics of two strongly lensed star-forming galaxies near redshift z = 2. Astrophysical Journal, 787(1), [8]. https://doi.org/10.1088/0004-637X/787/1/8

Herschel extreme lensing line observations : Dynamics of two strongly lensed star-forming galaxies near redshift z = 2. / Rhoads, James E.; Malhotra, Sangeeta; Allam, Sahar; Carilli, Chris; Combes, Françoise; Finkelstein, Keely; Finkelstein, Steven; Frye, Brenda Louise; Gerin, Maryvonne; Guillard, Pierre; Nesvadba, Nicole; Rigby, Jane; Spaans, Marco; Strauss, Michael A.

In: Astrophysical Journal, Vol. 787, No. 1, 8, 20.05.2014.

Research output: Contribution to journalArticle

Rhoads, JE, Malhotra, S, Allam, S, Carilli, C, Combes, F, Finkelstein, K, Finkelstein, S, Frye, BL, Gerin, M, Guillard, P, Nesvadba, N, Rigby, J, Spaans, M & Strauss, MA 2014, 'Herschel extreme lensing line observations: Dynamics of two strongly lensed star-forming galaxies near redshift z = 2', Astrophysical Journal, vol. 787, no. 1, 8. https://doi.org/10.1088/0004-637X/787/1/8
Rhoads, James E. ; Malhotra, Sangeeta ; Allam, Sahar ; Carilli, Chris ; Combes, Françoise ; Finkelstein, Keely ; Finkelstein, Steven ; Frye, Brenda Louise ; Gerin, Maryvonne ; Guillard, Pierre ; Nesvadba, Nicole ; Rigby, Jane ; Spaans, Marco ; Strauss, Michael A. / Herschel extreme lensing line observations : Dynamics of two strongly lensed star-forming galaxies near redshift z = 2. In: Astrophysical Journal. 2014 ; Vol. 787, No. 1.
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AU - Carilli, Chris

AU - Combes, Françoise

AU - Finkelstein, Keely

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