Planck's Dusty GEMS: II. Extended [CII] emission and absorption in the Garnet at z = 3.4 seen with ALMA

N. Nesvadba, R. Kneissl, R. Cañameras, F. Boone, E. Falgarone, Brenda Louise Frye, M. Gerin, S. Koenig, G. Lagache, E. Le Floc'h, S. Malhotra, D. Scott

Research output: Contribution to journalArticle

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Abstract

We present spatially resolved ALMA [CII] observations of the bright (flux density S350 = 400 mJy at 350 μm), gravitationally lensed, starburst galaxy PLCK G045.1+61.1 at z = 3.427, the "Garnet". This source is part of our set of "Planck's Dusty GEMS", discovered with the Planck's all-sky survey. Two emission-line clouds with a relative velocity offset of ∼600 km s-1 extend towards north-east and south-west, respectively, of a small, intensely star-forming clump with a star-formation intensity of 220 M yr-1 kpc-2, akin to maximal starbursts. [CII] is also seen in absorption, with a redshift of +350 km s-1 relative to the brightest CO component. [CII] absorption has previously only been found in the Milky Way along sightlines toward bright high-mass star-forming regions, and this is the first detection in another galaxy. Similar to Galactic environments, the [CII] absorption feature is associated with [CI] emission, implying that this is diffuse gas shielded from the UV radiation of the clump, and likely at large distances from the clump. Since absorption can only be seen in front of a continuum source, the gas in this structure can definitely be attributed to gas flowing towards the clump. The absorber could be part of a cosmic filament or merger debris being accreted onto the galaxy. We discuss our results also in light of the on-going debate of the origin of the [CII] deficit in dusty star-forming galaxies.

Original languageEnglish (US)
Article numberL2
JournalAstronomy and Astrophysics
Volume593
DOIs
StatePublished - Sep 1 2016

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clumps
garnets
garnet
galaxies
stars
gases
gas
starburst galaxies
debris
merger
star formation
absorbers
filaments
flux density
continuums
radiation

Keywords

  • Galaxies: high-redshift
  • Galaxies: ISM
  • Galaxies: kinematics and dynamics
  • Galaxies: starburst
  • Galaxy: formation
  • Infrared: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Planck's Dusty GEMS : II. Extended [CII] emission and absorption in the Garnet at z = 3.4 seen with ALMA. / Nesvadba, N.; Kneissl, R.; Cañameras, R.; Boone, F.; Falgarone, E.; Frye, Brenda Louise; Gerin, M.; Koenig, S.; Lagache, G.; Le Floc'h, E.; Malhotra, S.; Scott, D.

In: Astronomy and Astrophysics, Vol. 593, L2, 01.09.2016.

Research output: Contribution to journalArticle

Nesvadba, N, Kneissl, R, Cañameras, R, Boone, F, Falgarone, E, Frye, BL, Gerin, M, Koenig, S, Lagache, G, Le Floc'h, E, Malhotra, S & Scott, D 2016, 'Planck's Dusty GEMS: II. Extended [CII] emission and absorption in the Garnet at z = 3.4 seen with ALMA', Astronomy and Astrophysics, vol. 593, L2. https://doi.org/10.1051/0004-6361/201629037
Nesvadba, N. ; Kneissl, R. ; Cañameras, R. ; Boone, F. ; Falgarone, E. ; Frye, Brenda Louise ; Gerin, M. ; Koenig, S. ; Lagache, G. ; Le Floc'h, E. ; Malhotra, S. ; Scott, D. / Planck's Dusty GEMS : II. Extended [CII] emission and absorption in the Garnet at z = 3.4 seen with ALMA. In: Astronomy and Astrophysics. 2016 ; Vol. 593.
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abstract = "We present spatially resolved ALMA [CII] observations of the bright (flux density S350 = 400 mJy at 350 μm), gravitationally lensed, starburst galaxy PLCK G045.1+61.1 at z = 3.427, the {"}Garnet{"}. This source is part of our set of {"}Planck's Dusty GEMS{"}, discovered with the Planck's all-sky survey. Two emission-line clouds with a relative velocity offset of ∼600 km s-1 extend towards north-east and south-west, respectively, of a small, intensely star-forming clump with a star-formation intensity of 220 M⊙ yr-1 kpc-2, akin to maximal starbursts. [CII] is also seen in absorption, with a redshift of +350 km s-1 relative to the brightest CO component. [CII] absorption has previously only been found in the Milky Way along sightlines toward bright high-mass star-forming regions, and this is the first detection in another galaxy. Similar to Galactic environments, the [CII] absorption feature is associated with [CI] emission, implying that this is diffuse gas shielded from the UV radiation of the clump, and likely at large distances from the clump. Since absorption can only be seen in front of a continuum source, the gas in this structure can definitely be attributed to gas flowing towards the clump. The absorber could be part of a cosmic filament or merger debris being accreted onto the galaxy. We discuss our results also in light of the on-going debate of the origin of the [CII] deficit in dusty star-forming galaxies.",
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T2 - II. Extended [CII] emission and absorption in the Garnet at z = 3.4 seen with ALMA

AU - Nesvadba, N.

AU - Kneissl, R.

AU - Cañameras, R.

AU - Boone, F.

AU - Falgarone, E.

AU - Frye, Brenda Louise

AU - Gerin, M.

AU - Koenig, S.

AU - Lagache, G.

AU - Le Floc'h, E.

AU - Malhotra, S.

AU - Scott, D.

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N2 - We present spatially resolved ALMA [CII] observations of the bright (flux density S350 = 400 mJy at 350 μm), gravitationally lensed, starburst galaxy PLCK G045.1+61.1 at z = 3.427, the "Garnet". This source is part of our set of "Planck's Dusty GEMS", discovered with the Planck's all-sky survey. Two emission-line clouds with a relative velocity offset of ∼600 km s-1 extend towards north-east and south-west, respectively, of a small, intensely star-forming clump with a star-formation intensity of 220 M⊙ yr-1 kpc-2, akin to maximal starbursts. [CII] is also seen in absorption, with a redshift of +350 km s-1 relative to the brightest CO component. [CII] absorption has previously only been found in the Milky Way along sightlines toward bright high-mass star-forming regions, and this is the first detection in another galaxy. Similar to Galactic environments, the [CII] absorption feature is associated with [CI] emission, implying that this is diffuse gas shielded from the UV radiation of the clump, and likely at large distances from the clump. Since absorption can only be seen in front of a continuum source, the gas in this structure can definitely be attributed to gas flowing towards the clump. The absorber could be part of a cosmic filament or merger debris being accreted onto the galaxy. We discuss our results also in light of the on-going debate of the origin of the [CII] deficit in dusty star-forming galaxies.

AB - We present spatially resolved ALMA [CII] observations of the bright (flux density S350 = 400 mJy at 350 μm), gravitationally lensed, starburst galaxy PLCK G045.1+61.1 at z = 3.427, the "Garnet". This source is part of our set of "Planck's Dusty GEMS", discovered with the Planck's all-sky survey. Two emission-line clouds with a relative velocity offset of ∼600 km s-1 extend towards north-east and south-west, respectively, of a small, intensely star-forming clump with a star-formation intensity of 220 M⊙ yr-1 kpc-2, akin to maximal starbursts. [CII] is also seen in absorption, with a redshift of +350 km s-1 relative to the brightest CO component. [CII] absorption has previously only been found in the Milky Way along sightlines toward bright high-mass star-forming regions, and this is the first detection in another galaxy. Similar to Galactic environments, the [CII] absorption feature is associated with [CI] emission, implying that this is diffuse gas shielded from the UV radiation of the clump, and likely at large distances from the clump. Since absorption can only be seen in front of a continuum source, the gas in this structure can definitely be attributed to gas flowing towards the clump. The absorber could be part of a cosmic filament or merger debris being accreted onto the galaxy. We discuss our results also in light of the on-going debate of the origin of the [CII] deficit in dusty star-forming galaxies.

KW - Galaxies: high-redshift

KW - Galaxies: ISM

KW - Galaxies: kinematics and dynamics

KW - Galaxies: starburst

KW - Galaxy: formation

KW - Infrared: galaxies

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