ALMA resolves turbulent, rotating [CII] emission in a young starburst galaxy at z=4.8

Carlos De Breuck; Rebecca J. Williams; Mark Swinbank; Paola Caselli; Kristen Coppin; Timothy A. Davis; Roberto Maiolino; Tohru Nagao; Ian Smail; Fabian Walter; Axel Weiss; Martin Zwaan

doi:10.1051/0004-6361/201323331

ALMA resolves turbulent, rotating [CII] emission in a young starburst galaxy at z=4.8

Carlos De Breuck, Rebecca J. Williams, Mark Swinbank, Paola Caselli, Kristen Coppin, Timothy A. Davis, Roberto Maiolino, Tohru Nagao, Ian Smail, Fabian Walter, Axel Weiss, Martin Zwaan

Centre for Astrophysics Research (CAR)

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Abstract

We present spatially resolved Atacama Large Millimeter/submillimeter Array (ALMA) [CII] observations of the z=4.7555 submillimetre galaxy, ALESS 73.1. Our 0.5" FWHM map resolves the [CII] emitting gas which is centred close to the active galactic nucleus (AGN). The gas kinematics are dominated by rotation but with high turbulence, v_rot/sigma_int~3.1, and a Toomre Q parameter alpha_CO ~0.4. The diameter of the dust continuum emission is 80 Gyr^{-1}, especially since there are no clear indications of recent merger activity. Finally, our high signal-to-noise [CII] measurement revises the observed [NII]/[CII] ratio, which suggests a close to solar metallicity, unless the [CII] flux contains significant contributions from HII regions. Our observations suggest that ALESS73.1 is a nascent galaxy undergoing its first major burst of star formation, embedded within an unstable but metal-rich gas disk.

Original language	English
Article number	A59
Number of pages	10
Journal	Astronomy & Astrophysics
Volume	565
Early online date	12 May 2014
DOIs	https://doi.org/10.1051/0004-6361/201323331
Publication status	Published - 31 May 2014

Keywords

galaxies: high-redshift
galaxies: starburst
galaxies: kinematics and dynamics
galaxies: ISM

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10.1051/0004-6361/201323331

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@article{b57133e992ee49eb8bf032f80190e9c9,

title = "ALMA resolves turbulent, rotating [CII] emission in a young starburst galaxy at z=4.8",

abstract = "We present spatially resolved Atacama Large Millimeter/submillimeter Array (ALMA) [CII] observations of the z=4.7555 submillimetre galaxy, ALESS 73.1. Our 0.5{"} FWHM map resolves the [CII] emitting gas which is centred close to the active galactic nucleus (AGN). The gas kinematics are dominated by rotation but with high turbulence, v_rot/sigma_int~3.1, and a Toomre Q parameter alpha_CO ~0.4. The diameter of the dust continuum emission is 80 Gyr^{-1}, especially since there are no clear indications of recent merger activity. Finally, our high signal-to-noise [CII] measurement revises the observed [NII]/[CII] ratio, which suggests a close to solar metallicity, unless the [CII] flux contains significant contributions from HII regions. Our observations suggest that ALESS73.1 is a nascent galaxy undergoing its first major burst of star formation, embedded within an unstable but metal-rich gas disk.",

keywords = "galaxies: high-redshift, galaxies: starburst, galaxies: kinematics and dynamics, galaxies: ISM",

author = "Breuck, {Carlos De} and Williams, {Rebecca J.} and Mark Swinbank and Paola Caselli and Kristen Coppin and Davis, {Timothy A.} and Roberto Maiolino and Tohru Nagao and Ian Smail and Fabian Walter and Axel Weiss and Martin Zwaan",

note = "Reproduced with permission from Astronomy & Astrophysics, {\textcopyright} ESO 2014.",

year = "2014",

month = may,

day = "31",

doi = "10.1051/0004-6361/201323331",

language = "English",

volume = "565",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

TY - JOUR

T1 - ALMA resolves turbulent, rotating [CII] emission in a young starburst galaxy at z=4.8

AU - Breuck, Carlos De

AU - Williams, Rebecca J.

AU - Swinbank, Mark

AU - Caselli, Paola

AU - Coppin, Kristen

AU - Davis, Timothy A.

AU - Maiolino, Roberto

AU - Nagao, Tohru

AU - Smail, Ian

AU - Walter, Fabian

AU - Weiss, Axel

AU - Zwaan, Martin

PY - 2014/5/31

Y1 - 2014/5/31

N2 - We present spatially resolved Atacama Large Millimeter/submillimeter Array (ALMA) [CII] observations of the z=4.7555 submillimetre galaxy, ALESS 73.1. Our 0.5" FWHM map resolves the [CII] emitting gas which is centred close to the active galactic nucleus (AGN). The gas kinematics are dominated by rotation but with high turbulence, v_rot/sigma_int~3.1, and a Toomre Q parameter alpha_CO ~0.4. The diameter of the dust continuum emission is 80 Gyr^{-1}, especially since there are no clear indications of recent merger activity. Finally, our high signal-to-noise [CII] measurement revises the observed [NII]/[CII] ratio, which suggests a close to solar metallicity, unless the [CII] flux contains significant contributions from HII regions. Our observations suggest that ALESS73.1 is a nascent galaxy undergoing its first major burst of star formation, embedded within an unstable but metal-rich gas disk.

AB - We present spatially resolved Atacama Large Millimeter/submillimeter Array (ALMA) [CII] observations of the z=4.7555 submillimetre galaxy, ALESS 73.1. Our 0.5" FWHM map resolves the [CII] emitting gas which is centred close to the active galactic nucleus (AGN). The gas kinematics are dominated by rotation but with high turbulence, v_rot/sigma_int~3.1, and a Toomre Q parameter alpha_CO ~0.4. The diameter of the dust continuum emission is 80 Gyr^{-1}, especially since there are no clear indications of recent merger activity. Finally, our high signal-to-noise [CII] measurement revises the observed [NII]/[CII] ratio, which suggests a close to solar metallicity, unless the [CII] flux contains significant contributions from HII regions. Our observations suggest that ALESS73.1 is a nascent galaxy undergoing its first major burst of star formation, embedded within an unstable but metal-rich gas disk.

KW - galaxies: high-redshift

KW - galaxies: starburst

KW - galaxies: kinematics and dynamics

KW - galaxies: ISM

U2 - 10.1051/0004-6361/201323331

DO - 10.1051/0004-6361/201323331

M3 - Article

SN - 0004-6361

VL - 565

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - A59

ER -

ALMA resolves turbulent, rotating [CII] emission in a young starburst galaxy at z=4.8

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Keywords

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