Detection of molecular gas in an ALMA [CII]-identified Submillimetre Galaxy at z = 4.44

M. T. Huynh; A. E. Kimball; R. P. Norris; Ian Smail; K. E. Chow; K. E. K. Coppin; B. H. C. Emonts; R. J. Ivison; V. Smolcic; A. M. Swinbank

doi:10.1093/mnrasl/slu077

Detection of molecular gas in an ALMA [CII]-identified Submillimetre Galaxy at z = 4.44

M. T. Huynh, A. E. Kimball, R. P. Norris, Ian Smail, K. E. Chow, K. E. K. Coppin, B. H. C. Emonts, R. J. Ivison, V. Smolcic, A. M. Swinbank

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Abstract

We present the detection of 12CO(2–1) in the z = 4.44 submillimetre galaxy ALESS65.1 using the Australia Telescope Compact Array. A previous Atacama Large Millimeter/submillimeter Array study of submillimetre galaxies (SMGs) in the Extended Chandra Deep Field South determined the redshift of this optically and near-infrared undetected source through the measurement of [C II] 157.74 μm emission. Using the luminosity of the 12CO(2–1) emission, we estimate the gas mass to be Mgas ∼ 1.7 × 1010 M⊙. The gas depletion time-scale of ALESS65.1 is ∼ 25 Myr, similar to other high-redshift SMGs and consistent with z > 4 SMGs being the progenitors of massive ‘red-and-dead’ galaxies at z > 2. The ratio of the [C II], 12CO and far-infrared luminosities implies a strong far-ultraviolet field of G0 ∼ 103.25, which is at the high end of the far-ultraviolet fields seen in local starbursts, but weaker than the far-ultraviolet fields of most nearby ultraluminous infrared galaxies (ULIRGs). The high ratio of L[CII]/LFIR=1.0×10−3L[CII]/LFIR=1.0×10−3 observed in ALESS65.1, combined with L[CII]/LCO∼2300L[CII]/LCO∼2300, is consistent with ALESS65.1 having more extended regions of intense star formation than local ULIRGs.

Original language	English
Pages (from-to)	L54-L58
Number of pages	5
Journal	Monthly Notices of the Royal Astronomical Society (MNRAS)
Volume	443
Issue number	1
DOIs	https://doi.org/10.1093/mnrasl/slu077
Publication status	Published - 1 Sept 2014

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astro-ph.GA

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@article{1b9fb5c9f6da4f898ddec3f32e0c185d,

title = "Detection of molecular gas in an ALMA [CII]-identified Submillimetre Galaxy at z = 4.44",

abstract = "We present the detection of 12CO(2–1) in the z = 4.44 submillimetre galaxy ALESS65.1 using the Australia Telescope Compact Array. A previous Atacama Large Millimeter/submillimeter Array study of submillimetre galaxies (SMGs) in the Extended Chandra Deep Field South determined the redshift of this optically and near-infrared undetected source through the measurement of [C II] 157.74 μm emission. Using the luminosity of the 12CO(2–1) emission, we estimate the gas mass to be Mgas ∼ 1.7 × 1010 M⊙. The gas depletion time-scale of ALESS65.1 is ∼ 25 Myr, similar to other high-redshift SMGs and consistent with z > 4 SMGs being the progenitors of massive {\textquoteleft}red-and-dead{\textquoteright} galaxies at z > 2. The ratio of the [C II], 12CO and far-infrared luminosities implies a strong far-ultraviolet field of G0 ∼ 103.25, which is at the high end of the far-ultraviolet fields seen in local starbursts, but weaker than the far-ultraviolet fields of most nearby ultraluminous infrared galaxies (ULIRGs). The high ratio of L[CII]/LFIR=1.0×10−3L[CII]/LFIR=1.0×10−3 observed in ALESS65.1, combined with L[CII]/LCO∼2300L[CII]/LCO∼2300, is consistent with ALESS65.1 having more extended regions of intense star formation than local ULIRGs.",

keywords = "astro-ph.GA",

author = "Huynh, {M. T.} and Kimball, {A. E.} and Norris, {R. P.} and Ian Smail and Chow, {K. E.} and Coppin, {K. E. K.} and Emonts, {B. H. C.} and Ivison, {R. J.} and V. Smolcic and Swinbank, {A. M.}",

note = "This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. {\textcopyright} 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. ",

year = "2014",

month = sep,

day = "1",

doi = "10.1093/mnrasl/slu077",

language = "English",

volume = "443",

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journal = "Monthly Notices of the Royal Astronomical Society (MNRAS)",

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T1 - Detection of molecular gas in an ALMA [CII]-identified Submillimetre Galaxy at z = 4.44

AU - Huynh, M. T.

AU - Kimball, A. E.

AU - Norris, R. P.

AU - Smail, Ian

AU - Chow, K. E.

AU - Coppin, K. E. K.

AU - Emonts, B. H. C.

AU - Ivison, R. J.

AU - Smolcic, V.

AU - Swinbank, A. M.

N1 - This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.

PY - 2014/9/1

Y1 - 2014/9/1

N2 - We present the detection of 12CO(2–1) in the z = 4.44 submillimetre galaxy ALESS65.1 using the Australia Telescope Compact Array. A previous Atacama Large Millimeter/submillimeter Array study of submillimetre galaxies (SMGs) in the Extended Chandra Deep Field South determined the redshift of this optically and near-infrared undetected source through the measurement of [C II] 157.74 μm emission. Using the luminosity of the 12CO(2–1) emission, we estimate the gas mass to be Mgas ∼ 1.7 × 1010 M⊙. The gas depletion time-scale of ALESS65.1 is ∼ 25 Myr, similar to other high-redshift SMGs and consistent with z > 4 SMGs being the progenitors of massive ‘red-and-dead’ galaxies at z > 2. The ratio of the [C II], 12CO and far-infrared luminosities implies a strong far-ultraviolet field of G0 ∼ 103.25, which is at the high end of the far-ultraviolet fields seen in local starbursts, but weaker than the far-ultraviolet fields of most nearby ultraluminous infrared galaxies (ULIRGs). The high ratio of L[CII]/LFIR=1.0×10−3L[CII]/LFIR=1.0×10−3 observed in ALESS65.1, combined with L[CII]/LCO∼2300L[CII]/LCO∼2300, is consistent with ALESS65.1 having more extended regions of intense star formation than local ULIRGs.

AB - We present the detection of 12CO(2–1) in the z = 4.44 submillimetre galaxy ALESS65.1 using the Australia Telescope Compact Array. A previous Atacama Large Millimeter/submillimeter Array study of submillimetre galaxies (SMGs) in the Extended Chandra Deep Field South determined the redshift of this optically and near-infrared undetected source through the measurement of [C II] 157.74 μm emission. Using the luminosity of the 12CO(2–1) emission, we estimate the gas mass to be Mgas ∼ 1.7 × 1010 M⊙. The gas depletion time-scale of ALESS65.1 is ∼ 25 Myr, similar to other high-redshift SMGs and consistent with z > 4 SMGs being the progenitors of massive ‘red-and-dead’ galaxies at z > 2. The ratio of the [C II], 12CO and far-infrared luminosities implies a strong far-ultraviolet field of G0 ∼ 103.25, which is at the high end of the far-ultraviolet fields seen in local starbursts, but weaker than the far-ultraviolet fields of most nearby ultraluminous infrared galaxies (ULIRGs). The high ratio of L[CII]/LFIR=1.0×10−3L[CII]/LFIR=1.0×10−3 observed in ALESS65.1, combined with L[CII]/LCO∼2300L[CII]/LCO∼2300, is consistent with ALESS65.1 having more extended regions of intense star formation than local ULIRGs.

KW - astro-ph.GA

U2 - 10.1093/mnrasl/slu077

DO - 10.1093/mnrasl/slu077

M3 - Article

SN - 0035-8711

VL - 443

SP - L54-L58

JO - Monthly Notices of the Royal Astronomical Society (MNRAS)

JF - Monthly Notices of the Royal Astronomical Society (MNRAS)

IS - 1

ER -

Detection of molecular gas in an ALMA [CII]-identified Submillimetre Galaxy at z = 4.44

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