Detection of molecular gas in an ALMA [C II]-identified submillimetre galaxy at z = 4.44

M. T. Huynh; A. E. Kimball; R. P. Norris; I. 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 [C II]-identified submillimetre galaxy at z = 4.44

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

Western Sydney University

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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 ~1.7ÃÂ1010M⊙. 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 ofG0 ~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[C II]/LFIR = 1.0 xÂ 10-3 observed in ALESS65.1, combined with L[C II]/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: Letters
Volume	443
Issue number	1
DOIs	https://doi.org/10.1093/mnrasl/slu077
Publication status	Published - 2014

Keywords

evolution
galaxies
radio lines

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10.1093/mnrasl/slu077

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@article{97374de0653046a586d3f69ef0fa07e0,

title = "Detection of molecular gas in an ALMA [C II]-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{\~A}{\^A}1010M⊙. 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 ofG0 ~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[C II]/LFIR = 1.0 x{\^A} 10-3 observed in ALESS65.1, combined with L[C II]/LCO ~ 2300, is consistent with ALESS65.1 having more extended regions of intense star formation than local ULIRGs.",

keywords = "evolution, galaxies, radio lines",

author = "Huynh, {M. T.} and Kimball, {A. E.} and Norris, {R. P.} and I. 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.}",

year = "2014",

doi = "10.1093/mnrasl/slu077",

language = "English",

volume = "443",

pages = "L54--L58",

journal = "Monthly Notices of the Royal Astronomical Society: Letters",

issn = "1745-3925",

publisher = "Wiley-Blackwell Publishing",

number = "1",

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TY - JOUR

T1 - Detection of molecular gas in an ALMA [C II]-identified submillimetre galaxy at z = 4.44

AU - Huynh, M. T.

AU - Kimball, A. E.

AU - Norris, R. P.

AU - Smail, I.

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.

PY - 2014

Y1 - 2014

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 ~1.7ÃÂ1010M⊙. 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 ofG0 ~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[C II]/LFIR = 1.0 xÂ 10-3 observed in ALESS65.1, combined with L[C II]/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 ~1.7ÃÂ1010M⊙. 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 ofG0 ~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[C II]/LFIR = 1.0 xÂ 10-3 observed in ALESS65.1, combined with L[C II]/LCO ~ 2300, is consistent with ALESS65.1 having more extended regions of intense star formation than local ULIRGs.

KW - evolution

KW - galaxies

KW - radio lines

UR - http://handle.westernsydney.edu.au:8081/1959.7/uws:41538

U2 - 10.1093/mnrasl/slu077

DO - 10.1093/mnrasl/slu077

M3 - Article

SN - 1745-3925

VL - 443

SP - L54-L58

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

IS - 1

ER -

Detection of molecular gas in an ALMA [C II]-identified submillimetre galaxy at z = 4.44

Abstract

Keywords

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