An ALMA view of the interstellar medium of the z = 4.77 lensed starburst SPT-S J213242-5802.9

M. Béthermin; C. De Breuck; B. Gullberg; M. Aravena; M. S. Bothwell; S. C. Chapman; A. H. Gonzalez; T. R. Greve; K. Litke; J. Ma; M. Malkan; D. P. Marrone; E. J. Murphy; J. S. Spilker; A. A. Stark; M. Strandet; J. D. Vieira; A. Weiß; N. Welikala

doi:10.1051/0004-6361/201527739

An ALMA view of the interstellar medium of the z = 4.77 lensed starburst SPT-S J213242-5802.9

M. Béthermin, C. De Breuck, B. Gullberg, M. Aravena, M. S. Bothwell, S. C. Chapman, A. H. Gonzalez, T. R. Greve, K. Litke, J. Ma, M. Malkan, D. P. Marrone, E. J. Murphy, J. S. Spilker, A. A. Stark, M. Strandet, J. D. Vieira, A. Weiß, N. Welikala

Astronomy

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Abstract

We present ALMA detections of the [NII] 205 μm and CO(12-11) emission lines, and the tentative detection of [CI] - for the strongly lensed (μ = 5.7 ± 0.5) dusty, star-forming galaxy SPT-S J213242-5802.9 (hereafter SPT2132-58) at z = 4.77. The [NII] and CO(12-11) lines are detected at 11.5 and 8.5σ levels, respectively, by our band 6 observations. The [CI] line is detected at 3.2σ after a reanalysis of existing band 3 data. The [CI] luminosity implies a gas mass of (3.8 ± 1.2) × 10¹⁰M_⊙, and, consequently, a very short depletion timescale of 34 ± 13 Myr and a CO luminosity to gas mass conversion factor α_CO of 1.0 ± 0.3 M_⊙ (K km s^-1 pc²)^-1. SPT2132-58 is an extreme starburst with an intrinsic star formation rate of 1100 ± 200 M_⊙/yr. We find a [CII]/[NII] ratio of 26 ± 6, which is the highest ratio reported at z > 4. This suggests that SPT2132-58 hosts an evolved interstellar medium (0.5 Z_⊙< Z < 1.5 Z_⊙), which may be dominated by photodissociation regions. The CO(2-1) and CO(5-4) transitions have lower CO to far-infrared ratios than local and high-redshift samples, while CO(12-11) is similar to these samples, suggesting the presence of an additional very excited component or an active galactic nucleus.

Original language	English (US)
Article number	L7
Journal	Astronomy and astrophysics
Volume	586
DOIs	https://doi.org/10.1051/0004-6361/201527739
State	Published - Feb 1 2016

Keywords

Galaxies: ISM
Galaxies: high-redshift
Galaxies: star formation
Galaxies: starburst
Submillimeter: galaxies

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Béthermin, M., De Breuck, C., Gullberg, B., Aravena, M., Bothwell, M. S., Chapman, S. C., Gonzalez, A. H., Greve, T. R., Litke, K., Ma, J., Malkan, M., Marrone, D. P., Murphy, E. J., Spilker, J. S., Stark, A. A., Strandet, M., Vieira, J. D., Weiß, A., & Welikala, N. (2016). An ALMA view of the interstellar medium of the z = 4.77 lensed starburst SPT-S J213242-5802.9. Astronomy and astrophysics, 586, Article L7. https://doi.org/10.1051/0004-6361/201527739

Béthermin, M, De Breuck, C, Gullberg, B, Aravena, M, Bothwell, MS, Chapman, SC, Gonzalez, AH, Greve, TR, Litke, K, Ma, J, Malkan, M, Marrone, DP, Murphy, EJ, Spilker, JS, Stark, AA, Strandet, M, Vieira, JD, Weiß, A & Welikala, N 2016, 'An ALMA view of the interstellar medium of the z = 4.77 lensed starburst SPT-S J213242-5802.9', Astronomy and astrophysics, vol. 586, L7. https://doi.org/10.1051/0004-6361/201527739

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title = "An ALMA view of the interstellar medium of the z = 4.77 lensed starburst SPT-S J213242-5802.9",

abstract = "We present ALMA detections of the [NII] 205 μm and CO(12-11) emission lines, and the tentative detection of [CI] - for the strongly lensed (μ = 5.7 ± 0.5) dusty, star-forming galaxy SPT-S J213242-5802.9 (hereafter SPT2132-58) at z = 4.77. The [NII] and CO(12-11) lines are detected at 11.5 and 8.5σ levels, respectively, by our band 6 observations. The [CI] line is detected at 3.2σ after a reanalysis of existing band 3 data. The [CI] luminosity implies a gas mass of (3.8 ± 1.2) × 1010M⊙, and, consequently, a very short depletion timescale of 34 ± 13 Myr and a CO luminosity to gas mass conversion factor αCO of 1.0 ± 0.3 M⊙ (K km s-1 pc2)-1. SPT2132-58 is an extreme starburst with an intrinsic star formation rate of 1100 ± 200 M⊙/yr. We find a [CII]/[NII] ratio of 26 ± 6, which is the highest ratio reported at z > 4. This suggests that SPT2132-58 hosts an evolved interstellar medium (0.5 Z⊙< Z < 1.5 Z⊙), which may be dominated by photodissociation regions. The CO(2-1) and CO(5-4) transitions have lower CO to far-infrared ratios than local and high-redshift samples, while CO(12-11) is similar to these samples, suggesting the presence of an additional very excited component or an active galactic nucleus.",

keywords = "Galaxies: ISM, Galaxies: high-redshift, Galaxies: star formation, Galaxies: starburst, Submillimeter: galaxies",

author = "M. B{\'e}thermin and {De Breuck}, C. and B. Gullberg and M. Aravena and Bothwell, {M. S.} and Chapman, {S. C.} and Gonzalez, {A. H.} and Greve, {T. R.} and K. Litke and J. Ma and M. Malkan and Marrone, {D. P.} and Murphy, {E. J.} and Spilker, {J. S.} and Stark, {A. A.} and M. Strandet and Vieira, {J. D.} and A. Wei{\ss} and N. Welikala",

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year = "2016",

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doi = "10.1051/0004-6361/201527739",

language = "English (US)",

volume = "586",

journal = "Astronomy and astrophysics",

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T1 - An ALMA view of the interstellar medium of the z = 4.77 lensed starburst SPT-S J213242-5802.9

AU - Béthermin, M.

AU - De Breuck, C.

AU - Gullberg, B.

AU - Aravena, M.

AU - Bothwell, M. S.

AU - Chapman, S. C.

AU - Gonzalez, A. H.

AU - Greve, T. R.

AU - Litke, K.

AU - Ma, J.

AU - Malkan, M.

AU - Marrone, D. P.

AU - Murphy, E. J.

AU - Spilker, J. S.

AU - Stark, A. A.

AU - Strandet, M.

AU - Vieira, J. D.

AU - Weiß, A.

AU - Welikala, N.

PY - 2016/2/1

Y1 - 2016/2/1

N2 - We present ALMA detections of the [NII] 205 μm and CO(12-11) emission lines, and the tentative detection of [CI] - for the strongly lensed (μ = 5.7 ± 0.5) dusty, star-forming galaxy SPT-S J213242-5802.9 (hereafter SPT2132-58) at z = 4.77. The [NII] and CO(12-11) lines are detected at 11.5 and 8.5σ levels, respectively, by our band 6 observations. The [CI] line is detected at 3.2σ after a reanalysis of existing band 3 data. The [CI] luminosity implies a gas mass of (3.8 ± 1.2) × 1010M⊙, and, consequently, a very short depletion timescale of 34 ± 13 Myr and a CO luminosity to gas mass conversion factor αCO of 1.0 ± 0.3 M⊙ (K km s-1 pc2)-1. SPT2132-58 is an extreme starburst with an intrinsic star formation rate of 1100 ± 200 M⊙/yr. We find a [CII]/[NII] ratio of 26 ± 6, which is the highest ratio reported at z > 4. This suggests that SPT2132-58 hosts an evolved interstellar medium (0.5 Z⊙< Z < 1.5 Z⊙), which may be dominated by photodissociation regions. The CO(2-1) and CO(5-4) transitions have lower CO to far-infrared ratios than local and high-redshift samples, while CO(12-11) is similar to these samples, suggesting the presence of an additional very excited component or an active galactic nucleus.

AB - We present ALMA detections of the [NII] 205 μm and CO(12-11) emission lines, and the tentative detection of [CI] - for the strongly lensed (μ = 5.7 ± 0.5) dusty, star-forming galaxy SPT-S J213242-5802.9 (hereafter SPT2132-58) at z = 4.77. The [NII] and CO(12-11) lines are detected at 11.5 and 8.5σ levels, respectively, by our band 6 observations. The [CI] line is detected at 3.2σ after a reanalysis of existing band 3 data. The [CI] luminosity implies a gas mass of (3.8 ± 1.2) × 1010M⊙, and, consequently, a very short depletion timescale of 34 ± 13 Myr and a CO luminosity to gas mass conversion factor αCO of 1.0 ± 0.3 M⊙ (K km s-1 pc2)-1. SPT2132-58 is an extreme starburst with an intrinsic star formation rate of 1100 ± 200 M⊙/yr. We find a [CII]/[NII] ratio of 26 ± 6, which is the highest ratio reported at z > 4. This suggests that SPT2132-58 hosts an evolved interstellar medium (0.5 Z⊙< Z < 1.5 Z⊙), which may be dominated by photodissociation regions. The CO(2-1) and CO(5-4) transitions have lower CO to far-infrared ratios than local and high-redshift samples, while CO(12-11) is similar to these samples, suggesting the presence of an additional very excited component or an active galactic nucleus.

KW - Galaxies: ISM

KW - Galaxies: high-redshift

KW - Galaxies: star formation

KW - Galaxies: starburst

KW - Submillimeter: galaxies

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U2 - 10.1051/0004-6361/201527739

DO - 10.1051/0004-6361/201527739

M3 - Article

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SN - 0004-6361

VL - 586

JO - Astronomy and astrophysics

JF - Astronomy and astrophysics

M1 - L7

ER -

An ALMA view of the interstellar medium of the z = 4.77 lensed starburst SPT-S J213242-5802.9

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