Spatially Resolved [C ii] Emission in SPT0346-52: A Hyper-starburst Galaxy Merger at z ∼ 5.7

Katrina C. Litke; Daniel P. Marrone; Justin S. Spilker; Manuel Aravena; Matthieu Béthermin; Scott Chapman; Chian Chou Chen; Carlos De Breuck; Chenxing Dong; Anthony Gonzalez; Thomas R. Greve; Christopher C. Hayward; Yashar Hezaveh; Sreevani Jarugula; Jingzhe Ma; Warren Morningstar; Desika Narayanan; Kedar Phadke; Cassie Reuter; Joaquin Vieira; Axel Weiss

doi:10.3847/1538-4357/aaf057

Spatially Resolved [C ii] Emission in SPT0346-52: A Hyper-starburst Galaxy Merger at z ∼ 5.7

Katrina C. Litke, Daniel P. Marrone, Justin S. Spilker, Manuel Aravena, Matthieu Béthermin, Scott Chapman, Chian Chou Chen, Carlos De Breuck, Chenxing Dong, Anthony Gonzalez, Thomas R. Greve, Christopher C. Hayward, Yashar Hezaveh, Sreevani Jarugula, Jingzhe Ma, Warren Morningstar, Desika Narayanan, Kedar Phadke, Cassie Reuter, Joaquin VieiraAxel Weiss

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Abstract

SPT0346-52 is one of the most most luminous and intensely star-forming galaxies in the universe, with LFIR > 10¹³ L_⊙ 13 and Σ _SFR ≈ 4200 M_⊙ yr^-1 kpc ^-2. In this paper, we present ∼0.′15 ALMA observations of the [C II] 158 μm emission line in this z = 5.7 dusty star-forming galaxy. We use a pixellated lensing reconstruction code to spatially and kinematically resolve the source-plane [C II] and rest-frame 158 ?m dust continuum structure at ∼700 pc (∼0.′ 12) resolution. We discuss the [C II] deficit with a pixellated study of the L[C II]/LFIR ratio in the source plane. We find that individual pixels within the galaxy follow the same trend found using unresolved observations of other galaxies, indicating that the deficit arises on scales ≲700 pc. The lensing reconstruction reveals two spatially and kinematically separated components (∼1 kpc and ∼500 km s^-1 apart) connected by a bridge of gas. Both components are found to be globally unstable, with Toomre Q instability parameters ≪1 everywhere. We argue that SPT0346-52 is undergoing a major merger, which is likely driving the intense and compact star formation.

Original language	English (US)
Article number	80
Journal	Astrophysical Journal
Volume	870
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/aaf057
State	Published - Jan 10 2019

Keywords

galaxies: high-redshift
galaxies: starburst

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-4357/aaf057

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Litke, K. C., Marrone, D. P., Spilker, J. S., Aravena, M., Béthermin, M., Chapman, S., Chen, C. C., Breuck, C. D., Dong, C., Gonzalez, A., Greve, T. R., Hayward, C. C., Hezaveh, Y., Jarugula, S., Ma, J., Morningstar, W., Narayanan, D., Phadke, K., Reuter, C., ... Weiss, A. (2019). Spatially Resolved [C ii] Emission in SPT0346-52: A Hyper-starburst Galaxy Merger at z ∼ 5.7. Astrophysical Journal, 870(2), Article 80. https://doi.org/10.3847/1538-4357/aaf057

Litke, KC, Marrone, DP, Spilker, JS, Aravena, M, Béthermin, M, Chapman, S, Chen, CC, Breuck, CD, Dong, C, Gonzalez, A, Greve, TR, Hayward, CC, Hezaveh, Y, Jarugula, S, Ma, J, Morningstar, W, Narayanan, D, Phadke, K, Reuter, C, Vieira, J & Weiss, A 2019, 'Spatially Resolved [C ii] Emission in SPT0346-52: A Hyper-starburst Galaxy Merger at z ∼ 5.7', Astrophysical Journal, vol. 870, no. 2, 80. https://doi.org/10.3847/1538-4357/aaf057

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title = "Spatially Resolved [C ii] Emission in SPT0346-52: A Hyper-starburst Galaxy Merger at z ∼ 5.7",

abstract = "SPT0346-52 is one of the most most luminous and intensely star-forming galaxies in the universe, with LFIR > 1013 L⊙ 13 and Σ SFR ≈ 4200 M⊙ yr-1 kpc -2. In this paper, we present ∼0.′15 ALMA observations of the [C II] 158 μm emission line in this z = 5.7 dusty star-forming galaxy. We use a pixellated lensing reconstruction code to spatially and kinematically resolve the source-plane [C II] and rest-frame 158 ?m dust continuum structure at ∼700 pc (∼0.′ 12) resolution. We discuss the [C II] deficit with a pixellated study of the L[C II]/LFIR ratio in the source plane. We find that individual pixels within the galaxy follow the same trend found using unresolved observations of other galaxies, indicating that the deficit arises on scales ≲700 pc. The lensing reconstruction reveals two spatially and kinematically separated components (∼1 kpc and ∼500 km s-1 apart) connected by a bridge of gas. Both components are found to be globally unstable, with Toomre Q instability parameters ≪1 everywhere. We argue that SPT0346-52 is undergoing a major merger, which is likely driving the intense and compact star formation.",

keywords = "galaxies: high-redshift, galaxies: starburst",

author = "Litke, {Katrina C.} and Marrone, {Daniel P.} and Spilker, {Justin S.} and Manuel Aravena and Matthieu B{\'e}thermin and Scott Chapman and Chen, {Chian Chou} and Breuck, {Carlos De} and Chenxing Dong and Anthony Gonzalez and Greve, {Thomas R.} and Hayward, {Christopher C.} and Yashar Hezaveh and Sreevani Jarugula and Jingzhe Ma and Warren Morningstar and Desika Narayanan and Kedar Phadke and Cassie Reuter and Joaquin Vieira and Axel Weiss",

note = "K.C.L. and D.P.M. acknowledge support from the U.S. National Science Foundation (NSF) under awards AST-1715213 and AST-1312950 and K.C.L. through award SOSPA4-007 from the National Radio Astronomy Observatory (NRAO). J.V. acknowledges support from NSF award AST-1716127. This material has made use of the El Gato (supported by the NSF award MRI-1228509) high-performance computer. This paper makes use of the following ALMA data: ADS/ JAO.ALMA#2013.1.01231.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The SPT is supported by the National Science Foundation through grant PLR-1248097, with partial support through PHY1125897, the Kavli Foundation and the Gordon and Betty Moore Foundation grant GBMF 947. The Flatiron Institute is supported by the Simons Foundation. This research has made use of NASAs Astrophysics Data System.",

year = "2019",

month = jan,

day = "10",

doi = "10.3847/1538-4357/aaf057",

language = "English (US)",

volume = "870",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

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TY - JOUR

T1 - Spatially Resolved [C ii] Emission in SPT0346-52

T2 - A Hyper-starburst Galaxy Merger at z ∼ 5.7

AU - Litke, Katrina C.

AU - Marrone, Daniel P.

AU - Spilker, Justin S.

AU - Aravena, Manuel

AU - Béthermin, Matthieu

AU - Chapman, Scott

AU - Chen, Chian Chou

AU - Breuck, Carlos De

AU - Dong, Chenxing

AU - Gonzalez, Anthony

AU - Greve, Thomas R.

AU - Hayward, Christopher C.

AU - Hezaveh, Yashar

AU - Jarugula, Sreevani

AU - Ma, Jingzhe

AU - Morningstar, Warren

AU - Narayanan, Desika

AU - Phadke, Kedar

AU - Reuter, Cassie

AU - Vieira, Joaquin

AU - Weiss, Axel

N1 - K.C.L. and D.P.M. acknowledge support from the U.S. National Science Foundation (NSF) under awards AST-1715213 and AST-1312950 and K.C.L. through award SOSPA4-007 from the National Radio Astronomy Observatory (NRAO). J.V. acknowledges support from NSF award AST-1716127. This material has made use of the El Gato (supported by the NSF award MRI-1228509) high-performance computer. This paper makes use of the following ALMA data: ADS/ JAO.ALMA#2013.1.01231.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The SPT is supported by the National Science Foundation through grant PLR-1248097, with partial support through PHY1125897, the Kavli Foundation and the Gordon and Betty Moore Foundation grant GBMF 947. The Flatiron Institute is supported by the Simons Foundation. This research has made use of NASAs Astrophysics Data System.

PY - 2019/1/10

Y1 - 2019/1/10

N2 - SPT0346-52 is one of the most most luminous and intensely star-forming galaxies in the universe, with LFIR > 1013 L⊙ 13 and Σ SFR ≈ 4200 M⊙ yr-1 kpc -2. In this paper, we present ∼0.′15 ALMA observations of the [C II] 158 μm emission line in this z = 5.7 dusty star-forming galaxy. We use a pixellated lensing reconstruction code to spatially and kinematically resolve the source-plane [C II] and rest-frame 158 ?m dust continuum structure at ∼700 pc (∼0.′ 12) resolution. We discuss the [C II] deficit with a pixellated study of the L[C II]/LFIR ratio in the source plane. We find that individual pixels within the galaxy follow the same trend found using unresolved observations of other galaxies, indicating that the deficit arises on scales ≲700 pc. The lensing reconstruction reveals two spatially and kinematically separated components (∼1 kpc and ∼500 km s-1 apart) connected by a bridge of gas. Both components are found to be globally unstable, with Toomre Q instability parameters ≪1 everywhere. We argue that SPT0346-52 is undergoing a major merger, which is likely driving the intense and compact star formation.

AB - SPT0346-52 is one of the most most luminous and intensely star-forming galaxies in the universe, with LFIR > 1013 L⊙ 13 and Σ SFR ≈ 4200 M⊙ yr-1 kpc -2. In this paper, we present ∼0.′15 ALMA observations of the [C II] 158 μm emission line in this z = 5.7 dusty star-forming galaxy. We use a pixellated lensing reconstruction code to spatially and kinematically resolve the source-plane [C II] and rest-frame 158 ?m dust continuum structure at ∼700 pc (∼0.′ 12) resolution. We discuss the [C II] deficit with a pixellated study of the L[C II]/LFIR ratio in the source plane. We find that individual pixels within the galaxy follow the same trend found using unresolved observations of other galaxies, indicating that the deficit arises on scales ≲700 pc. The lensing reconstruction reveals two spatially and kinematically separated components (∼1 kpc and ∼500 km s-1 apart) connected by a bridge of gas. Both components are found to be globally unstable, with Toomre Q instability parameters ≪1 everywhere. We argue that SPT0346-52 is undergoing a major merger, which is likely driving the intense and compact star formation.

KW - galaxies: high-redshift

KW - galaxies: starburst

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U2 - 10.3847/1538-4357/aaf057

DO - 10.3847/1538-4357/aaf057

M3 - Article

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SN - 0004-637X

VL - 870

JO - Astrophysical Journal

JF - Astrophysical Journal

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ER -

Spatially Resolved [C ii] Emission in SPT0346-52: A Hyper-starburst Galaxy Merger at z ∼ 5.7

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