Spatially resolved [cii] 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

Spatially resolved [cii] 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

Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

SPT0346-52 is one of the most most luminous and intensely star-forming galaxies in the universe, with L_FIR ≻ 10¹³ L_☉ and Σ_SFR ≈ 4200 M_☉ yr⁻¹ kpc⁻². In this paper, we present ∼ 0⁰⁰ . 15 ALMA observations of the [CII]158µm 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 [CII] and rest-frame 158µm dust continuum structure at ∼ 700 pc (∼ 0⁰⁰ . 12) resolution. We discuss the [CII] deficit with a pixellated study of the L_[CII]/L_FIR 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)
Journal	Unknown Journal
State	Published - Nov 19 2018

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Litke, K. C., Marrone, D. P., Spilker, J. S., Aravena, M., Béthermin, M., Chapman, S., Chen, C. C., de Breuck, C., 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. (2018). Spatially resolved [cii] emission in SPT0346-52: A hyper-starburst galaxy merger at z ∼ 5.7. Unknown Journal.

Spatially resolved [cii] emission in SPT0346-52 : A hyper-starburst galaxy merger at z ∼ 5.7. / Litke, Katrina C.; Marrone, Daniel P.; Spilker, Justin S.; Aravena, Manuel; Béthermin, Matthieu; Chapman, Scott; Chen, Chian Chou; de Breuck, Carlos; Dong, Chenxing; Gonzalez, Anthony; Greve, Thomas R.; Hayward, Christopher C.; Hezaveh, Yashar; Jarugula, Sreevani; Ma, Jingzhe; Morningstar, Warren; Narayanan, Desika; Phadke, Kedar; Reuter, Cassie; Vieira, Joaquin; Weiß, Axel.

In: Unknown Journal, 19.11.2018.

Research output: Contribution to journal › Article › peer-review

Litke, KC, Marrone, DP, Spilker, JS, Aravena, M, Béthermin, M, Chapman, S, Chen, CC, de Breuck, C, 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 2018, 'Spatially resolved [cii] emission in SPT0346-52: A hyper-starburst galaxy merger at z ∼ 5.7', Unknown Journal.

Litke, Katrina C. ; Marrone, Daniel P. ; Spilker, Justin S. ; Aravena, Manuel ; Béthermin, Matthieu ; Chapman, Scott ; Chen, Chian Chou ; de Breuck, Carlos ; Dong, Chenxing ; Gonzalez, Anthony ; Greve, Thomas R. ; Hayward, Christopher C. ; Hezaveh, Yashar ; Jarugula, Sreevani ; Ma, Jingzhe ; Morningstar, Warren ; Narayanan, Desika ; Phadke, Kedar ; Reuter, Cassie ; Vieira, Joaquin ; Weiß, Axel. / Spatially resolved [cii] emission in SPT0346-52 : A hyper-starburst galaxy merger at z ∼ 5.7. In: Unknown Journal. 2018.

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title = "Spatially resolved [cii] 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☉ and ΣSFR ≈ 4200 M☉ yr−1 kpc−2. In this paper, we present ∼ 000 . 15 ALMA observations of the [CII]158µm 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 [CII] and rest-frame 158µm dust continuum structure at ∼ 700 pc (∼ 000 . 12) resolution. We discuss the [CII] deficit with a pixellated study of the L[CII]/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.",

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 {de Breuck}, Carlos 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 Wei{\ss}",

year = "2018",

month = nov,

day = "19",

language = "English (US)",

journal = "Nuclear Physics A",

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TY - JOUR

T1 - Spatially resolved [cii] 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 - de Breuck, Carlos

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

PY - 2018/11/19

Y1 - 2018/11/19

N2 - SPT0346-52 is one of the most most luminous and intensely star-forming galaxies in the universe, with LFIR ≻ 1013 L☉ and ΣSFR ≈ 4200 M☉ yr−1 kpc−2. In this paper, we present ∼ 000 . 15 ALMA observations of the [CII]158µm 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 [CII] and rest-frame 158µm dust continuum structure at ∼ 700 pc (∼ 000 . 12) resolution. We discuss the [CII] deficit with a pixellated study of the L[CII]/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☉ and ΣSFR ≈ 4200 M☉ yr−1 kpc−2. In this paper, we present ∼ 000 . 15 ALMA observations of the [CII]158µm 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 [CII] and rest-frame 158µm dust continuum structure at ∼ 700 pc (∼ 000 . 12) resolution. We discuss the [CII] deficit with a pixellated study of the L[CII]/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.

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