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 & 1 others Axel Weiss

Research output: Contribution to journalArticle

5 Citations (Scopus)

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 languageEnglish (US)
Article number80
JournalAstrophysical Journal
Volume870
Issue number2
DOIs
StatePublished - Jan 10 2019

Fingerprint

starburst galaxies
merger
galaxies
pixel
dust
stars
gas
star formation
universe
pixels
continuums
trends
plane source
gases
code
trend
parameter

Keywords

  • galaxies: high-redshift
  • galaxies: starburst

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Spatially Resolved [C ii] 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; Breuck, Carlos De; 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: Astrophysical Journal, Vol. 870, No. 2, 80, 10.01.2019.

Research output: Contribution to journalArticle

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
Litke, Katrina C. ; Marrone, Daniel P ; Spilker, Justin S. ; Aravena, Manuel ; Béthermin, Matthieu ; Chapman, Scott ; Chen, Chian Chou ; Breuck, Carlos De ; 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 [C ii] Emission in SPT0346-52 : A Hyper-starburst Galaxy Merger at z ∼ 5.7. In: Astrophysical Journal. 2019 ; Vol. 870, No. 2.
@article{67339a53a0d349ab8a69dd1066de4112,
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",
year = "2019",
month = "1",
day = "10",
doi = "10.3847/1538-4357/aaf057",
language = "English (US)",
volume = "870",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2",

}

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

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

UR - http://www.scopus.com/inward/record.url?scp=85060195962&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85060195962&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/aaf057

DO - 10.3847/1538-4357/aaf057

M3 - Article

VL - 870

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 80

ER -