Chaotic and Clumpy Galaxy Formation in an Extremely Massive Reionization-era Halo
Publikation: Bidrag til tidsskrift › Letter › Forskning › fagfællebedømt
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Chaotic and Clumpy Galaxy Formation in an Extremely Massive Reionization-era Halo. / Spilker, Justin S.; Hayward, Christopher C.; Marrone, Daniel P.; Aravena, Manuel; Bethermin, Matthieu; Burgoyne, James; Chapman, Scott C.; Greve, Thomas R.; Gururajan, Gayathri; Hezaveh, Yashar D.; Hill, Ryley; Litke, Katrina C.; Lovell, Christopher C.; Malkan, Matthew A.; Murphy, Eric J.; Narayanan, Desika; Phadke, Kedar A.; Reuter, Cassie; Stark, Antony A.; Sulzenauer, Nikolaus; Vieira, Joaquin D.; Vizgan, David; Weiss, Axel.
I: Astrophysical Journal Letters, Bind 929, Nr. 1, 3, 01.04.2022.Publikation: Bidrag til tidsskrift › Letter › Forskning › fagfællebedømt
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TY - JOUR
T1 - Chaotic and Clumpy Galaxy Formation in an Extremely Massive Reionization-era Halo
AU - Spilker, Justin S.
AU - Hayward, Christopher C.
AU - Marrone, Daniel P.
AU - Aravena, Manuel
AU - Bethermin, Matthieu
AU - Burgoyne, James
AU - Chapman, Scott C.
AU - Greve, Thomas R.
AU - Gururajan, Gayathri
AU - Hezaveh, Yashar D.
AU - Hill, Ryley
AU - Litke, Katrina C.
AU - Lovell, Christopher C.
AU - Malkan, Matthew A.
AU - Murphy, Eric J.
AU - Narayanan, Desika
AU - Phadke, Kedar A.
AU - Reuter, Cassie
AU - Stark, Antony A.
AU - Sulzenauer, Nikolaus
AU - Vieira, Joaquin D.
AU - Vizgan, David
AU - Weiss, Axel
PY - 2022/4/1
Y1 - 2022/4/1
N2 - The SPT 0311-58 system at z = 6.900 is an extremely massive structure within the reionization epoch and offers a chance to understand the formation of galaxies at an extreme peak in the primordial density field. We present 70 mas Atacama Large Millimeter/submillimeter Array observations of the dust continuum and [C II] 158 mu m emission in the central pair of galaxies and reach physical resolutions of similar to 100-350 pc, among the most detailed views of any reionization-era system to date. The observations resolve the source into at least a dozen kiloparsecsize clumps. The global kinematics and high turbulent velocity dispersion within the galaxies present a striking contrast to recent claims of dynamically cold thin-disk kinematics in some dusty galaxies just 800 Myr later at z similar to 4. We speculate that both gravitational interactions and fragmentation from massive parent disks have likely played a role in the overall dynamics and formation of clumps in the system. Each clump individually is comparable in mass to other 6 < z < 8 galaxies identified in rest-UV/optical deep field surveys, but with star formation rates elevated by a factor of similar to 3-5. Internally, the clumps themselves bear close resemblance to greatly scaled-up versions of virialized cloud-scale structures identified in low-redshift galaxies. Our observations are qualitatively similar to the chaotic and clumpy assembly within massive halos seen in simulations of high-redshift galaxies.
AB - The SPT 0311-58 system at z = 6.900 is an extremely massive structure within the reionization epoch and offers a chance to understand the formation of galaxies at an extreme peak in the primordial density field. We present 70 mas Atacama Large Millimeter/submillimeter Array observations of the dust continuum and [C II] 158 mu m emission in the central pair of galaxies and reach physical resolutions of similar to 100-350 pc, among the most detailed views of any reionization-era system to date. The observations resolve the source into at least a dozen kiloparsecsize clumps. The global kinematics and high turbulent velocity dispersion within the galaxies present a striking contrast to recent claims of dynamically cold thin-disk kinematics in some dusty galaxies just 800 Myr later at z similar to 4. We speculate that both gravitational interactions and fragmentation from massive parent disks have likely played a role in the overall dynamics and formation of clumps in the system. Each clump individually is comparable in mass to other 6 < z < 8 galaxies identified in rest-UV/optical deep field surveys, but with star formation rates elevated by a factor of similar to 3-5. Internally, the clumps themselves bear close resemblance to greatly scaled-up versions of virialized cloud-scale structures identified in low-redshift galaxies. Our observations are qualitatively similar to the chaotic and clumpy assembly within massive halos seen in simulations of high-redshift galaxies.
KW - High-redshift galaxies
KW - Starburst galaxies
KW - STAR-FORMING GALAXIES
KW - MOLECULAR GAS
KW - DUSTY
KW - REDSHIFT
KW - CATALOGS
U2 - 10.3847/2041-8213/ac61e6
DO - 10.3847/2041-8213/ac61e6
M3 - Letter
VL - 929
JO - The Astrophysical Journal Letters
JF - The Astrophysical Journal Letters
SN - 2041-8205
IS - 1
M1 - 3
ER -
ID: 319536954