The Redshift and Star Formation Mode of AzTEC2: A Pair of Massive Galaxies at z = 4.63

Jiménez-Andrade, E. F.; Zavala, J. A.; Magnelli, B.; Casey, C. M.; Liu, D.; Romano- Díaz, E.; Schinnerer, E.; Harrington, K.; Aretxaga, I.; Karim, A.; Staguhn, J.; Burnham, A. D.; Montaña, A.; Smolčić, Vernesa; Yun, M.; Bertoldi, F.; Hughes, D.

doi:10.3847/1538-4357/ab6dec

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Scientific paper - Original scientific paper

The Redshift and Star Formation Mode of AzTEC2: A Pair of Massive Galaxies at z = 4.63

Astrophysical Journal, 890 (2020), 2; 171. https://doi.org/10.3847/1538-4357/ab6dec

Jiménez-Andrade, E. F.; Zavala, J. A.; Magnelli, B.; Casey, C. M.; Liu, D.; Romano- Díaz, E.; Schinnerer, E.; Harrington, K.; Aretxaga, I.; Karim, A.; Staguhn, J.; Burnham, A. D.; Montaña, A.; Smolčić, Vernesa; Yun, M.; Bertoldi, F.; Hughes, D. More authors...

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APA 6th Edition

Jiménez Andrade, E. F., Zavala, J. A., Magnelli, B., Casey, C. M., Liu, D., Romano Díaz, E. ... Hughes, D. (2020). The Redshift and Star Formation Mode of AzTEC2: A Pair of Massive Galaxies at z = 4.63. Astrophysical Journal, 890. (2). doi: 10.3847/1538-4357/ab6dec

MLA 8th Edition

Jiménez Andrade, E. F., et al. "The Redshift and Star Formation Mode of AzTEC2: A Pair of Massive Galaxies at z = 4.63." Astrophysical Journal, vol. 890, no. 2, 2020. https://doi.org/10.3847/1538-4357/ab6dec

Chicago 17th Edition

Jiménez Andrade, E. F., J. A. Zavala, B. Magnelli, C. M. Casey, D. Liu, E. Romano Díaz, E. Schinnerer, et al. "The Redshift and Star Formation Mode of AzTEC2: A Pair of Massive Galaxies at z = 4.63." Astrophysical Journal 890, no. 2 (2020). https://doi.org/10.3847/1538-4357/ab6dec

Harvard

Jiménez Andrade, E. F., et al. (2020) 'The Redshift and Star Formation Mode of AzTEC2: A Pair of Massive Galaxies at z = 4.63', Astrophysical Journal, 890(2). doi: 10.3847/1538-4357/ab6dec

Vancouver

Jiménez Andrade EF, Zavala JA, Magnelli B, Casey CM, Liu D, Romano Díaz E, and sur.. The Redshift and Star Formation Mode of AzTEC2: A Pair of Massive Galaxies at z = 4.63. Astrophysical Journal [Internet]. 2020 [cited 2024 April 19];890(2). doi: 10.3847/1538-4357/ab6dec

IEEE

E. F. Jiménez Andrade, et al., "The Redshift and Star Formation Mode of AzTEC2: A Pair of Massive Galaxies at z = 4.63", Astrophysical Journal, vol. 890, no. 2, 2020. [Online]. Available at: https://urn.nsk.hr/urn:nbn:hr:217:915507. [Accessed: 19 April 2024]

Cite this item: https://urn.nsk.hr/urn:nbn:hr:217:915507

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Metadata

Title (english)	The Redshift and Star Formation Mode of AzTEC2: A Pair of Massive Galaxies at z = 4.63
Author	E. F. Jiménez-Andrade
Author	J. A. Zavala
Author	B. Magnelli
Author	C. M. Casey
Author	D. Liu
Author	E. Romano- Díaz
Author	E. Schinnerer
Author	K. Harrington
Author	I. Aretxaga
Author	A. Karim
Author	J. Staguhn
Author	A. D. Burnham
Author	A. Montaña
Author	Vernesa Smolčić MBZ: 336180
Author	M. Yun
Author	F. Bertoldi
Author	D. Hughes
Author's institution	University of Zagreb Faculty of Science (Department of Physics)
Scientific / art field, discipline and subdiscipline	NATURAL SCIENCES Physics Astronomy and Astrophysics
Abstract (english)	We combine observations from the Atacama Large Millimeter/submillimeter Array and the NOrthern Extended Millimeter Array to assess the redshift and to study the star formation conditions in AzTEC2, one of the brightest submillimeter galaxies (SMGs) in the COSMOS field (S_1.1mm = 10.5 ± 1.4 mJy). Our high-resolution observations confirm that AzTEC2 splits into two components (namely AzTEC2-A and AzTEC2-B) for which we detect [C II] and ^12CO(5 → 4) line emission, implying a redshift of 4.626 ± 0.001 (4.633 ± 0.001) for AzTEC2-A (AzTEC2-B) and ruling out previous associations with a galaxy at z ~ 1. We use the ^12CO(5 → 4) line emission and adopt typical SMG-like gas excitation conditions to estimate the molecular gas mass, which is M_gas (α_CO/2.5) = 2.1 ± 0.4 x 10^11 M_⊙ for AzTEC2- A, and a factor four lower for AzTEC2-B. With the infrared-derived star formation rate of AzTEC2-A (1920 ± 100 M_⊙ yr^-1 ) and AzTEC2-B (710 ± 35 M_⊙ yr^−1 ), they both will consume their current gas reservoir within (30–200) Myr. We find evidence of a rotation- dominated [C II] disk in AzTEC2-A, with a deprojected rotational velocity of v_rot(i = 39°) = 660 ± 130 km s^−1 , velocity dispersion ≲ 100 km s^−1 , and dynamical mass of M_dyn (i = 39°) = 2.6^+1.2_-0.9 x 10^11 M_⊙. We propose that an elevated gas accretion rate from the cosmic web might be the main driver of the intense levels of star formation in AzTEC2- A, which might be further enhanced by gravitational torques induced by its minor companion (AzTEC2- B). These results strengthen the picture whereby the population of single-dish selected SMGs is rather heterogeneous, including a population of pairs of massive, highly active galaxies in a pre-coalescence phase.
Keywords (english)
Language	english
Publication type	Scientific paper - Original scientific paper
Publication status	Published
Peer review	Peer review - international
Publication version	Published version
Journal title	Astrophysical Journal
Numbering	vol. 890, no. 2, 171
p-ISSN	0004-637X
e-ISSN	1538-4357
DOI	https://doi.org/10.3847/1538-4357/ab6dec
URN:NBN	urn:nbn:hr:217:915507
Publication	2020
Document URL	https://iopscience.iop.org/article/10.3847/1538-4357/ab6dec
Type of resource	Text
Access conditions	Open access
Terms of use
Public note	© 2020. The American Astronomical Society. All rights reserved. Received 2019 October 28. Accepted 2020 January 16. Published 2020 February 26.
Created on	2020-08-27 20:10:57