Concurrent Starbursts in Molecular Gas Disks within a Pair of Colliding Galaxies at z = 1.52

Silverman, J. D.; Daddi, E.; Rujopakarn, W.; Renzini, A.; Mancini, C.; Bournaud, F.; Puglisi, A.; Rodighiero, G.; Liu, D.; Sargent, M.; Arimoto, N.; Bethermin, M.; Fensch, J.; Hayward, C. C.; Kartaltepe, J.; Kashino, D.; Koekemoer, A.; Magdis, G.; McCracken, H. J.; Nagao, T.; Sheth, K.; Smolčić, Vernesa; Valentino, F

doi:10.3847/1538-4357/aae64b

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Scientific paper - Original scientific paper

Concurrent Starbursts in Molecular Gas Disks within a Pair of Colliding Galaxies at z = 1.52

Astrophysical Journal, 868 (2018); 75. https://doi.org/10.3847/1538-4357/aae64b

Silverman, J. D.; Daddi, E.; Rujopakarn, W.; Renzini, A.; Mancini, C.; Bournaud, F.; Puglisi, A.; Rodighiero, G.; Liu, D.; Sargent, M.; Arimoto, N.; Bethermin, M.; Fensch, J.; Hayward, C. C.; Kartaltepe, J.; Kashino, D.; Koekemoer, A.; Magdis, G.; McCracken, H. J.; Nagao, T.; Sheth, K.; Smolčić, Vernesa; Valentino, F More authors...

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APA 6th Edition

Silverman, J. D., Daddi, E., Rujopakarn, W., Renzini, A., Mancini, C., Bournaud, F. ... Valentino, F. (2018). Concurrent Starbursts in Molecular Gas Disks within a Pair of Colliding Galaxies at z = 1.52. Astrophysical Journal, 868.. doi: 10.3847/1538-4357/aae64b

MLA 8th Edition

Silverman, J. D., et al. "Concurrent Starbursts in Molecular Gas Disks within a Pair of Colliding Galaxies at z = 1.52." Astrophysical Journal, vol. 868, 2018. https://doi.org/10.3847/1538-4357/aae64b

Chicago 17th Edition

Silverman, J. D., E. Daddi, W. Rujopakarn, A. Renzini, C. Mancini, F. Bournaud, A. Puglisi, et al. "Concurrent Starbursts in Molecular Gas Disks within a Pair of Colliding Galaxies at z = 1.52." Astrophysical Journal 868 (2018). https://doi.org/10.3847/1538-4357/aae64b

Harvard

Silverman, J. D., et al. (2018) 'Concurrent Starbursts in Molecular Gas Disks within a Pair of Colliding Galaxies at z = 1.52', Astrophysical Journal, 868. doi: 10.3847/1538-4357/aae64b

Vancouver

Silverman JD, Daddi E, Rujopakarn W, Renzini A, Mancini C, Bournaud F, and sur.. Concurrent Starbursts in Molecular Gas Disks within a Pair of Colliding Galaxies at z = 1.52. Astrophysical Journal [Internet]. 2018 [cited 2024 April 24];868. doi: 10.3847/1538-4357/aae64b

IEEE

J. D. Silverman, et al., "Concurrent Starbursts in Molecular Gas Disks within a Pair of Colliding Galaxies at z = 1.52", Astrophysical Journal, vol. 868, 2018. [Online]. Available at: https://urn.nsk.hr/urn:nbn:hr:217:397985. [Accessed: 24 April 2024]

Cite this item: https://urn.nsk.hr/urn:nbn:hr:217:397985

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Metadata

Title (english)	Concurrent Starbursts in Molecular Gas Disks within a Pair of Colliding Galaxies at z = 1.52
Author	J. D. Silverman
Author	E. Daddi
Author	W. Rujopakarn
Author	A. Renzini
Author	C. Mancini
Author	F. Bournaud
Author	A. Puglisi
Author	G. Rodighiero
Author	D. Liu
Author	M. Sargent
Author	N. Arimoto
Author	M. Bethermin
Author	J. Fensch
Author	C. C. Hayward
Author	J. Kartaltepe
Author	D. Kashino
Author	A. Koekemoer
Author	G. Magdis
Author	H. J. McCracken
Author	T. Nagao
Author	K. Sheth
Author	Vernesa Smolčić MBZ: 336180
Author	F Valentino
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 report on the discovery of a merger-driven starburst at z = 1.52, PACS-787, based on high signal-to-noise ALMA observations. CO(5–4) and continuum emission (850 μm) at a spatial resolution of 0 3 reveal two compact (r_1/2 ∼ 1 kpc) and interacting molecular gas disks at a separation of 8.6 kpc, indicative of an early stage in a merger. With an SFR of 991 Me_⊙ yr^−1 , this starburst event should occur closer to final coalescence, as is usually seen in hydrodynamical simulations. From the CO size, inclination, and velocity profile for both disks, the dynamical mass is calculated through a novel method that incorporates a calibration using simulations of galaxy mergers. Based on the dynamical mass, we measure (1) the molecular gas mass, independent from the CO luminosity, (2) the ratio of the total gas mass and the CO(1–0) luminosity (α_CO ≡ M_gas/ L’CO 1-0 ), and (3) the gas-to-dust ratio, with the latter two being lower than typically assumed. We find that the high star formation triggered in both galaxies is caused by a set of optimal conditions: a high gas mass/fraction, a short depletion time (τ_depl = 85 and 67 Myr) to convert gas into stars, and the interaction of likely counter-rotating molecular disks that may accelerate the loss of angular momentum. The state of interaction is further established by the detection of diffuse CO and continuum emission, tidal debris that bridges the two nuclei and is associated with stellar emission seen by HST/WFC3. This observation demonstrates the power of ALMA to study the dynamics of galaxy mergers at high redshift.
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. 868, 75
p-ISSN	0004-637X
e-ISSN	1538-4357
DOI	https://doi.org/10.3847/1538-4357/aae64b
URN:NBN	urn:nbn:hr:217:397985
Publication	2018
Document URL	https://iopscience.iop.org/article/10.3847/1538-4357/aae64b
Type of resource	Text
Access conditions	Open access
Terms of use
Public note	© 2018. The American Astronomical Society. Received 2018 July 6; Revised 2018 September 19; Accepted 2018 October 1; Published 2018 November 21.
Created on	2020-03-01 16:45:32