The ISM properties and gas kinematics of a redshift 3 massive dusty star-forming galaxy

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Title: The ISM properties and gas kinematics of a redshift 3 massive dusty star-forming galaxy
Authors: Leung, TKD
Riechers, DA
Baker, AJ
Clements, DL
Cooray, A
Hayward, CC
Ivison, RJ
Neri, R
Omont, A
Perez-Fournon, I
Scott, D
Wardlow, JL
Item Type: Journal Article
Abstract: We present CO (J = 1 → 0; 3 → 2; 5 → 4; 10 → 9) and 1.2 kpc resolution [C II] line observations of the dusty star-forming galaxy (SFG) HXMM05—carried out with the Karl G. Jansky Very Large Array, the Combined Array for Research in Millimeter-wave Astronomy, the Plateau de Bure Interferometer, and the Atacama Large Millimeter/submillimeter Array, measuring an unambiguous redshift of z = 2.9850 ± 0.0009. We find that HXMM05 is a hyperluminous infrared galaxy (LIR = (4 ± 1) × 1013 Le) with a total molecular gas mass of (2.1 ± 0.7) × 1011(aCO/0.8) Me. The CO (J = 1 → 0) and [C II] emission are extended over ∼9 kpc in diameter, and the CO line FWHM exceeds 1100 km s−1 . The [C II] emission shows a monotonic velocity gradient consistent with a disk, with a maximum rotation velocity of vc = 616 ± 100 km s−1 and a dynamical mass of (7.7 ± 3.1) × 1011 Me. We find a star formation rate of 2900- + 595 750 Me yr−1 . HXMM05 is thus among the most intensely SFGs known at high redshift. Photodissociation region modeling suggests physical conditions similar to nearby SFGs, showing extended star formation, which is consistent with our finding that the gas emission and dust emission are cospatial. Its molecular gas excitation resembles the local major merger Arp 220. The broad CO and [C II] lines and a pair of compact dust nuclei suggest the presence of a late-stage major merger at the center of the extended disk, again reminiscent of Arp 220. The observed gas kinematics and conditions, together with the presence of a companion and the pair of nuclei, suggest that HXMM05 is experiencing multiple mergers as a part of the evolution.
Issue Date: 24-Jan-2019
Date of Acceptance: 11-Dec-2018
URI: http://hdl.handle.net/10044/1/71774
DOI: https://doi.org/10.3847/1538-4357/aaf860
ISSN: 0004-637X
Publisher: American Astronomical Society
Journal / Book Title: Astrophysical Journal
Volume: 871
Issue: 1
Copyright Statement: © 2019 The American Astronomical Society. All rights reserved.
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST/F012373/1
ST/G003874/1
ST/J004812/1
ST/J001368/1
ST/K006401/1
ST/M003558/1
ST/P000568/1
ST-N000838
ST/N000838/1
ST/N005317/1
ST/L001314/1
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
galaxies: evolution
galaxies: high-redshift
galaxies: kinematics and dynamics
photon-dominated region (PDR)
quasars: individual (HXMM05)
submillimeter: ISM
SPACE-OBSERVATORY MEASUREMENTS
MOLECULAR GAS
SUBMILLIMETER GALAXIES
ROTATION CURVES
INTERSTELLAR-MEDIUM
C-II
DISK GALAXIES
PHOTODISSOCIATION REGIONS
PHYSICAL CONDITIONS
INFRARED-EMISSION
astro-ph.GA
astro-ph.GA
Science & Technology
Physical Sciences
Astronomy & Astrophysics
galaxies: evolution
galaxies: high-redshift
galaxies: kinematics and dynamics
photon-dominated region (PDR)
quasars: individual (HXMM05)
submillimeter: ISM
SPACE-OBSERVATORY MEASUREMENTS
MOLECULAR GAS
SUBMILLIMETER GALAXIES
ROTATION CURVES
INTERSTELLAR-MEDIUM
C-II
DISK GALAXIES
PHOTODISSOCIATION REGIONS
PHYSICAL CONDITIONS
INFRARED-EMISSION
0201 Astronomical and Space Sciences
0305 Organic Chemistry
0306 Physical Chemistry (incl. Structural)
Astronomy & Astrophysics
Publication Status: Published
Article Number: 85
Online Publication Date: 2019-01-24
Appears in Collections:Physics
Astrophysics
Faculty of Natural Sciences



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