Spatially resolved cold molecular outflows in ULIRGs

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Spatially resolved cold molecular outflows in ULIRGs

Pereira-Santaella, M. (författare): University Of Oxford

Colina, L. (författare): Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council

Garcia-Burillo, S. (författare): Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)

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Combes, F. (författare)

Emonts, B. (författare): National Radio Astronomy Observatory

Aalto, Susanne, 1964 (författare): Chalmers tekniska högskola,Chalmers University of Technology

Alonso-Herrero, A. (författare): Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council

Arribas, S. (författare): Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council

Henkel, C. (författare): Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),King Abdulaziz University

Labiano, A. (författare): Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council

Muller, Sebastien, 1976 (författare): Chalmers tekniska högskola,Chalmers University of Technology

Piqueras Lopez, J. (författare): Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council

Rigopoulou, D. (författare): University Of Oxford

van der Werf, P. (författare): Universiteit Leiden (UL),Leiden University (UL)

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2018-08-31
2018
Engelska.
Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 616

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Tidskriftsartikel (refereegranskat)

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We present new CO(2-1) observations of three low-z (d similar to 350 Mpc) ultra-luminous infrared galaxy (ULIRG) systems (six nuclei) observed with the Atacama large millimeter/submillimeter array (ALMA) at high spatial resolution (similar to 500 pc). We detect massive cold molecular gas outflows in five out of six nuclei (M-out - (0.3-5) x 10(8) M-circle dot). These outflows are spatially resolved with deprojected effective radii between 250 pc and 1 kpc although high-velocity molecular gas is detected up to R-max similar to 0.5-1.8 kpc (1-6 kpc deprojected). The mass outflow rates are 12-400 M circle dot yr(-1) and the inclination corrected average velocity of the outflowing gas is 350-550 km s(-1) (v(max) = 500-900 km s(-1)). The origin of these outflows can be explained by the strong nuclear starbursts although the contribution of an obscured active galactic nucleus cannot be completely ruled out. The position angle (PA) of the outflowing gas along the kinematic minor axis of the nuclear molecular disk suggests that the outflow axis is perpendicular to the disk for three of these outflows. Only in one case is the outflow PA clearly not along the kinematic minor axis, which might indicate a different outflow geometry. The outflow depletion times are 15-80 Myr. These are comparable to, although slightly shorter than, the star-formation (SF) depletion times (30-80 Myr). However, we estimate that only 15-30% of the outflowing molecular gas will escape the gravitational potential of the nucleus. The majority of the outflowing gas will return to the disk after 5-10 Myr and become available to form new stars. Therefore, these outflows will not likely completely quench the nuclear starbursts. These star-forming powered molecular outflows would be consistent with being driven by radiation pressure from young stars (i.e., momentum-driven) only if the coupling between radiation and dust increases with increasing SF rates. This can be achieved if the dust optical depth is higher in objects with higher SF. This is the case in at least one of the studied objects. Alternatively, if the outflows are mainly driven by supernovae (SNe), the coupling efficiency between the interstellar medium and SNe must increase with increasing SF levels. The relatively small sizes (<1 kpc) and dynamical times (<3 Myr) of the cold molecular outflows suggests that molecular gas cannot survive longer in the outflow environment or that it cannot form efficiently beyond these distances or times. In addition, the ionized and hot molecular phases have been detected for several of these outflows, so this suggests that outflowing gas can experience phase changes and indicates that the outflowing gas is intrinsically multiphase, likely sharing similar kinematics, but different mass and, therefore, different energy and momentum contributions.

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Av författaren/redakt...: Pereira-Santaell ...; Colina, L.; Garcia-Burillo, ...; Combes, F.; Emonts, B.; Aalto, Susanne, ...; visa fler...; Alonso-Herrero, ...; Arribas, S.; Henkel, C.; Labiano, A.; Muller, Sebastie ...; Piqueras Lopez, ...; Rigopoulou, D.; van der Werf, P.; visa färre...

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Av lärosätet: Chalmers tekniska högskola

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Spatially resolved cold molecular outflows in ULIRGs

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