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  Molecular outflows in local galaxies: Method comparison and a role of intermittent AGN driving

Lutz, D., Sturm, E., Jannsen, A. W., Veilleux, S., Aalto, S., Cicone, C., et al. (2020). Molecular outflows in local galaxies: Method comparison and a role of intermittent AGN driving. Astronomy and Astrophysics, 633: A134. doi:10.1051/0004-6361/201936803.

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Lutz, D.1, Author              
Sturm, E.1, Author              
Jannsen, A. W.1, Author              
Veilleux, S., Author
Aalto, S., Author
Cicone, C., Author
Contursi, A.1, Author              
Davies, R. I.1, Author              
Feruglio, C., Author
Fischer, J., Author
Fluetsch, A., Author
Garcia-Burillo, S., Author
Genzel, R.1, Author              
González-Alfonso, E., Author
Graciá-Carpio, J.1, Author              
Herrera-Camus, R.1, Author              
Maiolino, R., Author
Schruba, A.1, Author              
Shimizu, T.1, Author              
Sternberg, A., Author
Tacconi, L. J.1, Author              Weiß, A., Author more..
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: We report new detections and limits from a NOEMA and ALMA CO(1-0) search for molecular outflows in 13 local galaxies with high far-infrared surface brightness, and combine these with local universe CO outflow results from the literature. The CO line ratios and spatial outflow structure of our targets provide some constraints on the conversion steps from observables to physical quantities such as molecular mass outflow rates. Where available, ratios between outflow emission in higher J CO transitions and in CO(1-0) are typically consistent with excitation Ri1 ≲ 1. However, for IRAS 13120−5453, R31 = 2.10 ± 0.29 indicates optically thin CO in the outflow. Like much of the outflow literature, we use αCO(1 − 0) = 0.8, and we present arguments for using C = 1 in deriving molecular mass outflow rates Ṁout = CMoutvout/Rout sources studied with both methods, we find an 80% agreement in detecting vout ≳ 150 km s−1 outflows, and non-matches can be plausibly ascribed to outflow geometry and signal-to-noise ratio. For a published sample of 12 bright ultraluminous infrared galaxies with detailed OH-based outflow modeling, CO outflows are detected in all but one. Outflow masses, velocities, and sizes for these 11 sources agree well between the two methods, and modest remaining differences may relate to the different but overlapping regions sampled by CO emission and OH absorption. Outflow properties correlate better with active galactic nucleus (AGN) luminosity and with bolometric luminosity than with far-infrared surface brightness. The most massive outflows are found for systems with current AGN activity, but significant outflows in nonAGN systems must relate to star formation or to AGN activity in the recent past. We report scaling relations for the increase of outflow mass, rate, momentum rate, and kinetic power with bolometric luminosity. Short flow times of ∼106 yr and some sources with resolved multiple outflow episodes support a role of intermittent driving, likely by AGNs.. We compare the two main methods for molecular outflow detection: CO millimeter interferometry and Herschel OH-based spectroscopic outflow searches. For 26

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 Dates: 2020-01-22
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/201936803
Other: LOCALID: 3309679
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 633 Sequence Number: A134 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1