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Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 14
2015 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, Vol. 806, no 2, L34Article in journal (Refereed) Published
Abstract [en]

We present an unprecedented measurement of the disk stability and local instability scales in the luminous infrared Seyfert 1 host, NGC 7469, based on ALMA observations of dense gas tracers and with a synthesized beam of 165 x 132 pc. While we confirm that non-circular motions are not significant in redistributing the dense interstellar gas in this galaxy, we find compelling evidence that the dense gas is a suitable tracer for studying the origin of its intensely high-mass star-forming ringlike structure. Our derived disk stability parameter Q accounts for a thick disk structure, and its value falls below unity at the radii in which intense star formation is found. Furthermore, we derive the characteristic instability scale lambda(c) and find a striking agreement between our measured scale of similar to 180 pc and the typical sizes of individual complexes of young and massive star clusters seen in high-resolution images.

Place, publisher, year, edition, pages
2015. Vol. 806, no 2, L34
Keyword [en]
galaxies: individual (NGC 7469), galaxies: ISM, galaxies: kinematics and dynamics
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-118945DOI: 10.1088/2041-8205/806/2/L34ISI: 000356772700013OAI: diva2:842978
Available from: 2015-07-24 Created: 2015-07-21 Last updated: 2015-07-24Bibliographically approved

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