LOCAL INSTABILITY SIGNATURES IN ALMA OBSERVATIONS OF DENSE GAS IN NGC 7469
Artikel i vetenskaplig tidskrift, 2015

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 × 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 $\mathcal{Q}$ 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 ~180 pc and the typical sizes of individual complexes of young and massive star clusters seen in high-resolution images.

Författare

K. Fathi

Stockholms universitet

Stockholm Observatory

T. Izumi

University of Tokyo

Alessandro Romeo

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

S. Martin

Institut de RadioAstronomie Millimetrique (IRAM)

M. Imanishi

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

The Graduate University for Advanced Studies (SOKENDAI)

E. Hatziminaoglou

European Southern Observatory (ESO)

Susanne Aalto

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

D. Espada

The Graduate University for Advanced Studies (SOKENDAI)

Atacama Large Millimeter-submillimeter Array (ALMA)

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

K. Kohno

Research Center for the Early Universe

University of Tokyo

Melanie Krips

Institut de RadioAstronomie Millimetrique (IRAM)

S Matsushita

Academia Sinica

D. S. Meier

New Mexico Institute of Mining and Technology

N. Nakai

Faculty of Pure and Applied Sciences

Y. Terashima

Ehime University

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 806 2 L34 (6pp)- L34

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

DOI

10.1088/2041-8205/806/2/L34

Mer information

Senast uppdaterat

2018-04-11