ALMA observationsof warm dense gas in NGC 1614-breaking of the star formation law in the central kiloparsec
Artikel i vetenskaplig tidskrift, 2015

We present ALMA Cycle-0 observations of the CO (6-5) line emission and of the 435 mu m dust continuum emission in the central kiloparsec of NGC 1614, a local luminous infrared galaxy at a distance of 67.8 Mpc (1 '' = 329 pc). The CO emission is well resolved by the ALMA beam (0.'' 26x0.'' 20) into a circumnuclear ring, with an integrated flux of f(C O(6-5)) = 898 (+/- 153) Jy km s(-1), which is 63(+/- 12)% of the total CO (6-5) flux measured by Herschel. The molecular ring, located between 100 pc < r < 350 pc from the nucleus, looks clumpy and includes seven unresolved (or marginally resolved) knots with median velocity dispersion of similar to 40 km s(-1). These knots are associated with strong star formation regions with Sigma(SFR) similar to 100M(circle dot) yr(-1) kpc(-2) and Sigma(Gas) similar to 10(4) M-circle dot pc(-2). The nondetections of the nucleus in both the CO (6-5) line emission and the 435 mu m continuum rule out, with relatively high confidence, a Compton-thick active galactic nucleus in NGC 1614. Comparisons with radio continuum emission show a strong deviation from an expected local correlation between Sigma(Gas) and Sigma(SFR), indicating a breakdown of the Kennicutt-Schmidt law on the linear scale of similar to 100 pc.

galaxies: evolution

galaxies: active

submillimeter: galaxies

galaxies: magnetic fields

galaxies: nuclei

galaxies: starburst

galaxies: general

galaxies: interactions

galaxies: ISM


C. K. Xu

California Institute of Technology (Caltech)

C. F. Cao

Shandong University

Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment

California Institute of Technology (Caltech)

N. Lu

California Institute of Technology (Caltech)

Y. Gao

Chinese Academy of Sciences

T. Diaz-Santos

California Institute of Technology (Caltech)

R. Herrero-Illana

CSIC - Instituto de Astrofísica de Andalucía (IAA)

R. Meijerink

Universiteit Leiden

G. Privon

University of Virginia

Y. H. Zhao

California Institute of Technology (Caltech)

Chinese Academy of Sciences

A. S. Evans

National Radio Astronomy Observatory

University of Virginia

Sabine Konig

Institut de RadioAstronomie Millimetrique (IRAM)

J. Mazzarella

California Institute of Technology (Caltech)

Susanne Aalto

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

P. Appleton

California Institute of Technology (Caltech)

L. Armus

California Institute of Technology (Caltech)

V. Charmandaris

L'Observatoire de Paris

National Observatory of Athens

Panepistimio Kritis

J. Chu

University of Hawaii

S. Haan

Australia Telescope National Facility

H. Inami

National Optical Astronomy Observatory

E. J. Murphy

California Institute of Technology (Caltech)

D. B. Sanders

University of Hawaii

B. Schulz

California Institute of Technology (Caltech)

P. van der Werf

Universiteit Leiden

Astrophysical Journal

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

Vol. 799 1


Astronomi, astrofysik och kosmologi



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