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: active

submillimeter: galaxies

galaxies: ISM

galaxies: nuclei

galaxies: interactions

galaxies: starburst

galaxies: magnetic fields

galaxies: general

galaxies: evolution

Författare

C. K. Xu

CalTech

C. F. Cao

CalTech

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

Shandong University, Weihai

N. Lu

CalTech

Y. Gao

Purple Mountain Observatory Chinese Academy of Sciences

T. Diaz-Santos

CalTech

R. Herrero-Illana

CSIC - Instituto de Astrof&amp;iacute;sica de Andaluc&amp;iacute;a (IAA)

R. Meijerink

Universiteit Leiden

G. Privon

University of Virginia

Y. H. Zhao

CalTech

Purple Mountain Observatory Chinese Academy of Sciences

A. S. Evans

National Radio Astronomy Observatory

University of Virginia

Sabine Konig

Institut de RadioAstronomie Millimetrique (IRAM)

J. Mazzarella

CalTech

Susanne Aalto

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

P. Appleton

CalTech

L. Armus

CalTech

V. Charmandaris

National Observatory of Athens

L'Observatoire de Paris

Panepistimio Kritis

J. Chu

University of Hawaii at Manoa

S. Haan

Australia Telescope National Facility

H. Inami

National Optical Astronomy Observatory

E. J. Murphy

CalTech

D. B. Sanders

University of Hawaii at Manoa

B. Schulz

CalTech

P. van der Werf

Universiteit Leiden

Astrophysical Journal

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

Vol. 799

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.1088/0004-637x/799/1/11