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ALMA Observations of Warm Dense Gas in NGC 1614 — Breaking of Star Formation Law in the Central kpc

Xu, C. K. and Cao, C. and Lu, N. and Gao, Y. and Díaz-Santos, T. and Herrero-Illana, R. and Meijerink, R. and Privon, G. and Zhao, Y.-H. and Evans, A. S. and König, S. and Mazzarella, J. M. and Aalto, S. and Appleton, P. and Armus, L. and Charmandaris, V. and Chu, J. and Haan, S. and Inami, H. and Murphy, E. J. and Sanders, D. B. and Schulz, B. and van der Werf, P. (2015) ALMA Observations of Warm Dense Gas in NGC 1614 — Breaking of Star Formation Law in the Central kpc. Astrophysical Journal, 799 (1). Art. No. 11. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20141117-110446868

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Abstract

We present ALMA Cycle-0 observations of the CO (6-5) line emission and of the 435 μm dust continuum emission in the central kpc of NGC 1614, a local luminous infrared galaxy (LIRG) at a distance of 67.8 Mpc (1" = 329 pc). The CO emission is well resolved by the ALMA beam (0."26×0."20) into a circum-nuclear ring, with an integrated flux of f_(CO (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 ∼ 40 km s^(-1). These knots are associated with strong star formation regions with Σ_(SFR) ∼ 100 M_⊙ yr^(-1) kpc^(-2) and Σ_(Gas) ∼ 10^4 M_⊙ pc^(-2). The non-detections of the nucleus in both the CO (6-5) line emission and the 435 μm continuum rule out, with relatively high confidence, a Compton-thick AGN in NGC 1614. Comparisons with radio continuum emission show a strong deviation from an expected local correlation between Σ_(Gas) and Σ_(SFR), indicating a breakdown of the Kennicutt-Schmidt law on the linear scale of ∼100 pc.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/799/1/11DOIArticle
http://iopscience.iop.org/0004-637X/799/1/11PublisherArticle
http://arxiv.org/abs/1411.1111arXivDiscussion Paper
ORCID:
AuthorORCID
Lu, N.0000-0002-8948-1044
Díaz-Santos, T.0000-0003-0699-6083
Privon, G.0000-0003-3474-1125
Mazzarella, J. M.0000-0002-8204-8619
Appleton, P.0000-0002-7607-8766
Murphy, E. J.0000-0001-7089-7325
van der Werf, P.0000-0001-5434-5942
Additional Information:© 2015 The American Astronomical Society. Received 2014 September 2; accepted 2014 November 4; published 2015 January 12. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. We thank Adam Leroy and Tony Remijan from NAASC for their help with data reduction. We thank an anonymous referee for constructive comments. Y.G. is partially supported by NSFC-11173059, NSFC-11390373, and CASXDB09000000. Y.Z. thanks the NSF of Jiangsu Province for partial support under grant BK2011888. V.C. acknowledges partial support from the EU FP7 grant PIRSES-GA-2012- 316788. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2011.0.00182.S. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. This research has made extensive use of the NASA/ IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China11173059
National Natural Science Foundation of China11390373
Chinese Academy of SciencesXDB09000000
National Science Foundation of Jiangsu ProvinceBK2011888
Marie Curie FellowshipPIRSES-GA-2012-316788
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:galaxies: interactions, galaxies: evolution—galaxies: starburst, galaxies: general
Record Number:CaltechAUTHORS:20141117-110446868
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141117-110446868
Official Citation:ALMA Observations of Warm Dense Gas in NGC 1614—Breaking of the Star Formation Law in the Central Kiloparsec C. K. Xu et al. 2015 ApJ 799 11
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51844
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:17 Nov 2014 20:16
Last Modified:02 Nov 2017 21:12

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