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ALMA Observations of Warm Molecular Gas and Cold Dust in NGC 34

Xu, C. K. and Cao, C. and Lu, N. and Gao, Y. and van der Werf, P. and Evans, A. S. and Mazzarella, J. M. and Chu, J. and Haan, S. and Díaz-Santos, T. and Meijerink, R. and Zhao, Y.-H. and Appleton, P. and Armus, L. and Charmandaris, V. and Lord, S. and Murphy, E. J. and Sanders, D. B. and Schulz, B. and Stierwalt, S. (2014) ALMA Observations of Warm Molecular Gas and Cold Dust in NGC 34. Astrophysical Journal, 787 (1). Art. No. 48. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20140423-090026252

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Abstract

We present Atacama Large Millimeter Array (ALMA) Cycle-0 observations of the CO (6-5) line emission (rest-frame frequency = 691.473 GHz) and of the 435 μm dust continuum emission in the nuclear region of NGC 34, a local luminous infrared galaxy at a distance of 84 Mpc (1'' = 407 pc) which contains a Seyfert 2 active galactic nucleus (AGN) and a nuclear starburst. The CO emission is well resolved by the ALMA beam (0.''26 × 0.''23), with an integrated flux of f_(CO(6-5)) = 1004 (± 151) Jy km s^(–1). Both the morphology and kinematics of the CO (6-5) emission are rather regular, consistent with a compact rotating disk with a size of 200 pc. A significant emission feature is detected on the redshifted wing of the line profile at the frequency of the H^(13)CN (8-7) line, with an integrated flux of 17.7 ± 2.1(random) ± 2.7(systematic) Jy km s^(–1). However, it cannot be ruled out that the feature is due to an outflow of warm dense gas with a mean velocity of 400 km s^(–1). The continuum is resolved into an elongated configuration, and the observed flux corresponds to a dust mass of M_(dust) = 10^(6.97 ± 0.13) M☉. An unresolved central core (radius ≃50 pc) contributes 28% of the continuum flux and 19% of the CO (6-5) flux, consistent with insignificant contributions of the AGN to both emissions. Both the CO (6-5) and continuum spatial distributions suggest a very high gas column density (≳10^4 M☉ pc^(–2)) in the nuclear region at radius ≾100 pc.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1404.1402arXivDiscussion Paper
http://iopscience.iop.org/0004-637X/787/1/48PublisherArticle
http://dx.doi.org/10.1088/0004-637X/787/1/48DOIArticle
ORCID:
AuthorORCID
Lu, N.0000-0002-8948-1044
van der Werf, P.0000-0001-5434-5942
Mazzarella, J. M.0000-0002-8204-8619
Díaz-Santos, T.0000-0003-0699-6083
Appleton, P.0000-0002-7607-8766
Murphy, E. J.0000-0001-7089-7325
Additional Information:© 2014 American Astronomical Society. Received 2013 November 25; accepted 2014 April 3; published 2014 May 2. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. C.K.X. acknowledges useful discussions with George Privon, Eckard Sturm, Francois Schweizer, and Ximena Fernandez. Kim Scott and Tony Remijan from NAASC are thanked for their help on data reduction. Y.G. is partially supported by NSFC-11173059, NSFC-11390373, and CAS-XDB09000000. 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
National Natural Science Foundation of ChinaCAS-XDB09000000
NSF Jiangsu ProvinceBK2011888
Marie Curie FellowshipPIRSES-GA-2012-316788
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:galaxies: active; galaxies: evolution; galaxies: general; galaxies: interactions; galaxies: starburst; galaxies: Seyfert; submillimeter: galaxies
Record Number:CaltechAUTHORS:20140423-090026252
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140423-090026252
Official Citation:ALMA Observations of Warm Molecular Gas and Cold Dust in NGC 34 C. K. Xu et al. 2014 ApJ 787 48
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45132
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:23 Apr 2014 19:52
Last Modified:25 Oct 2017 19:33

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