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A Comparison between Nuclear Ring Star Formation in LIRGs and in Normal Galaxies with the Very Large Array

Song, Y. and Linden, S. T. and Evans, A. S. and Barcos-Muñoz, L. and Privon, G. C. and Yoon, I. and Murphy, E. J. and Larson, K. L. and Díaz-Santos, T. and Armus, L. and Mazzarella, Joseph M. and Howell, J. and Inami, H. and Torres-Albà, N. and U, V. and Charmandaris, V. and McKinney, J. and Kunneriath, D. and Momijian, E. (2021) A Comparison between Nuclear Ring Star Formation in LIRGs and in Normal Galaxies with the Very Large Array. Astrophysical Journal, 916 (2). Art. No. 73. ISSN 0004-637X. doi:10.3847/1538-4357/ac05c2.

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Nuclear rings are excellent laboratories for studying intense star formation. We present results from a study of nuclear star-forming rings in five nearby normal galaxies from the Star Formation in Radio Survey (SFRS) and four local LIRGs from the Great Observatories All-sky LIRG Survey at sub-kiloparsec resolutions using Very Large Array high-frequency radio continuum observations. We find that nuclear ring star formation (NRSF) contributes 49%–60% of the total star formation of the LIRGs, compared to 7%–40% for the normal galaxies. We characterize a total of 57 individual star-forming regions in these rings, and find that with measured sizes of 10–200 pc, NRSF regions in the LIRGs have star formation rate (SFR) and Σ_(SFR) up to 1.7 M_⊙ yr⁻¹ and 402 M_⊙ yr⁻¹ kpc⁻², respectively, which are about 10 times higher than in NRSF regions in the normal galaxies with similar sizes, and comparable to lensed high-z star-forming regions. At ~100–300 pc scales, we estimate low contributions (<50%) of thermal free–free emission to total radio continuum emission at 33 GHz in the NRSF regions in the LIRGs, but large variations possibly exist at smaller physical scales. Finally, using archival sub-kiloparsec resolution CO (J = 1–0) data of nuclear rings in the normal galaxies and NGC 7469 (LIRG), we find a large scatter in gas depletion times at similar molecular gas surface densities, which tentatively points to a multimodal star formation relation on sub-kiloparsec scales.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Song, Y.0000-0002-3139-3041
Linden, S. T.0000-0002-1000-6081
Evans, A. S.0000-0003-2638-1334
Barcos-Muñoz, L.0000-0003-0057-8892
Privon, G. C.0000-0003-3474-1125
Yoon, I.0000-0001-9163-0064
Murphy, E. J.0000-0001-7089-7325
Larson, K. L.0000-0003-3917-6460
Díaz-Santos, T.0000-0003-0699-6083
Armus, L.0000-0003-3498-2973
Mazzarella, Joseph M.0000-0002-8204-8619
Howell, J.0000-0001-6028-8059
Inami, H.0000-0003-4268-0393
Torres-Albà, N.0000-0003-3638-8943
U, V.0000-0002-1912-0024
Charmandaris, V.0000-0002-2688-1956
McKinney, J.0000-0002-6149-8178
Kunneriath, D.0000-0002-1568-579X
Momijian, E.0000-0003-3168-5922
Additional Information:© 2021. The American Astronomical Society. Received 2021 February 11; revised 2021 May 21; accepted 2021 May 25; published 2021 July 29. We thank the anonymous reviewer for providing detailed and constructive feedback that significantly improved this manuscript. We also thank M. de los Reyes for sharing data points from Kennicutt & de los Reyes (2021), and V. Casasola and S. Ishizuki for making their data for NGC 4826 and IC 342 available online. Y.S. thanks the staff at National Radio Astronomy Observatory for providing valuable guidance on ALMA data reduction, and Alejandro Saravia, Eduardo Rodas-Quito, and William Meynardie for helpful discussions. A.S.E. and Y.S. were supported by NSF grant AST 1816838. Y.S. and S.T.L. acknowledge support by the NRAO Grote Reber Dissertation Fellowship. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities Inc. A.S.E. was also supported by the Taiwan, ROC, Ministry of Science and Technology grant MoST 102-2119-M-001-MY3. H.I. acknowledges support from JSPS KAKENHI Grant No. JP21H01129. V.U acknowledges support from the NASA Astrophysics Data Analysis Program (ADAP) grant 80NSSC20K0450. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is funded by the National Aeronautics and Space Administration and operated by the California Institute of Technology. This research has also made use of NASA's Astrophysics Data System. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2012.1.00001.S, ADS/JAO.ALMA#2013.1.00885.S, ADS/JAO.ALMA#2015.1.00978.S, ADS/JAO.ALMA#2016.1.00972.S, ADS/JAO.ALMA#2013.1.00218.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. Facilities: VLA(NRAO) - Very Large Array, ALMA(NRAO) - , NASA/IPAC Extragalactic Database (NED) - , NASA's Astrophysics Data System. - Software: Ned Wright's Cosmology Calculator (Wright 2006), Astropy (Astropy Collaboration et al. 2013; Price-Whelan et al. 2018), Astrodendro (, CASA (McMullin et al. 2007).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
National Radio Astronomy ObservatoryUNSPECIFIED
Ministry of Science and Technology (Taipei)MoST 102-2119-M-001-MY3
Japan Society for the Promotion of Science (JSPS)JP21H01129
Subject Keywords:Star forming regions; Luminous infrared galaxies; Galaxy structure; Radio continuum emission; Galaxy nuclei
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Star forming regions (1565); Luminous infrared galaxies (946); Galaxy structure (622); Radio continuum emission (1340); Galaxy nuclei (609)
Record Number:CaltechAUTHORS:20210813-181156671
Persistent URL:
Official Citation:Y. Song et al 2021 ApJ 916 73
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:110241
Deposited By: George Porter
Deposited On:16 Aug 2021 17:13
Last Modified:16 Aug 2021 17:13

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