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Song, Y.; Linden, S. T.; Evans, A. S.; Barcos-Muñoz, L.; Murphy, E. J.; Momjian, E.; Díaz-Santos, T.; Larson, K. L.; Privon, G. C.; Huang, X.; Armus, L.; Mazzarella, J. M.; U, V.; Inami, H.; Charmandaris, V.; Ricci, C.; Emig, K. L.; McKinney, J.; Yoon, I.; Kunneriath, D.; Lai, T. S.-Y.; Rodas-Quito, E. E.; Saravia, A.; Gao, T.; Meynardie, W.; Sanders, D. B.
The Astrophysical journal, 11/2022, Letnik: 940, Številka: 1Journal Article
Abstract We present the analysis of ∼100 pc scale compact radio continuum sources detected in 63 local (ultra)luminous infrared galaxies (U/LIRGs; L IR ≥ 10 11 L ⊙ ), using FWHM ≲ 0.″1–0.″2 resolution 15 and 33 GHz observations with the Karl G. Jansky Very Large Array. We identify a total of 133 compact radio sources with effective radii of 8–170 pc, which are classified into four main categories—“AGN” (active galactic nuclei), “AGN/SBnuc” (AGN-starburst composite nucleus), “SBnuc” (starburst nucleus), and “SF” (star-forming clumps)—based on ancillary data sets and the literature. We find that “AGN” and “AGN/SBnuc” more frequently occur in late-stage mergers and have up to 3 dex higher 33 GHz luminosities and surface densities compared with “SBnuc” and “SF,” which may be attributed to extreme nuclear starburst and/or AGN activity in the former. Star formation rates (SFRs) and surface densities (Σ SFR ) are measured for “SF” and “SBnuc” using both the total 33 GHz continuum emission (SFR ∼ 0.14–13 M ⊙ yr −1 , Σ SFR ∼ 13–1600 M ⊙ yr −1 kpc −2 ) and the thermal free–free emission from H ii regions (median SFR th ∼ 0.4 M ⊙ yr −1 , Σ SFR th ∼ 44 M ⊙ yr −1 kpc −2 ). These values are 1–2 dex higher than those measured for similar-sized clumps in nearby normal (non-U/LIRGs). The latter also have a much flatter median 15–33 GHz spectral index (∼−0.08) compared with “SBnuc” and “SF” (∼−0.46), which may reflect higher nonthermal contribution from supernovae and/or interstellar medium densities in local U/LIRGs that directly result from and/or lead to their extreme star-forming activities on 100 pc scales.
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