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Título: | Modeling the Unresolved NIR–MIR SEDs of Local (z < 0.1) QSOs |
Autor: | Martínez-Paredes, M.; González-Martín, Omaira CSIC ORCID CVN; HyeongHan, K.; Geier, S.; García-Bernete, Ismael CSIC ORCID; Ramos-Almeida, Cristina; Alonso-Herrero, A. CSIC ORCID; Aretxaga, Itziar; Kim, M.; Sohn, B. W.; Masegosa, Josefa CSIC ORCID | Fecha de publicación: | 29-nov-2021 | Editor: | IOP Publishing | Citación: | Astrophysical Journal 922(2): 157 (2021) | Resumen: | To study the nuclear (≲1 kpc) dust of nearby (z < 0.1) quasi-stellar objects (QSOs), we obtained new near-infrared (NIR) high angular resolution (∼0.″3) photometry in the H and Ks bands for 13 QSOs with available mid-infrared (MIR) high angular resolution spectroscopy (∼7.5-13.5 μm). We find that in most QSOs, the NIR emission is unresolved. We subtract the contribution from the accretion disk, which decreases from NIR (∼35%) to MIR (∼2.4%). We also estimate these percentages assuming a bluer accretion disk and find that the contribution in the MIR is nearly seven times larger. We find that the majority of objects (64%, 9/13) are better fitted by the disk+wind H17 model, while others can be fitted by the smooth F06 (14%, 2/13), clumpy N08 (7%, 1/13), clumpy H10 (7%, 1/13), and two-phase media S16 (7%, 1/13) models. However, if we assume the bluer accretion disk, the models fit only 2/13 objects. We measured two NIR-to-MIR spectral indexes, α NIR-MIR(1.6-8.7 μm) and α NIR-MIR(2.2-8.7 μm), and two MIR spectral indexes, α MIR(7.8-9.8 μm) and α MIR(9.8-11.7 μm), from models and observations. From observations, we find that the NIR-to-MIR spectral indexes are ∼-1.1, and the MIR spectral indexes are ∼-0.3. Comparing the synthetic and observed values, we find that none of the models simultaneously match the measured NIR-to-MIR and 7.8-9.8 μm slopes. However, we note that measuring α MIR(7.8-9.8 μm) on the starburst-subtracted Spitzer/IRS spectrum gives values of the slopes (∼-2) that are similar to the synthetic values obtained from the models. © 2021. The American Astronomical Society. All rights reserved. | Versión del editor: | http://dx.doi.org/10.3847/1538-4357/ac1d55 | URI: | http://hdl.handle.net/10261/264145 | DOI: | 10.3847/1538-4357/ac1d55 | ISSN: | 0004-637X | E-ISSN: | 1538-4357 |
Aparece en las colecciones: | (IAA) Artículos (CAB) Artículos (IFCA) Artículos |
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2021ApJ...922..157M.pdf | 10,48 MB | Adobe PDF | Visualizar/Abrir |
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