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Título: | Detection and mapping of decoupled stellar and ionized gas structures in the ultraluminous infrared galaxy IRAS 12112+0305 |
Autor: | Colina, Luis CSIC ORCID; Arribas-Mocoroa, Santiago CSIC ORCID ; Borne, Kirk D.; Monreal-Ibero, Ana CSIC ORCID | Palabras clave: | Galaxies: active Galaxies: individual (IRAS 1211210305) Galaxies: interactions Galaxies: nuclei Galaxies: starburst |
Fecha de publicación: | 10-abr-2000 | Editor: | IOP Publishing | Citación: | Astrophysical Journal Letters 533(1): L9- L12 (2000) | Resumen: | Integral field optical spectroscopy with the INTEGRAL fiber-fed system and Hubble Space Telescope optical imaging are used to map the complex stellar and warm ionized gas structure in the ultraluminous infrared galaxy IRAS 12112+0305. Images reconstructed from wavelength-delimited extractions of the integral field spectra reveal that the observed ionized gas distribution is decoupled from the stellar main body of the galaxy, with the dominant continuum and emission-line regions separated by projected distances of up to 7.5 kpc. The two optical nuclei are detected as apparently faint emission-line regions, and their optical properties are consistent with being dust-enshrouded weak [O I] LINERs. The brightest emission-line region is associated with a faint (m1 = 20.4), giant H II region of 600 pc diameter, in which a young (∼5 Myr) massive cluster of about 2 × 107 M⊙ dominates the ionization. Internal reddening toward the line-emitting regions and the optical nuclei ranges from 1 to 8 mag in the visual. Taking the reddening into account, the overall star formation in IRAS 12112+0305 is dominated by starbursts associated with the two nuclei and corresponds to a star formation rate of 80 M⊙ yr-1. | Versión del editor: | http://dx.doi.org/10.1086/312590 | URI: | http://hdl.handle.net/10261/199146 | DOI: | 10.1086/312590 | Identificadores: | doi: 10.1086/312590 issn: 2041-8205 e-issn: 2041-8213 |
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Detection_mapping.pdf | 261,9 kB | Adobe PDF | Visualizar/Abrir |
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