The Heating Mechanism for the Warm/Cool Dust in Powerful, Radio-loud Active Galactic Nuclei
| العنوان: | The Heating Mechanism for the Warm/Cool Dust in Powerful, Radio-loud Active Galactic Nuclei |
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| المؤلفون: | I. M. van Bemmel, D. Dicken, R. M. González Delgado, Katherine J. Inskip, Catherine L. Buchanan, Peter Barthel, Clive Tadhunter, J. Holt, David Axon, R. Morganti |
| المساهمون: | Kapteyn Astronomical Institute, Astronomy |
| المصدر: | Astrophysical Journal, 661(1), L13-L16. IOP PUBLISHING LTD |
| بيانات النشر: | American Astronomical Society, 2007. |
| سنة النشر: | 2007 |
| مصطلحات موضوعية: | Active galactic nucleus, Infrared, Radio galaxy, galaxies : active, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, ENERGY-DISTRIBUTIONS, Galaxy formation and evolution, Astrophysics::Solar and Stellar Astrophysics, BLACK-HOLES, Astrophysics::Galaxy Astrophysics, Physics, quasars : general, SPECTROSCOPY, infrared : galaxies, Star formation, Astronomy and Astrophysics, Quasar, INFRARED PROPERTIES, EVOLUTION, Redshift, Galaxy, HOST GALAXIES, QUASARS, Space and Planetary Science, COMPLETE SAMPLE, Astrophysics::Earth and Planetary Astrophysics, SUBMILLIMETER, EMISSION |
| الوصف: | The uncertainty surrounding the nature of the heating mechanism for the dust that emits at mid- to far-IR (MFIR) wavelengths in active galaxies limits our understanding of the links between active galactic nuclei (AGN) and galaxy evolution, as well as our ability to interpret the prodigious infrared and sub-mm emission of some of the most distant galaxies in the Universe. Here we report deep Spitzer observations of a complete sample of powerful, intermediate redshift (0.05 < z < 0.7) radio galaxies and quasars. We show that AGN power, as traced by [OIII]5007 emission, is strongly correlated with both the mid-IR (24 micron) and the far-IR (70 micron) luminosities, however, with increased scatter in the 70 micron correlation. A major cause of this increased scatter is a group of objects that falls above the main correlation and displays evidence for prodigious recent star formation activity at optical wavelengths, along with relatively cool MFIR colours. These results provide evidence that illumination by the AGN is the primary heating mechanism for the dust emitting at both 24 and 70 microns, with starbursts dominating the heating of the cool dust in only 20 -- 30% of objects. This implies that powerful AGN are not always accompanied by the type of luminous starbursts that are characteristic of the peak of activity in major gas-rich mergers. |
| تدمد: | 1538-4357 0004-637X |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9d1040152fd2c26a5303c9ce3f1fa973 https://doi.org/10.1086/518421 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....9d1040152fd2c26a5303c9ce3f1fa973 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15384357 0004637X |
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