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http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1522| Blast: the far-infrared/radio correlation in distant galaxies | |
| David Hughes | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| Galaxies: evolution Infrared: galaxies Radio continuum: galaxies | |
| We investigate the correlation between far-infrared (FIR) and radio luminosities in distant galaxies, a lynchpin of modern astronomy. We use data from the Balloon-borne Large Aperture Submillimetre Telescope (BLAST), Spitzer, the Large Apex BOlometer CamerA (LABOCA), the Very Large Array (VLA) and the Giant Metre-wave Radio Telescope (GMRT) in the Extended Chandra Deep Field South (ECDFS). For a catalogue of BLAST 250-μm-selected galaxies, we re-measure the 70–870-μm flux densities at the positions of their most likely 24-μm counterparts, which have a median [interquartile] redshift of 0.74 [0.25, 1.57]. From these, we determine the monochromatic flux density ratio, q₂₅₀ (= log₁₀ [S₂₅₀μm/S₁‚₄₀₀MHz]), and the bolometric equivalent, q🇮🇷. At z ≈ 0.6, where our 250-μm filter probes rest-frame 160-μm emission, we find no evolution relative to q₁₆₀ for local galaxies. We also stack the FIR and submm images at the positions of 24-μm- and radio-selected galaxies. The difference between q🇮🇷 seen for 250-μm- and radio-selected galaxies suggests star formation provides most of the IR luminosity in ≲100-μJy radio galaxies, but rather less for those in the mJy regime. For the 24-μm sample, the radio spectral index is constant across 0 < z < 3, but q🇮🇷 exhibits tentative evidence of a steady decline such that q🇮🇷 ∝ (1 + z)⁻⁰͘¹⁵⁺⁻⁰͘⁰³ – significant evolution, spanning the epoch of galaxy formation, with major implications for techniques that rely on the FIR/radio correlation. We compare with model predictions and speculate that we may be seeing the increase in radio activity that gives rise to the radio background. | |
| Monthly Notices of the Royal Astronomical Society | |
| 2010 | |
| Artículo | |
| Inglés | |
| Estudiantes Investigadores Público en general | |
| Ivison, R. J., et al., (2010), Blast: the far-infrared/radio correlation in distant galaxies, Monthly Notices of the Royal Astronomical Society, Vol. 402(1): 245-258 | |
| ASTRONOMÍA Y ASTROFÍSICA | |
| Versión aceptada | |
| acceptedVersion - Versión aceptada | |
| Aparece en las colecciones: | Artículos de Astrofísica |
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