1999/02/09 by Ilse M. van Bemmel, Ilse van Bemmel, P. D. Barthel +5
Physics and Astronomy · #Astro and Planetary Science #Astrophysics (astro-ph) #FOS: Physical sciences #Nuclear physics research studies #Quantum, superfluid, helium dynamics #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9902143
4 pages including 1 figure, to be published in the proceedings of ESA conference 'The Universe as seen by ISO', ed. M. Kessler (ESA Special Publications series SP-427)
arxiv created 1999/02/09 · openalex publication_date 1999/02/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In order to test the unification scheme for double-lobed radio sources, the far-infrared properties of matched samples of radio-galaxies and radio-loud quasars were studied using ISOPHOT. The quasar data were complemented with nearly simultaneous submillimeter and centimeter radio data. The results show that quasars are generally brighter than radio-galaxies in their far-infrared output and that beamed non-thermal radiation must be excluded as source for this infrared excess. However, non-thermal flares or optically thick tori can still reconcile these results with the unification scheme.