Dust in high-z radio-loud AGN

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dc.creatorCimatti, Andrea
dc.creatorFreudling, Wolfram
dc.creatorRoettgering, Huub
dc.creatorIvison, Rob
dc.creatorMazzei, Paola
dc.date1997-08-22
dc.date.accessioned2026-07-07T02:24:03Z
dc.date.available2026-07-07T02:24:03Z
dc.descriptionWe present continuum observations of a small sample of high-redshift, radio-loud AGN (radio galaxies and quasars) aimed at the detection of thermal emission from dust. Seven AGN were observed with IRAM and SEST at 1.25mm; two of them, the radio galaxies 1243+036 ($z \sim 3.6$) and MG1019+0535 ($z \sim 2.8$) were also observed at 0.8mm with the JCMT submillimetre telescope. Additional VLA observations were obtained in order to derive the spectral shape of the synchrotron radiation of MG1019+0535 at high radio frequencies. MG1019+0535 and TX0211$-$122 were expected to contain a large amount of dust based on their depleted Ly$α$ emission. The observations suggest a clear 1.25-mm flux density excess over the synchrotron radiation spectrum of MG1019+0535, suggesting the presence of thermal emission from dust in this radio galaxy, whereas the observations of TX0211$-$122 were not sensitive enough to meaningfully constrain its dust content. On the other hand, our observations of 1243+036 provide a stringent upper limit on the total dust mass of $<10^8$ M$_{\odot}$. Finally, we find that the spectra of the radio-loud quasars in our sample ($2 < z < 4.5$) steepen between rest-frame radio and the far-infrared. We discuss the main implications of our results, concentrating on the dusty radio galaxy, MG1019+0535.
dc.description11 pages, A&A LaTeX, 4 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/9708204
dc.identifierhttp://arxiv.org/abs/astro-ph/9708204
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/11484
dc.subjectAstrophysics
dc.titleDust in high-z radio-loud AGN
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