Projekteja vuodessa
Abstrakti
Understanding the formation of relativistic jets in active galactic nuclei remains an elusive problem 1 .This is partly because observational tests of jet formation models suffer from the limited angular resolution of ground-based very-long-baseline interferometry that has thus far been able to probe the structure of the jet acceleration and collimation region in only two sources 2,3 . Here, we report observations of 3C84 (NGC 1275)-the central galaxy of the Perseus cluster-made with an interferometric array including the orbiting radio telescope of the RadioAstron 4 mission. The data transversely resolve the edge-brightened jet in 3C84 only 30 μas from the core, which is ten times closer to the central engine than was possible in previous ground-based observations 5 and allows us to measure the jet collimation profile from ~102 to ~104 gravitational radii (r g) from the black hole. The previously found 5, almost cylindrical jet profile on scales larger than a few thousand r g is seen to continue at least down to a few hundred r g from the black hole, and we find a broad jet with a transverse radius of â‰250 r g at only 350 r g from the core. This implies that either the bright outer jet layer goes through a very rapid lateral expansion on scales â‰102 r g or it is launched from the accretion disk.
Alkuperäiskieli | Englanti |
---|---|
Sivut | 472-477 |
Sivumäärä | 6 |
Julkaisu | Nature Astronomy |
Vuosikerta | 2 |
Numero | 6 |
DOI - pysyväislinkit | |
Tila | Julkaistu - 1 kesäk. 2018 |
OKM-julkaisutyyppi | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä |
Sormenjälki
Sukella tutkimusaiheisiin 'A wide and collimated radio jet in 3C84 on the scale of a few hundred gravitational radii'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.Projektit
- 2 Päättynyt
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Mustien aukkojen suihkut ja niiden fysiikka
Savolainen, T. (Vastuullinen tutkija)
01/09/2014 → 31/08/2019
Projekti: Academy of Finland: Other research funding
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Mustien aukkojen suihkut ja niiden fysiikka
Chamani Velasco, W. (Projektin jäsen), Savolainen, T. (Vastuullinen tutkija) & Kiehlmann, S. (Projektin jäsen)
01/09/2014 → 31/12/2015
Projekti: Academy of Finland: Other research funding
Laitteet
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Metsähovin radiotutkimusasema
Tammi, J. (Manager)
Sähkötekniikan korkeakouluLaitteistot/tilat: Facility