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Event Horizon Telescope observations of the jet launching and collimation in Centaurus A

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Event Horizon Telescope observations of the jet launching and collimation in Centaurus A

dc.contributor.author	Janssen, Michael
dc.contributor.author	EHT Collaboration
dc.contributor.author	Azulay Romero, Rebecca Sarah
dc.contributor.author	Martí Vidal, Iván
dc.contributor.author	Mus, Alejandro
dc.date.accessioned	2022-05-24T14:30:55Z
dc.date.available	2022-05-24T14:30:55Z
dc.date.issued	2021
dc.identifier.citation	Janssen, Michael EHT Collaboration Azulay Romero, Rebecca Sarah Martí Vidal, Iván Mus, Alejandro 2021 Event Horizon Telescope observations of the jet launching and collimation in Centaurus A Nature Astronomy 5 1017 1028
dc.identifier.uri	https://hdl.handle.net/10550/82968
dc.description.abstract	Very-long-baseline interferometry (VLBI) observations of active galactic nuclei at millimetre wavelengths have the power to reveal the launching and initial collimation region of extragalactic radio jets, down to 10-100 gravitational radii (rg = GM/c2) scales in nearby sources. Centaurus A is the closest radio-loud source to Earth. It bridges the gap in mass and accretion rate between the supermassive black holes (SMBHs) in Messier 87 and our Galactic Centre. A large southern declination of −43deg has, however, prevented VLBI imaging of Centaurus A below a wavelength of 1 cm thus far. Here we show the millimetre VLBI image of the source, which we obtained with the Event Horizon Telescope at 228 GHz. Compared with previous observations, we image the jet of Centaurus A at a tenfold higher frequency and sixteen times sharper resolution and thereby probe sub-lightday structures. We reveal a highly collimated, asymmetrically edge-brightened jet as well as the fainter counterjet. We find that the source structure of Centaurus A resembles the jet in Messier 87 on ~500 rg scales remarkably well. Furthermore, we identify the location of Centaurus A's SMBH with respect to its resolved jet core at a wavelength of 1.3 mm and conclude that the source's event horizon shadow4 should be visible at terahertz frequencies. This location further supports the universal scale invariance of black holes over a wide range of masses.
dc.language.iso	eng
dc.relation.ispartof	Nature Astronomy, 2021, vol. 5, p. 1017-1028
dc.subject	Astrofísica
dc.subject	Astronomia Observacions
dc.title	Event Horizon Telescope observations of the jet launching and collimation in Centaurus A
dc.type	journal article	es_ES
dc.date.updated	2022-05-24T14:30:56Z
dc.identifier.doi	10.1038/s41550-021-01417-w
dc.identifier.idgrec	153675
dc.rights.accessRights	open access	es_ES