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Showing 1–7 of 7 results
Advanced filters: Author: Ramprasad Rao Clear advanced filters

  • The presence of magnetic fields in protostellar jets has been predicted theoretically, but its experimental confirmation has been elusive so far. Here, the authors report the detection of SiO line polarisation in the HH 211 protostellar jet, indicative of the onset of magnetic fields.

    • Chin-Fei Lee
    • Hsiang-Chih Hwang
    • Paul. T. P Ho
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-7

  • Measurements of polarized 1.25-mm continuum emission from the accretion disk of the T Tauri star HL Tau show that the magnetic field inside the disk cannot be dominated by a vertical component, and that a purely toroidal field also does not fit the data; this suggests that the role of the magnetic field in the accretion of a T Tauri star is more complex than the current theoretical understanding.

    • Ian W. Stephens
    • Leslie W. Looney
    • Ramprasad Rao
    Research
    Nature
    Volume: 514, P: 597-599

  • The accretion geometry of X-ray binary Cygnus X-3 is determined here from IXPE observations. X-ray polarization reveals a narrow funnel with reflecting walls, which focuses emission, making Cyg X-3 appear as an ultraluminous X-ray source.

    • Alexandra Veledina
    • Fabio Muleri
    • Silvia Zane
    Research
    Nature Astronomy
    Volume: 8, P: 1031-1046

  • In June 2022, the IXPE satellite observed a shock passing through the jet of active galaxy Markarian 421. The rotation of the X-ray-polarized radiation over a 5-day period revealed that the jet contains a helical magnetic field.

    • Laura Di Gesu
    • Herman L. Marshall
    • Silvia Zane
    Research
    Nature Astronomy
    Volume: 7, P: 1245-1258

  • The millimetre image of the Centaurus A nucleus by the Event Horizon Telescope reveals a highly collimated, asymmetrically edge-brightened jet. The source’s event horizon shadow should be visible at terahertz frequencies, consistent with the universal scale invariance of black holes.

    • Michael Janssen
    • Heino Falcke
    • Shan-Shan Zhao
    ResearchOpen Access
    Nature Astronomy
    Volume: 5, P: 1017-1028