Radio Galaxy Zoo Talk

A Search for double-lobed radio emission from Galactic Stars and Spiral Galaxies

  • zutopian by zutopian

    A Search for double-lobed radio emission from Galactic Stars and Spiral Galaxies
    Abiel Felipe Ortiz Martínez, Heinz Andernach

    We present a systematic search for two types of very unusual astronomical objects: Galactic stars and spiral galaxies with double radio lobes, i.e. radio emission on opposite sides of the optical object, suggesting the ejection of jets from them. We designed an algorithm to search for pairs of radio sources straddling objects from two unprecedented samples of 878,031 Galactic stars from the Sloan Digital Sky Survey and 675,874 spiral galaxy candidates drawn from the recent literature. We found three new examples of double-lobed radio stars, while for the spiral galaxies we only rediscovered one known such double source, confirming that the latter objects are extremely rare.

    (Submitted on 8 Oct 2016)
    https://arxiv.org/abs/1610.02572

    PS: H. Andernach is co-author!

    Posted

  • zutopian by zutopian

    Subsequent paper:

    A Further Search for Galactic Stars with Double Radio Lobes

    Braulio Arredondo Padilla, Heinz Andernach

    Over a thousand stars in our Galaxy have been detected as radio emitters, but no normal stars are known to possess radio-emitting lobes similar to radio galaxies. Several recent attempts by us and other authors to find such objects remained inconclusive. Here we present a further search for double-lobed radio stars in two large samples of spectroscopic stars: over 20,000 white dwarves from the Sloan Digital Sky Survey (SDSS) DR12, and 2.5 million stars from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). These were cross-matched with sources from the Faint Images of the Radio Sky at Twenty Centimeters (FIRST) survey at 1.4 GHz to look for source pairs straddling the stars with moderate symmetry about the stars. We found only four promising candidates for double-lobed radio stars, confirming they must be extremely rare. By comparison with SDSS, we inferred that about 16 per cent of LAMOST spectra may have erroneous classifications. We also rediscovered the giant radio galaxy J0927+3510 and propose a different, more distant host, suggesting a much larger radio size of 2.7 Mpc.

    (Submitted on 8 Dec 2017)
    https://arxiv.org/abs/1712.02920

    Posted